subject:(Dissolved organic carbon)

University of Waikato

1. Chibnall, Emma Jayne. Contribution of Dissolved Organic Carbon Leaching to the Annual Carbon Budget of a Dairy Farm .

Degree: 2013, University of Waikato

URL: http://hdl.handle.net/10289/7853

► Soils are the largest terrestrial store of carbon (C) and changes in this store of C can impact on soil quality and atmospheric CO2 concentrations.… (more)

▼ Soils are the largest terrestrial store of carbon (C) and changes in this store of C can impact on soil quality and atmospheric CO2 concentrations. Research on C budgets at paddock to national scales has focused most attention on the processes of respiration and photosynthesis in determining the net loss or gain of carbon from an ecosystem. However, leaching of dissolved organic carbon (DOC) is a potentially important component of the carbon budget that is rarely measured when developing carbon budgets, and as a consequence, is often estimated or excluded. Much of the literature indicates that while DOC leaching is important, the loss of DOC from the terrestrial ecosystem may only be small. In the vasose zone DOC that is leached may be adsorbed on to soil and stabilised or may be mineralised, effectively preventing it from leaching from the ecosystem. The objectives of this thesis were to determine if DOC leaching from the soil of a dairy farm was an important contribution to the carbon budget. To measure this, soil leachate was collected from five paddocks using 100 suction cup lysimeters. These were installed within the footprints of two eddy covariance towers on a dairy farm in Waharoa, Waikato, New Zealand. In general samples were bulked over paddocks, with 10 mL of water from each suction cup contributing to the overall bulked sample. Water extracted from the suction cups was analysed for DOC, total nitrogen, and nitrate. DOC concentration measurements were coupled to the volume of water draining through the soil. The volume of drainage was obtained from a water balance model using measurements of evaporation and precipitation. Leaching from the soil started in mid-May continuing through till mid-November. The total amount of water draining through the soil for the year was calculated to be 990 mm, with a mean concentration of 4.5 ± 0.8 mg L-1 (mean ± SE). The mass of DOC leached was 38 ± 4 kg C ha-1 yr-1 (mean ± SE). The concentration of DOC showed no monthly variation, while the mass of DOC showed a strong seasonal trend, with the greatest mass of DOC leaching during the wet winter period. Ultimately the main driver of DOC leaching at this site was the volume of water draining through the soil, because DOC concentration changed very little. In order to understand the suite of processes that influence the fate of DOC the subsoil, internal cycling process including mineralisation and sorption of DOC were investigated in the laboratory. Results showed that DOC leached to a depth of 0.65 m could be mineralised by soil microbes lower in the profile, converting it to CO2. The total C respired over a week (12.81 µg CO2-C-1 g soil-1) was 11 times greater than the C added (1.18 µg C-1 g soil-1). In a repeat of the same study the amount of CO2 respired was 25 times greater than the addition of DOC. Additionally sorption experiments indicated that the concentration of DOC lost to the groundwater would be less than the concentration of DOC measured at 0.65 m. Soil water solution with a concentration of 7 mg L-1 DOC… Advisors/Committee Members: Schipper, Louis A (advisor), Campbell, David I (advisor).

Subjects/Keywords: Dissolved Organic Carbon; Leaching; Pasture

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APA (6^th Edition):

Chibnall, E. J. (2013). Contribution of Dissolved Organic Carbon Leaching to the Annual Carbon Budget of a Dairy Farm . (Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/7853

Chicago Manual of Style (16^th Edition):

Chibnall, Emma Jayne. “Contribution of Dissolved Organic Carbon Leaching to the Annual Carbon Budget of a Dairy Farm .” 2013. Masters Thesis, University of Waikato. Accessed March 08, 2021. http://hdl.handle.net/10289/7853.

MLA Handbook (7^th Edition):

Chibnall, Emma Jayne. “Contribution of Dissolved Organic Carbon Leaching to the Annual Carbon Budget of a Dairy Farm .” 2013. Web. 08 Mar 2021.

Vancouver:

Chibnall EJ. Contribution of Dissolved Organic Carbon Leaching to the Annual Carbon Budget of a Dairy Farm . [Internet] [Masters thesis]. University of Waikato; 2013. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10289/7853.

Council of Science Editors:

Chibnall EJ. Contribution of Dissolved Organic Carbon Leaching to the Annual Carbon Budget of a Dairy Farm . [Masters Thesis]. University of Waikato; 2013. Available from: http://hdl.handle.net/10289/7853

University of Georgia

2. Liao, Yuxi. A precision UV-Wet chemical oxidation dissolved organic carbon analyzer.

Degree: 2018, University of Georgia

URL: http://hdl.handle.net/10724/37922

► This study is aimed at the development of a high-precision (sub- Molar) dissolved organic carbon (DOC) analyzer for aquatic samples. The prototype analyzer uses ultraviolet… (more)

Subjects/Keywords: dissolved organic matter; dissolved organic carbon; wet chemical oxidation; photchemical oxidation

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APA (6^th Edition):

Liao, Y. (2018). A precision UV-Wet chemical oxidation dissolved organic carbon analyzer. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/37922

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liao, Yuxi. “A precision UV-Wet chemical oxidation dissolved organic carbon analyzer.” 2018. Thesis, University of Georgia. Accessed March 08, 2021. http://hdl.handle.net/10724/37922.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liao, Yuxi. “A precision UV-Wet chemical oxidation dissolved organic carbon analyzer.” 2018. Web. 08 Mar 2021.

Vancouver:

Liao Y. A precision UV-Wet chemical oxidation dissolved organic carbon analyzer. [Internet] [Thesis]. University of Georgia; 2018. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10724/37922.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liao Y. A precision UV-Wet chemical oxidation dissolved organic carbon analyzer. [Thesis]. University of Georgia; 2018. Available from: http://hdl.handle.net/10724/37922

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

McMaster University

3. Singh, Supriya. THE CONTROLS AND DRIVERS OF DISSOLVED ORGANIC CARBON QUANTITY AND DISSOLVED ORGANIC MATTER QUALITY IN AN IMPACTED GREAT LAKES WATERSHED.

Degree: MSc, 2019, McMaster University

URL: http://hdl.handle.net/11375/24898

►

Intensely managed and modified catchments in the Great Lakes are linked to eutrophication and hypoxia of receiving water bodies downstream, resulting in water quality impairment,… (more)

▼

Intensely managed and modified catchments in the Great Lakes are linked to eutrophication and hypoxia of receiving water bodies downstream, resulting in water quality impairment, and adverse impacts on aquatic ecology. While much focus has been on the role of phosphorous and nitrogen, dissolved organic carbon (DOC) plays a complex and critical role in lake biogeochemical cycles, as it influences the interations between nutrients and contaminants in water and soil through processes of mobilization, transport, biological uptake, and deposition. Human-dominated landscapes have a range of consequences on DOC dynamics as catchment hydrology, plant cover, and nutrient inputs are altered in these environments. As such, the objectives of this study were to identify the controls and drivers of DOC quantity and DOM quality in the Spencer Creek watershed, which is the largest contributor of water to Cootes Paradise that ultimately drains into Lake Ontario. The 159 km2 study area of the catchment is complex, as the present landscape is composed of a mosaic of various land uses including agriculture, forest, wetland, urban, and industrial regions. Flow alterations contribute to the complexity of the watershed as there are managed reservoirs and alterations in water courses. From 2016- 2018, hydrometric data was collected across 9 monitoring sites, along with surface water samples that were analyzed for DOC concentration and optical properties. Results indicate differences in flow magnitudes and stream DOC between dry and wet conditions, where concentrations during wet conditions were significantly higher compared to dry. Additionally, there was substantial variation in DOC concentration and quality across the Spencer Creek watershed. DOC concentrations were found to be the lowest at groundwater influenced sites in the headwaters of the watershed, and the highest in the mid-catchment region where DOC quality was strongly influenced by wetland sources. The reservoir-influenced sites showed relatively intermediate concentrations of DOC, with quality that exhibited strong microbial signatures. At the outlet, DOC concentrations were attenuated and DOC quality was intermediate between allochthonous and autochthonous end members, reflecting upstream mixing processes. These processes were presented as a conceptual model of water and DOC movement through the Spencer Creek watershed. The implications of this research suggest that with anticipated wetter and warmer conditions DOC concentrations would increase in the watershed. The repercussions of increased DOC concentrations overall imply a decrease of terrestrial carbon storage, and greater input into more reactive and susceptible pools, which may result in further water quality degradation. Overall, the findings from this research provide insight into the fate and transport of water and DOC in a complex, managed catchment in the Great Lakes region, with the aims of providing key information for local stakeholders.

Thesis

Master of Science (MSc)

Advisors/Committee Members: Carey, Sean, Geography and Earth Sciences.

Subjects/Keywords: dissolved organic carbon; hydrology; dissolved organic matter; Spencer Creek Watershed

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APA (6^th Edition):

Singh, S. (2019). THE CONTROLS AND DRIVERS OF DISSOLVED ORGANIC CARBON QUANTITY AND DISSOLVED ORGANIC MATTER QUALITY IN AN IMPACTED GREAT LAKES WATERSHED. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/24898

Chicago Manual of Style (16^th Edition):

Singh, Supriya. “THE CONTROLS AND DRIVERS OF DISSOLVED ORGANIC CARBON QUANTITY AND DISSOLVED ORGANIC MATTER QUALITY IN AN IMPACTED GREAT LAKES WATERSHED.” 2019. Masters Thesis, McMaster University. Accessed March 08, 2021. http://hdl.handle.net/11375/24898.

MLA Handbook (7^th Edition):

Singh, Supriya. “THE CONTROLS AND DRIVERS OF DISSOLVED ORGANIC CARBON QUANTITY AND DISSOLVED ORGANIC MATTER QUALITY IN AN IMPACTED GREAT LAKES WATERSHED.” 2019. Web. 08 Mar 2021.

Vancouver:

Singh S. THE CONTROLS AND DRIVERS OF DISSOLVED ORGANIC CARBON QUANTITY AND DISSOLVED ORGANIC MATTER QUALITY IN AN IMPACTED GREAT LAKES WATERSHED. [Internet] [Masters thesis]. McMaster University; 2019. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/11375/24898.

Council of Science Editors:

Singh S. THE CONTROLS AND DRIVERS OF DISSOLVED ORGANIC CARBON QUANTITY AND DISSOLVED ORGANIC MATTER QUALITY IN AN IMPACTED GREAT LAKES WATERSHED. [Masters Thesis]. McMaster University; 2019. Available from: http://hdl.handle.net/11375/24898

NSYSU

4. Lin, Ze-min. Removal of Organic Matters from Domestic Wastewater Using GAC Trickling Filter.

Degree: Master, Environmental Engineering, 2012, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707112-145620

► Because of high intense population is in Taiwan, households water use requires a considerable amount. It is substantially reduce daily water use to share primary… (more)

▼ Because of high intense population is in Taiwan, households water use requires a considerable amount. It is substantially reduce daily water use to share primary water resources, if we can reclaim domestic wastewater properly and make it support. Currently, reclaiming water is an emerging requirement for management and application. If we can adequately monitor and treat reclaimed water, reducing environmental contaminants, costs, and environmental feedback is possible. The study treated domestic wastewater of Feng-Shan river using GAC trickling filter with two column in a series and the removal efficiency of organic carbon was observed. The experimental results indicated that removal efficiency of organic carbon concentration was decreased as the empty-bed contact time (EBCT) increased. The best average removal efficiency of TOC and DOC was about 72% and 78%. According to the TOC removal rates using GAC at different temperatures, the TOC removal rates at room temperature and 4âwere respectively 95% and 90% in the first column of the experiment and 85% and 80% in the second column. The removal rates of dissolved organic carbon (DOC) using GAC folter system at room temperature and 4â were respectively 95% and 90% in the first column of the experiment and 90% and 87% in the second column. Obviously,the TOC removal rate treated using GAC filter system at room temperature was superior to that treated at 4â In comparing treated water and recycled water,most of the water quality parameters (temperatureãSuspended solidsãBODãCODãpH) were to meet recycled water quality standards.However, the system due to use GAC trickling filter system treatment that easily decrease dissolved oxygen in treated water but conductivity in treated water without changes. These two water parameters were failed to meet the recycled water standards. By the way, we found trained GAC through SEM irradiation the biofilm area of trained GAC surface at 25âwas superior to that treated at 4â. It corresponds to the removal efficiency of organic carbon, the removal efficiency of 25â was higher than result of 4â. Therefore, a certain relationship between the biofilm area and removal efficiency of organic carbon is existed in this work. Advisors/Committee Members: Chung-Bang Chen (chair), Shui-Jen Chen (chair), Chih-Huang Weng (chair), Jimmy C. M. Kao (chair), Jie-Chung Lou (committee member).

Subjects/Keywords: bio-activated carbon filter system; total organic carbon; dissolved organic carbon

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APA (6^th Edition):

Lin, Z. (2012). Removal of Organic Matters from Domestic Wastewater Using GAC Trickling Filter. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707112-145620

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lin, Ze-min. “Removal of Organic Matters from Domestic Wastewater Using GAC Trickling Filter.” 2012. Thesis, NSYSU. Accessed March 08, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707112-145620.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lin, Ze-min. “Removal of Organic Matters from Domestic Wastewater Using GAC Trickling Filter.” 2012. Web. 08 Mar 2021.

Vancouver:

Lin Z. Removal of Organic Matters from Domestic Wastewater Using GAC Trickling Filter. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Mar 08]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707112-145620.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lin Z. Removal of Organic Matters from Domestic Wastewater Using GAC Trickling Filter. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707112-145620

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tasmania

5. Matsumoto, M. Aspects of the interaction between the marine bacterium Alcanivorax DG881 and the toxic dinoflagellate Gymnodinium catenatum.

Degree: 2011, University of Tasmania

URL: https://eprints.utas.edu.au/12489/2/Matsumoto.pdf

► The presence of a bacterial community is vital to the germination and growth of the toxic dinoflagellate Gymnodinium catenatum. Previous research has shown that the… (more)

▼ The presence of a bacterial community is vital to the germination and growth of the toxic dinoflagellate Gymnodinium catenatum. Previous research has shown that the bacterium Alcanivorax DG881 is an important stimulatory member of the dinoflagellate-associated bacterial community, however the nature of the interaction between the two organisms, and the substances and mechanism involved in growth stimulation are unknown. This thesis uses a uni-bacterial G. catenatum experimental culture model to investigate elements of the interaction between the marine bacterium Alcanivorax DG881 with the dinoflagellate G. catenatum. In the first experiment, three treatments were used to determine whether the G. catenatum growth stimulating substances produced by Alcanivorax DG881 were extracellular or intracellular substances, and whether these substances need to be continuously provided to G. catenatum to support growth. Addition of extracellular filtrates from cultures of G. catenatum and it’s associated bacteria showed increased growth stimulating activity in resting cyst germination experiments compared to treatments containing intracellular substances from Alcanivorax DG881 in absence of live Alcanivorax DG881 cells. Repeated addition of extracellular filtrates sustained G. catenatum growth after germination for a significantly longer period and to higher cell concentrations than a single addition of extracellular filtrate. These results indicated that the G. catenatum did not obtain growth stimulating substances by ingesting bacteria but requires one or more extracellular dissolved products produced by Alcanivorax DG881. The patterns of growth suggest that the products were either labile or utilised by the dinoflagellate during growth. It has been proposed that dinoflagellate-associated Alcanivorax DG881 benefits from the utilization of dissolved organic carbon (DOC) exuded from the dinoflagellate cell. To examine this idea, the single carbon utilization profile of Alcanivorax DG881 was compared with the closely related but no-stimulatory strain Alcanivorax borkumensis SK2 using the BIOLOG GN2 plate assay system. Alcanivorax DG881 was able to use a much wider range of carbon compounds for growth than Alcanivorax borkumensis SK2, particular a wider range of amino acids, known as an important component of the DOC exuded from algal cells. The data here suggest that Alcanivorax DG881 is relatively better adapted to a life associated with algal cells than Alcanivorax borkumensis SK2. Detection and sequence characterization of putative saxitoxin synthesis gene homologues was attempted. Degenerate PCR primers designed from sequence of three putative saxitoxin biosynthesis (Sxt) genes from cyanobacteria was used to screen G. catenatum total DNA extracts. PCR products of expected length were obtained for three Sxt genes and two products were sequenced and compared to the putative cyanobacterial homolog and other published DNA sequences available on Genbank. The putative G. catenatum SxtN gene sequence showed highest similarity with…

Subjects/Keywords: dinoflagellate; Alcanivorax; DG881; dissolved organic carbon; saxitoxin

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APA (6^th Edition):

Matsumoto, M. (2011). Aspects of the interaction between the marine bacterium Alcanivorax DG881 and the toxic dinoflagellate Gymnodinium catenatum. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/12489/2/Matsumoto.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Matsumoto, M. “Aspects of the interaction between the marine bacterium Alcanivorax DG881 and the toxic dinoflagellate Gymnodinium catenatum.” 2011. Thesis, University of Tasmania. Accessed March 08, 2021. https://eprints.utas.edu.au/12489/2/Matsumoto.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Matsumoto, M. “Aspects of the interaction between the marine bacterium Alcanivorax DG881 and the toxic dinoflagellate Gymnodinium catenatum.” 2011. Web. 08 Mar 2021.

Vancouver:

Matsumoto M. Aspects of the interaction between the marine bacterium Alcanivorax DG881 and the toxic dinoflagellate Gymnodinium catenatum. [Internet] [Thesis]. University of Tasmania; 2011. [cited 2021 Mar 08]. Available from: https://eprints.utas.edu.au/12489/2/Matsumoto.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Matsumoto M. Aspects of the interaction between the marine bacterium Alcanivorax DG881 and the toxic dinoflagellate Gymnodinium catenatum. [Thesis]. University of Tasmania; 2011. Available from: https://eprints.utas.edu.au/12489/2/Matsumoto.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waikato

6. Sturgeon, Catherine. Assessing dissolved organic carbon export from Kopuatai bog, New Zealand .

Degree: 2013, University of Waikato

URL: http://hdl.handle.net/10289/7936

► Peatlands sequester carbon (C) through CO₂ uptake and, ultimately, storage as peat. Carbon is lost from peatlands though gaseous pathways (as CO₂ and CH₄) and… (more)

▼ Peatlands sequester carbon (C) through CO₂ uptake and, ultimately, storage as peat. Carbon is lost from peatlands though gaseous pathways (as CO₂ and CH₄) and water pathways as dissolved organic C (DOC), dissolved inorganic C (DIC), particulate organic C (POC) or dissolved CO₂ and CH₄. Many studies have shown that the loss of C through DOC export is an important component of the annual C budget, but there are very few published studies where atmospheric fluxes of CO₂ and CH₄ and waterborne fluxes of DOC are measured at the same time. Also, little is known about the spatial variations in DOC concentration within peatlands and the processes leading to the delivery of DOC into rivers. The research described in this thesis focuses on understanding the ways in which vegetation, temperature, peat quality and hydrology interact to determine variability in DOC concentrations and export, both seasonally and spatially, at Kopuatai bog. DOC concentrations were measured at 14 sites across the bog for a year. At each site peat pore water was sampled from three different depths and represented three different vegetation types dominated by Empodisma robustum (jointed wire rush), Leptospermum scoparium (manuka) and Sporadanthus ferrugineus. There were no strong seasonal trends in DOC concentration, possibly due to the small seasonal range in temperatures. DOC concentrations varied spatially, with highest concentrations found under L. scoparium vegetation, likely due to differing chemical properties of plant materials leading to higher decomposition rates. DOC concentration did not vary significantly with depth. DOC export was estimated using a water balance based approach where evaporation (E), precipitation (P) and change in storage were measured to determine water discharge (Q) from the eddy covariance (EC) footprint. Discharge was then multiplied by average DOC concentrations within the EC footprint to derive DOC export. This method had not been directly applied in the literature. It was estimated that 11.7 ± 0.82 g C m⁻² of DOC was exported from the EC footprint from the year 1 February 2012 to 1 February 2013, which is at the lower end of the range when compared to literature values. DOC export had strong seasonal variation with highest export during the winter due to high rainfall and lowest in summer due to low rainfall. A simple method to estimate DOC export was proposed using the strong correlations between DOC export and monthly P and P–E. When annual DOC export was compared to annual net ecosystem exchange (NEE) at Kopuatai, DOC export was equivalent to only 6% of CO₂ sequestered in a year. This is in contrast to the literature where, on average, DOC export is often equal to around 25% of NEE. Preliminary analyses shows that NEE values are significantly higher at Kopuatai than NEE published for Northern Hemisphere peatlands and this is likely an effect of the dominance by vascular plants and the year-round growing conditions at Kopuatai. Advisors/Committee Members: Campbell, David I (advisor), Schipper, Louis A (advisor).

Subjects/Keywords: peatland; bog; dissolved organic carbon; peat; DOC

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sturgeon, C. (2013). Assessing dissolved organic carbon export from Kopuatai bog, New Zealand . (Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/7936

Chicago Manual of Style (16^th Edition):

Sturgeon, Catherine. “Assessing dissolved organic carbon export from Kopuatai bog, New Zealand .” 2013. Masters Thesis, University of Waikato. Accessed March 08, 2021. http://hdl.handle.net/10289/7936.

MLA Handbook (7^th Edition):

Sturgeon, Catherine. “Assessing dissolved organic carbon export from Kopuatai bog, New Zealand .” 2013. Web. 08 Mar 2021.

Vancouver:

Sturgeon C. Assessing dissolved organic carbon export from Kopuatai bog, New Zealand . [Internet] [Masters thesis]. University of Waikato; 2013. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10289/7936.

Council of Science Editors:

Sturgeon C. Assessing dissolved organic carbon export from Kopuatai bog, New Zealand . [Masters Thesis]. University of Waikato; 2013. Available from: http://hdl.handle.net/10289/7936

King Abdullah University of Science and Technology

7. Ouf, Mohamed. The Role of Dissolved Organic Carbon and Preadaptation in the Biotransformation of Trace Organic Chemicals during Aquifer Recharge and Recovery.

Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/224751

► Aquifer recharge and recovery (ARR) is a low-cost and environmentally-friendly treatment technology which uses conventionally treated wastewater effluent for groundwater recharge and subsequent recovery for… (more)

Subjects/Keywords: Aquifer; Recharge; Carbon; Organic; Recovery; Dissolved

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APA (6^th Edition):

Ouf, M. (2012). The Role of Dissolved Organic Carbon and Preadaptation in the Biotransformation of Trace Organic Chemicals during Aquifer Recharge and Recovery. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/224751

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ouf, Mohamed. “The Role of Dissolved Organic Carbon and Preadaptation in the Biotransformation of Trace Organic Chemicals during Aquifer Recharge and Recovery.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed March 08, 2021. http://hdl.handle.net/10754/224751.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ouf, Mohamed. “The Role of Dissolved Organic Carbon and Preadaptation in the Biotransformation of Trace Organic Chemicals during Aquifer Recharge and Recovery.” 2012. Web. 08 Mar 2021.

Vancouver:

Ouf M. The Role of Dissolved Organic Carbon and Preadaptation in the Biotransformation of Trace Organic Chemicals during Aquifer Recharge and Recovery. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10754/224751.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ouf M. The Role of Dissolved Organic Carbon and Preadaptation in the Biotransformation of Trace Organic Chemicals during Aquifer Recharge and Recovery. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/224751

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

8. Cioce, Danielle. Sources and Fates of Dissolved Organic Carbon in Rural and Urban Watersheds in Brazos County, Texas.

Degree: MS, Water Management and Hydrological Science, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11638

► The Bryan/College Station (B/CS) region has been reported to have elevated concentrations of dissolved organic carbon (DOC) in surface water. Increased DOC concentrations are worrisome… (more)

▼ The Bryan/College Station (B/CS) region has been reported to have elevated concentrations of dissolved organic carbon (DOC) in surface water. Increased DOC concentrations are worrisome as DOC has been shown to be an energy source for the recovery and regrowth of E. coli and many watersheds are impaired by high bacteria levels. To examine the sources and fates of DOC in rural and urban regions to better understand DOC movement though the environment, seven watersheds were studied. To investigate source, streams were analyzed using diffuse reflectance near infrared spectroscopy (DR-NIR) and carbon isotopes. Fate of DOC was determined through monthly streams samples, gathered between March 2011 and February 2012, which were incubated for biodegradable DOC (BDOC). Soil in the region was sampled based on land use categories. Soil was analyzed for DOC and BDOC as well as DOC adsorption, the other major fate of DOC. Above ground vegetation was sampled in conjunction with soil and analyzed for BDOC. Data indicated that fecal matter from cliff swallows provided considerable organic material to streams in the B/CS region as shown through DR-NIR. Carbon isotope values in streams ranged from -23.5 +/- 0.7% to -26.8 +/- 0.5%. Stream spectra may be able to predict carbon isotope values in streams (Adj. R2 = 0.88). Mean annual stream DOC concentrations ranged from 11 +/- 3 mg/L to 31 +/- 12 mg/L, which represents a significant decrease in DOC between 2007 and 2011. Concurrent increases in pH and conductivity were also recorded. The decrease in DOC and the increases in pH and conductivity may be due to impacts of high sodium irrigation tap water. Biodegradable DOC was low in streams, which is likely due to DOC being present in streams in refractory forms that are resistant to microbial breakdown. Soil chemistry, including soil adsorption, was greatly influenced by sodium. The elevated adsorption coefficients and release values seen in highly developed and urban open areas can be attributed to frequent exposure to high sodium irrigation water. The results indicate that sodium is a major driver of DOC in the system. Sound management decisions concerning irrigation water chemistry and urban development might eventually emerge to protect water quality as a result of this research. Advisors/Committee Members: Aitkenhead-Peterson, Jacqueline A. (advisor), Boutton, Thomas W. (committee member), Wilcox, Bradford P. (committee member).

Subjects/Keywords: dissolved organic carbon; biodegradable dissolved organic carbon; soil adsorption; near infrared spectroscopy; isotopes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cioce, D. (2012). Sources and Fates of Dissolved Organic Carbon in Rural and Urban Watersheds in Brazos County, Texas. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11638

Chicago Manual of Style (16^th Edition):

Cioce, Danielle. “Sources and Fates of Dissolved Organic Carbon in Rural and Urban Watersheds in Brazos County, Texas.” 2012. Masters Thesis, Texas A&M University. Accessed March 08, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11638.

MLA Handbook (7^th Edition):

Cioce, Danielle. “Sources and Fates of Dissolved Organic Carbon in Rural and Urban Watersheds in Brazos County, Texas.” 2012. Web. 08 Mar 2021.

Vancouver:

Cioce D. Sources and Fates of Dissolved Organic Carbon in Rural and Urban Watersheds in Brazos County, Texas. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11638.

Council of Science Editors:

Cioce D. Sources and Fates of Dissolved Organic Carbon in Rural and Urban Watersheds in Brazos County, Texas. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11638

Louisiana State University

9. DelDuco, Emily. Floodplain Impacts on Water Quality: A Case Study In Southern Louisiana.

Degree: MS, Biogeochemistry, 2017, Louisiana State University

URL: https://digitalcommons.lsu.edu/gradschool_theses/4349

► The quantity and quality of dissolved carbon delivered to coastal margins by rivers is an important component of global carbon cycling. The Atchafalaya River… (more)

▼ The quantity and quality of dissolved carbon delivered to coastal margins by rivers is an important component of global carbon cycling. The Atchafalaya River (AR) discharges ~25% of the flow of the Mississippi River (MR) and the total flow of the Red River (RR) into the Gulf of Mexico (GoM) annually while flowing through the largest bottomland swamp in North America. This provides a unique opportunity to study floodplain impacts on dissolved carbon processes in a large river system. The research aimed to: (1) determine DIC and DOC transport and processing by a river swamp basin under varied seasons and flow conditions, using the AR as a case study; (2) describe how the major tributaries of the AR affect dissolved carbon concentrations and dynamics (3) provide much-needed estimates for export of carbon to the GoM by the AR. From May 2015 -May 2016, I analyzed DOC and DIC concentrations, mass loads, and δ ¹³Cstable isotope composition of waters in the AR’s tributaries, and its origin and outlet locations. The RR contributed the majority of DOC to this system. The MR contributed the majority of DIC. During the study period, the AR exported 5.35 Tg DIC and 2.34 Tg DOC into the GoM. Based on the mass inflow-outflow balance, approximately 0.53 Tg (~10%) of the total DIC exported was produced within the floodplain, while 0.24 Tg (~10%) of DOC entering the basin was removed. All sites were saturated with pCO₂, indicating that this swamp-river system acts a large source of DIC to the atmosphere as well as to coastal margins. Largest downstream changes to concentrations and loads occurred during periods when the adjacent wetlands were deeply inundated. The changes corresponded with shifts in isotopic composition that suggested inputs of DIC from floodplains. This effect was particularly pronounced during early flood stages. This thesis research demonstrates that a major river with extensive floodplains in its coastal margin can act as an important source of DIC and a sink for DOC.

Subjects/Keywords: Atchafalaya River; floodplain; dissolved organic carbon; dissolved inorganic carbon; carbon cycling; wetland

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APA (6^th Edition):

DelDuco, E. (2017). Floodplain Impacts on Water Quality: A Case Study In Southern Louisiana. (Masters Thesis). Louisiana State University. Retrieved from https://digitalcommons.lsu.edu/gradschool_theses/4349

Chicago Manual of Style (16^th Edition):

DelDuco, Emily. “Floodplain Impacts on Water Quality: A Case Study In Southern Louisiana.” 2017. Masters Thesis, Louisiana State University. Accessed March 08, 2021. https://digitalcommons.lsu.edu/gradschool_theses/4349.

MLA Handbook (7^th Edition):

DelDuco, Emily. “Floodplain Impacts on Water Quality: A Case Study In Southern Louisiana.” 2017. Web. 08 Mar 2021.

Vancouver:

DelDuco E. Floodplain Impacts on Water Quality: A Case Study In Southern Louisiana. [Internet] [Masters thesis]. Louisiana State University; 2017. [cited 2021 Mar 08]. Available from: https://digitalcommons.lsu.edu/gradschool_theses/4349.

Council of Science Editors:

DelDuco E. Floodplain Impacts on Water Quality: A Case Study In Southern Louisiana. [Masters Thesis]. Louisiana State University; 2017. Available from: https://digitalcommons.lsu.edu/gradschool_theses/4349

NSYSU

10. Wang, Wun-bin. Effect of operating conditions on the removal of TOC and DOC from municipal wastewater using a biological contact process.

Degree: Master, Environmental Engineering, 2016, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0022116-111513

► In this study, we used a biological contact process(BCP) to treat municipal wastewater to investigate the effect of total organic carbon (TOC) and dissolved organic… (more)

Subjects/Keywords: Biological Contact Process; Total Organic Carbon; Dissolved Organic Carbon

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APA (6^th Edition):

Wang, W. (2016). Effect of operating conditions on the removal of TOC and DOC from municipal wastewater using a biological contact process. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0022116-111513

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Wun-bin. “Effect of operating conditions on the removal of TOC and DOC from municipal wastewater using a biological contact process.” 2016. Thesis, NSYSU. Accessed March 08, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0022116-111513.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Wun-bin. “Effect of operating conditions on the removal of TOC and DOC from municipal wastewater using a biological contact process.” 2016. Web. 08 Mar 2021.

Vancouver:

Wang W. Effect of operating conditions on the removal of TOC and DOC from municipal wastewater using a biological contact process. [Internet] [Thesis]. NSYSU; 2016. [cited 2021 Mar 08]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0022116-111513.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang W. Effect of operating conditions on the removal of TOC and DOC from municipal wastewater using a biological contact process. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0022116-111513

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

11. Chang, Ting-Wei. Modeling variation of pollutants in advanced and conventional water treatment process.

Degree: PhD, Environmental Engineering, 2011, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0816111-155146

► According to the literature, the deterioration of water quality in pipeline networks of water distribution is not solely due to the deterioration of raw water… (more)

▼ According to the literature, the deterioration of water quality in pipeline networks of water distribution is not solely due to the deterioration of raw water quality outlet from water treatment plants, but primarily due to the multiplication of microorganisms in water distribution pipelines, a phenomenon known as after-growth or re-growth. Presently, the most effective method of a biological stability in treated water for controlling microbial re-growth is by limiting nutrients, including nitrogen, phosphorus, and organic carbon. The content of assimilable organic carbon (AOC) within organic carbon is considered to be the most main factor for controlling the growth of microorganisms in the water distribution systems. The objects of this work were to study the Cheng Ching Lake Water Treatment Plant (CCLWTP) in Kaohsiung and the Gong Yuan Water Treatment Plant (GYWTP) in Chiayi. Water samples were collected once a month from December 2008 to November 2009. The major difference between the study objects was that front one is an advanced water treatment plant, and the other a traditional one. In order to understand the difference in biological stability between these two water treatment plants, AOC meaurement was conducted. The goals of this study were: (1) to understand the water purification process of advanced and traditional water treatment plants, and to understand the concentration in AOC fluctuation in their water distribution networks; (2) to learn about differences in how the two water treatment plants remove AOC, and to know where is improvement ; (3) to use program analysis to produce a simple formula and AOC-related water quality parameters for the two water treatment plants, providing AOC control and management strategies in the future. The results concluded that the raw water of the two water treatment plants was primarily a hybrid of hydrophobic and hydrophilic molecules, and the highest values of AOC were found in winter. The CCLWTP had an overall removal rate of 54 %, and the GYWTP had an overall removal rate of 36 %. The CCLWTP conformed to the additions of an advanced water purification unit, but the water treatment process was relatively complex. Its AOC concentration varied considerably during the course of the water treatment process, while that of the GYWTP showed more stable measurements. The CCLWTP used coagulation precipitation, rapid filtration, and biological activated carbon filtration to effectively remove the AOC. The coagulation precipitation unit used by the GYWTP was most effective process in the removal of AOC and rapid filtering was less effective one. The treated water of CCLWTP maintained an AOC concentration under 51 Î¼g acetate-C/L in its water distribution network, while the treated water of GYWTP mostly kept a concentration of AOC lower than 71 Î¼g acetate-C/L. Although the CCLWTP water pipe network had lower AOC values, it demonstrated unstable changes in levels of AOC concentration. This shows that oxidation and disinfectants in the water treatment process cannot successfully… Advisors/Committee Members: Shui-Jen Chen (chair), Jie-Chung Lou (committee member), Chih-Huang Weng (chair), Chien-Kuei Chang (chair), Chung-Bang Chen (chair).

Subjects/Keywords: total organic carbon; assimilable organic carbon; water treatment; AutoNet; regrowth; dissolved organic carbon

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APA (6^th Edition):

Chang, T. (2011). Modeling variation of pollutants in advanced and conventional water treatment process. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0816111-155146

Chicago Manual of Style (16^th Edition):

Chang, Ting-Wei. “Modeling variation of pollutants in advanced and conventional water treatment process.” 2011. Doctoral Dissertation, NSYSU. Accessed March 08, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0816111-155146.

MLA Handbook (7^th Edition):

Chang, Ting-Wei. “Modeling variation of pollutants in advanced and conventional water treatment process.” 2011. Web. 08 Mar 2021.

Vancouver:

Chang T. Modeling variation of pollutants in advanced and conventional water treatment process. [Internet] [Doctoral dissertation]. NSYSU; 2011. [cited 2021 Mar 08]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0816111-155146.

Council of Science Editors:

Chang T. Modeling variation of pollutants in advanced and conventional water treatment process. [Doctoral Dissertation]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0816111-155146

University of Texas – Austin

12. -3330-7642. The behavior of dissolved organic carbon (DOC) at geological sequestration sites.

Degree: MSin Geological Sciences, Geological Sciences, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/32597

► Geologic carbon sequestration has been proposed as a means of mitigating anthropogenic greenhouse gas emissions. At depth, supercritical CO₂ may rise above the surrounding fluid.… (more)

Subjects/Keywords: Geologic carbon sequestration; Dissolved organic carbon; Carbon dioxide storage reservoirs

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APA (6^th Edition):

-3330-7642. (2015). The behavior of dissolved organic carbon (DOC) at geological sequestration sites. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32597

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-3330-7642. “The behavior of dissolved organic carbon (DOC) at geological sequestration sites.” 2015. Masters Thesis, University of Texas – Austin. Accessed March 08, 2021. http://hdl.handle.net/2152/32597.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-3330-7642. “The behavior of dissolved organic carbon (DOC) at geological sequestration sites.” 2015. Web. 08 Mar 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-3330-7642. The behavior of dissolved organic carbon (DOC) at geological sequestration sites. [Internet] [Masters thesis]. University of Texas – Austin; 2015. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/2152/32597.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-3330-7642. The behavior of dissolved organic carbon (DOC) at geological sequestration sites. [Masters Thesis]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32597

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Louisiana State University

13. He, Songjie. Changes in Carbon, Nutrient, and Trace Metal Concentrations During the Transition from Freshwater to Marine Environments - A Case Study in Southwest Louisiana.

Degree: PhD, Agriculture, 2018, Louisiana State University

URL: https://digitalcommons.lsu.edu/gradschool_dissertations/4530

► Rivers carry terrestrial nutrients and other materials to estuaries, affecting biogeochemical cycles and ecosystems in coastal margins. This dissertation research incorporated five studies to… (more)

▼ Rivers carry terrestrial nutrients and other materials to estuaries, affecting biogeochemical cycles and ecosystems in coastal margins. This dissertation research incorporated five studies to investigate the dynamics of carbon, nutrients, and trace metals in four major coastal rivers in southwest Louisiana – the Sabine, Calcasieu, Mermentau, and Vermilion Rivers. The overarching goal of this research was to broaden the knowledge and understanding of biogeochemical processes in freshwater – saltwater mixing zones. These studies employed decade-long monitoring records of water chemistry, utilized monthly field measurements conducted over a two-year period, and used analysis of over 200 water samples for carbon, nitrogen, phosphorus, and trace metals. Results gained from the studies showed that land use effects were clearly reflected in the much higher TOC, NO₃+NO₂, TKN, and TP yields from the Mermentau and Vermilion Rivers draining more agriculture-intensive watersheds, when compared with those of the Sabine and Calcasieu Rivers. The high average pCO₂ value (2528 µatm) for the entire Calcasieu River reach suggests that an estuarine river functions as a CO₂ source in the atmosphere. The DIC concentrations and δ¹³C_DIC values increased rapidly with the increase of salinity. The DIC concentration appeared to be mostly controlled by conservative mixing. The δ¹³C_DIC values during the study period were either close to or below those values suggested by the conservative mixing model, implying that an estuarine river can fluctuate from a balanced system to a heterotrophic system seasonally. The DOC concentration decreased with decreasing distance to the northern Gulf of Mexico, but to a much smaller degree. The depleted δ¹³C_DOC values (-30.56‰ to -25.92‰) in the Calcasieu River suggest that the DOC discharged by this river was highly terrestrially derived. The DIP concentration versus salinity plots in the Calcasieu River suggest some sources were present throughout the Calcasieu Estuary. Such mixing dynamic were probably caused by desorption of DIP from suspended solids and river bed sediments, urban inputs, as well as stronger calcium carbonate and phosphorus co-precipitation at the marine endmember. The total Sr concentration and the Sr/Ca ratio both increased significantly with increasing salinity. In contrast, salinity has no effect on Ba concentration.

Subjects/Keywords: Gulf of Mexico; Calcasieu River; Mermentau River; Vermilion River; Dissolved Inorganic Carbon; Dissolved Organic Carbon

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APA (6^th Edition):

He, S. (2018). Changes in Carbon, Nutrient, and Trace Metal Concentrations During the Transition from Freshwater to Marine Environments - A Case Study in Southwest Louisiana. (Doctoral Dissertation). Louisiana State University. Retrieved from https://digitalcommons.lsu.edu/gradschool_dissertations/4530

Chicago Manual of Style (16^th Edition):

He, Songjie. “Changes in Carbon, Nutrient, and Trace Metal Concentrations During the Transition from Freshwater to Marine Environments - A Case Study in Southwest Louisiana.” 2018. Doctoral Dissertation, Louisiana State University. Accessed March 08, 2021. https://digitalcommons.lsu.edu/gradschool_dissertations/4530.

MLA Handbook (7^th Edition):

He, Songjie. “Changes in Carbon, Nutrient, and Trace Metal Concentrations During the Transition from Freshwater to Marine Environments - A Case Study in Southwest Louisiana.” 2018. Web. 08 Mar 2021.

Vancouver:

He S. Changes in Carbon, Nutrient, and Trace Metal Concentrations During the Transition from Freshwater to Marine Environments - A Case Study in Southwest Louisiana. [Internet] [Doctoral dissertation]. Louisiana State University; 2018. [cited 2021 Mar 08]. Available from: https://digitalcommons.lsu.edu/gradschool_dissertations/4530.

Council of Science Editors:

He S. Changes in Carbon, Nutrient, and Trace Metal Concentrations During the Transition from Freshwater to Marine Environments - A Case Study in Southwest Louisiana. [Doctoral Dissertation]. Louisiana State University; 2018. Available from: https://digitalcommons.lsu.edu/gradschool_dissertations/4530

University of Connecticut

14. Perry, Rachel A. Nutrient Dynamics of Floating Seagrass Wracks in Greater Florida Bay.

Degree: MS, Oceanography, 2015, University of Connecticut

URL: https://opencommons.uconn.edu/gs_theses/817

► Floating aggregations of seagrass wrack (i.e., leaves shed from seagrass beds) can serve as an ecological “hot spot” contributing to the survival of many… (more)

▼ Floating aggregations of seagrass wrack (i.e., leaves shed from seagrass beds) can serve as an ecological “hot spot” contributing to the survival of many species in the form of habitat and food source. Considerable research has been done on assessing trophic transfer of nutrients from seagrass wrack that is washed ashore, but little is known about nutrient dynamics in floating seagrass wrack. Here, drifters were deployed to track the location of floating wracks created in Greater Florida Bay and mesocosm experiments were conducted on two different of floating macrophytes (Syringodium filiforme, Thalassia testudinum, and Sargassum sp.) to estimate the sinking rate and the contribution of particulate and dissolved carbon and nitrogen released from the floating wracks. Floating wracks were tracked and carried through channels from Greater Florida Bay S. filiforme beds to near the Gulf Stream 15 km offshore. A large fraction of seagrass leaves remained buoyant for over 14 days in the mesocosms with daily shedding rates of individual leaves statistically decreasing over time from 10-15% initially to less than 5% after 6 days. When individual leaves became aggregated into whorled structures, as found offshore, the shedding rate became negligible at <2% d^-1 and wracks can persist for extended times. As the floating wrack ages it contributes to nutrient pools, especially total dissolved nitrogen (TDN), dissolved organic carbon (DOC), and colored dissolved organic material pools. TDN was composed of approximately 80% dissolved organic nitrogen, with remainder dissolved inorganic nitrogen largely composed of ammonium. Both TDN and DOC showed variable rates of change but ultimately increased concentration from initial to final days of incubation. With the duration of wracks and the amount of nutrients produced, seagrass wrack can serve as an important resource for organisms living in oligotrophic waters. Advisors/Committee Members: Heidi Dierssen, Julie Granger, Jamie Vaudrey.

Subjects/Keywords: Seagrass wrack; Greater Florida Bay; Dissolved organic nitrogen; Dissolved organic carbon; Floating wrack; wrack; Seagrass

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APA (6^th Edition):

Perry, R. A. (2015). Nutrient Dynamics of Floating Seagrass Wracks in Greater Florida Bay. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/817

Chicago Manual of Style (16^th Edition):

Perry, Rachel A. “Nutrient Dynamics of Floating Seagrass Wracks in Greater Florida Bay.” 2015. Masters Thesis, University of Connecticut. Accessed March 08, 2021. https://opencommons.uconn.edu/gs_theses/817.

MLA Handbook (7^th Edition):

Perry, Rachel A. “Nutrient Dynamics of Floating Seagrass Wracks in Greater Florida Bay.” 2015. Web. 08 Mar 2021.

Vancouver:

Perry RA. Nutrient Dynamics of Floating Seagrass Wracks in Greater Florida Bay. [Internet] [Masters thesis]. University of Connecticut; 2015. [cited 2021 Mar 08]. Available from: https://opencommons.uconn.edu/gs_theses/817.

Council of Science Editors:

Perry RA. Nutrient Dynamics of Floating Seagrass Wracks in Greater Florida Bay. [Masters Thesis]. University of Connecticut; 2015. Available from: https://opencommons.uconn.edu/gs_theses/817

University of Georgia

15. Reader, Heather Erin. Smouldering oceans.

Degree: 2014, University of Georgia

URL: http://hdl.handle.net/10724/27278

► Marine dissolved organic carbon (DOC) is one of the largest and most dynamic pools of reduced carbon on earth. Photochemical processes have the potential to… (more)

▼ Marine dissolved organic carbon (DOC) is one of the largest and most dynamic pools of reduced carbon on earth. Photochemical processes have the potential to significantly affect the content of this DOC pool. Photochemical oxidation to carbon monoxide and carbon dioxide are two direct pathways for the removal of DOC from the marine system. Indirectly, photochemical processes can lead to the removal of DOC through the alteration of chemical structures rendering them more biologically labile. In order to assess the influence of photochemistry on the coastal carbon cycle the variability of these processes must be well constrained. To calculate photochemical production in marine waters, it is crucial to know how light is absorbed by chromophoric dissolved organic matter (CDOM), as well as the spectral efficiency of the resulting photochemical reactions (i.e. the apparent quantum yield (AQY) spectra). The challenges of using visible wavelength CDOM absorption data to model ultraviolet absorption data are investigated. Direct measurements of ultraviolet absorption data model photochemical processes best. When this is not possible, visible data can be used with an accuracy of +/- 10% in coastal waters. Either a hyperbolic absorption model or one using correction factors applied to a traditional exponential model will allow for similar accuracy in the ultraviolet portion of the absorption spectrum. The variability of photochemical oxidation of dissolved organic carbon in a coastal system was studied in order to constrain remote sensing calculations. The variability of CO and CO2 AQY spectra were relatively well constrained in three estuaries of Georgia, USA. The AQY for CO varied within +/- 12.7% year-round while CO2 varied within +/- 33.6% year-round. Hyperspectral remote sensing reveals finescale hydrodynamic structure in estuarine systems and is readily adaptable to photochemical modeling applications. Defining the variability of photochemistry’s influence on the biological lability of DOC is a complex undertaking. Unlike direct photochemical oxidation of DOC to CO and CO2, the biologically labile products (BLPs) of incomplete oxidation can themselves be photochemically reactive. Competition between production and destruction of BLPs during irradiation is a significant consideration when determining the quantitative influence of photochemistry on marine systems.

Subjects/Keywords: Photochemistry; Carbon Monoxide; Carbon Dioxide; Biological Lability; Dissolved Organic Carbon; Chromophoric Dissolved Organic Matter; Remote Sensing; Estuaries

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APA (6^th Edition):

Reader, H. E. (2014). Smouldering oceans. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/27278

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Reader, Heather Erin. “Smouldering oceans.” 2014. Thesis, University of Georgia. Accessed March 08, 2021. http://hdl.handle.net/10724/27278.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Reader, Heather Erin. “Smouldering oceans.” 2014. Web. 08 Mar 2021.

Vancouver:

Reader HE. Smouldering oceans. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10724/27278.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Reader HE. Smouldering oceans. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/27278

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Georgia

16. Powers, Leanne. Probing the photochemical reactivity of oceanic dissolved organic carbon.

Degree: 2015, University of Georgia

URL: http://hdl.handle.net/10724/31492

► After 20 years of research in aquatic photochemistry, there remains a need to identify and constrain many photochemical reactions involving colored dissolved organic matter (CDOM).… (more)

▼ After 20 years of research in aquatic photochemistry, there remains a need to identify and constrain many photochemical reactions involving colored dissolved organic matter (CDOM). This thesis uses laboratory and field studies in diverse marine systems to examine the photochemical efficiency and reaction rates for carbon monoxide (CO), carbon dioxide (CO2), superoxide (O2-) and hydrogen peroxide (H2O2), all important photoproducts, and improves quantitative understanding of photochemistry’s significance in biogeochemical cycles. Input of these results to ocean color-based models allowed estimation of photochemical rates on regional and global scales. Direct photo-oxidation of dissolved organic carbon (DOC) to CO2 and CO is a significant, albeit poorly constrained, DOC removal mechanism. Working in the Northern Gulf of Mexico, we amassed the largest cohesive CO apparent quantum yield (AQY) data set for any marine region (n=99; 18 paired with CO2), defining distinct inshore and offshore AQY spectra for improved regional photochemical rate models. Analytical limitations for determining CO2 AQY spectra forced the use of ill-defined coastal CO2:CO ratios (~6 − 66) for blue water CO2 calculations, highlighting the need for new direct methods or better proxies to quantify CO2 photochemistry in marine waters. Significant photochemical removal of biologically refractory DOC (RDOC), well-mixed in the ocean but isolated at depth, is not compatible with its 14C age. Reevaluation of RDOC photochemical reactivity using paired O2- and H2O2 photoproduction studies for abyssal Gulf of Alaska samples showed declining O2- steady-state concentrations during long-term exposure, with little or no H2O2 accumulation past ~6 − 12 hours. This is consistent with a loss of O2- source, a shift to oxidative pathways for O2 decay, and a lack of long-term photochemical reactivity for RDOC. Because H2O2 formation is a thermal reaction involving O¬2-, blending remotely sensed sea surface temperature and color allowed correction of H2O2 AQY spectra and production of the first global H¬2O2 and O2 photoproduction rate maps from remotely sensed data. Further analysis of paired H2O2 and CO2 photoproduction experiments indicated that H2O2 is a far better proxy for CO2 photoproduction than CO (CO2:H2O2 ratio = 6.89 ± 1.64), and will lead to constrained estimates for global CO2 photochemical fluxes.

Subjects/Keywords: Photochemistry; dissolved organic carbon; apparent quantum yield; colored dissolved organic matter; carbon dioxide; carbon monoxide; hydrogen peroxide; superoxide; ocean color

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APA (6^th Edition):

Powers, L. (2015). Probing the photochemical reactivity of oceanic dissolved organic carbon. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/31492

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Powers, Leanne. “Probing the photochemical reactivity of oceanic dissolved organic carbon.” 2015. Thesis, University of Georgia. Accessed March 08, 2021. http://hdl.handle.net/10724/31492.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Powers, Leanne. “Probing the photochemical reactivity of oceanic dissolved organic carbon.” 2015. Web. 08 Mar 2021.

Vancouver:

Powers L. Probing the photochemical reactivity of oceanic dissolved organic carbon. [Internet] [Thesis]. University of Georgia; 2015. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10724/31492.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Powers L. Probing the photochemical reactivity of oceanic dissolved organic carbon. [Thesis]. University of Georgia; 2015. Available from: http://hdl.handle.net/10724/31492

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

17. Egea Tinoco, Luis Gonzalo. Carbon metabolism and dissolved organic carbon (DOC) fluxes on seagrass communities: insights from plant colonization states, eutrophication and global change related factors: Metabolismo de carbono y flujos de carbono orgánico disuelto (COD) en comunidades de angiospermas marinas: dependencia del estadío de colonización, eutrofización y factores relacionados con el cambio global.

Degree: 2017, Universidad de Cádiz

URL: http://hdl.handle.net/10498/22832

► Coastal vegetated communities are among the most productive ecosystems on Earth. Their role in the global carbon cycle and how they cope with global change… (more)

▼ Coastal vegetated communities are among the most productive ecosystems on Earth. Their role in the global carbon cycle and how they cope with global change may be more relevant than previously believed. They export large quantities of matter, both in particulate and dissolved forms to adjacent communities. Dissolved organic carbon (DOC) flux play a central role in the marine carbon cycle as an important driver of primary production for other compartments of the food web. While there has been extensive research on DOC dynamics in the open ocean, the role of coastal ecosystems in the global DOC cycle is still inadequately understood, even though these habitats tend to accumulate large amounts of DOC. Few studies have examined the DOC fluxes by marine macrophytic communities (macroalgae and seagrasses) under in situ approaches to determine their overall contribution in the whole system and their subsequent exchange with adjacent communities. Moreover, coastal vegetated communities, especially those dominated by seagrasses, are currently considered one of the most threatened ecosystems on Earth because of anthropogenic pressures, including nutrient increase and climate change. Thus, the overall objective of this Thesis was to evaluate the carbon metabolism and DOC fluxes in communities dominated by seagrasses and elucidate the effects of human–induced disturbances on the carbon dynamics of the community. The results of this Thesis showed that macrophytic communities are highly autotrophic, with large and variable contributions of their different components of the community, and a DOC source for the plankton community. Increase in nutrients concentration triggered that the communites dominated by the macroalge Caulerpa prolifera and the seagrass Cymodocea nodosa moved from autotrophy to heterotrophy in certain seasons of the year and could increase or decrease the DOC release. The response of seagrass communities when subjected to a pH decrease was complex and showed to be species-specific. The pH decrease triggered a significant increase in gross primary production (GPP) and community respiration (R) in seagrasses, which was translated into sucrose increase in aboveground tissues rather than a higher DOC release. Water temperature was the stressor that had a higher positive effect on carbon metabolism, yielding higher seagrass productivity, growth and DOC release. A direct relationship between productivity increase and larger DOC release was found in communities dominated by seagrasses. In addition, a high correlation between DOC release and both water temperature and current velocity was found. This Thesis demonstrated that climatic change and to some extent nutrient enrichment in coastal areas may not be so detrimental than previously believed at least for temperate seagrasses, and even may benefit the productivity and resistance of some temperate species (e.g. Cymodocea nodosa) in the future. The results of this Thesis underline the high productivity of vegetated coastal … Advisors/Committee Members: Brun, Fernando G. (advisor), Hernández Carrero, Ignacio (advisor), Biología (other).

Subjects/Keywords: seagrass; macrophytes; carbon cycle; dissolved organic carbon; global change

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APA (6^th Edition):

Egea Tinoco, L. G. (2017). Carbon metabolism and dissolved organic carbon (DOC) fluxes on seagrass communities: insights from plant colonization states, eutrophication and global change related factors: Metabolismo de carbono y flujos de carbono orgánico disuelto (COD) en comunidades de angiospermas marinas: dependencia del estadío de colonización, eutrofización y factores relacionados con el cambio global. (Thesis). Universidad de Cádiz. Retrieved from http://hdl.handle.net/10498/22832

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Egea Tinoco, Luis Gonzalo. “Carbon metabolism and dissolved organic carbon (DOC) fluxes on seagrass communities: insights from plant colonization states, eutrophication and global change related factors: Metabolismo de carbono y flujos de carbono orgánico disuelto (COD) en comunidades de angiospermas marinas: dependencia del estadío de colonización, eutrofización y factores relacionados con el cambio global.” 2017. Thesis, Universidad de Cádiz. Accessed March 08, 2021. http://hdl.handle.net/10498/22832.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Egea Tinoco, Luis Gonzalo. “Carbon metabolism and dissolved organic carbon (DOC) fluxes on seagrass communities: insights from plant colonization states, eutrophication and global change related factors: Metabolismo de carbono y flujos de carbono orgánico disuelto (COD) en comunidades de angiospermas marinas: dependencia del estadío de colonización, eutrofización y factores relacionados con el cambio global.” 2017. Web. 08 Mar 2021.

Vancouver:

Egea Tinoco LG. Carbon metabolism and dissolved organic carbon (DOC) fluxes on seagrass communities: insights from plant colonization states, eutrophication and global change related factors: Metabolismo de carbono y flujos de carbono orgánico disuelto (COD) en comunidades de angiospermas marinas: dependencia del estadío de colonización, eutrofización y factores relacionados con el cambio global. [Internet] [Thesis]. Universidad de Cádiz; 2017. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10498/22832.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Egea Tinoco LG. Carbon metabolism and dissolved organic carbon (DOC) fluxes on seagrass communities: insights from plant colonization states, eutrophication and global change related factors: Metabolismo de carbono y flujos de carbono orgánico disuelto (COD) en comunidades de angiospermas marinas: dependencia del estadío de colonización, eutrofización y factores relacionados con el cambio global. [Thesis]. Universidad de Cádiz; 2017. Available from: http://hdl.handle.net/10498/22832

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cornell University

18. Melvin, April. Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests.

Degree: PhD, Ecology, 2012, Cornell University

URL: http://hdl.handle.net/1813/29212

► Carbon (C), nitrogen (N), and calcium (Ca) cycling in forest ecosystems is controlled largely by the recycling of organic matter by biota and by the… (more)

▼ Carbon (C), nitrogen (N), and calcium (Ca) cycling in forest ecosystems is controlled largely by the recycling of organic matter by biota and by the balance of new inputs and losses. In the northeastern U.S., the availability of these elements has been dramatically altered by human activities. Acid deposition has increased N inputs and caused declines in soil Ca concentrations. Concurrently, atmospheric carbon dioxide concentrations are rising. My dissertation research focused on understanding how individual tree species influence ecosystem C, N, and Ca cycling, and how increasing soil Ca by liming affects C and N pools, fluxes, and dissolved organic matter retention. In chapter 1, I show how Norway spruce, red oak, and sugar maple planted in a common garden influence soil C, N, and Ca pools. Norway spruce had the largest C and N stocks in the forest floor and upper mineral soils. No differences among species were observed in soil exchangeable Ca availability. Red oak plots displayed the highest foliar litter lignin concentrations, the shortest residence time for C and N in the forest floor, and the highest earthworm densities. This suggests that leaf litter recalcitrance is not the dominant driver of decomposition in this forest and that other factors, such as the presence of earthworms, can influence organic matter turnover in ways that are unexpected when only considering litter chemistry. In chapters 2 and 3, I discuss the long-term effects of liming on ecosystem C and N dynamics. Twenty years after lime addition, there was no evidence of a tree response. Within the forest floor, C and N stocks in limed soils were double that found in controls. I observed reductions in both soil basal respiration and net N mineralization, indicating that liming has altered C and N cycling within this ecosystem. I also investigated how soil exchangeable Ca concentrations influence dissolved organic C and N retention. Soils higher in exchangeable Ca tended to release less C and N, suggesting that liming may facilitate Ca-organic matter bridging, thereby reducing C and N losses from the upper mineral soils. Advisors/Committee Members: Goodale, Christine L (chair), Fahey, Timothy James (committee member).

Subjects/Keywords: forest; soils; carbon; nitrogen; calcium; nitrogen; dissolved organic carbon; tree species

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APA (6^th Edition):

Melvin, A. (2012). Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/29212

Chicago Manual of Style (16^th Edition):

Melvin, April. “Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests.” 2012. Doctoral Dissertation, Cornell University. Accessed March 08, 2021. http://hdl.handle.net/1813/29212.

MLA Handbook (7^th Edition):

Melvin, April. “Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests.” 2012. Web. 08 Mar 2021.

Vancouver:

Melvin A. Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests. [Internet] [Doctoral dissertation]. Cornell University; 2012. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1813/29212.

Council of Science Editors:

Melvin A. Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests. [Doctoral Dissertation]. Cornell University; 2012. Available from: http://hdl.handle.net/1813/29212

Vanderbilt University

19. Mei, Yi. Hydrological Regulation on Dissolved Organic Carbon Transport from Agricultural and Forest Soils to Streams.

Degree: PhD, Environmental Engineering, 2013, Vanderbilt University

URL: http://hdl.handle.net/1803/12693

► Riparian top soil layer, rich in organic carbon, act as a source provider of dissolved organic carbon (DOC) to its adjacent stream, but the hydrological… (more)

▼ Riparian top soil layer, rich in organic carbon, act as a source provider of dissolved organic carbon (DOC) to its adjacent stream, but the hydrological factors that control the dynamics of DOC from terrestrial sources to the stream are not well characterized so far. The purpose of this study is to answer the questions and test the hypotheses regarding the control of hydrology on DOC transport and delivery from the terrestrial sources to the stream. The study site is White Clay Creek watershed, located in southeastern Pennsylvania. A field experiment, observation and mathematical model in a combined approach was used in this dissertation work to achieve our goal. Three physically-based hydrological models were developed. These models were integrated dual-permeability one dimensional soil core model; Two dimensional hillslope finite element model and a physically-based, distributed catchment model. Various numerical schemes were used to solve the related partial differential equations and ordinary differential equations, including finite different method, finite-element method and finite volume method. Models were calibrated against the data collected in the field after been built. Model uncertainties were evaluated using standard inverse modeling techniques. Monte Carlo simulation was used to explore the control of the hydrological factors on the discharge-DOC concentration relationship of the watershed. The results suggest that the subsurface contribution of DOC accounts for about 72% of the total annual export from the watershed, and the riparian zone contributes more than 90% of total DOC in groundwater. Our results also suggest that the duration of the flood wave and hydraulic property of the riparian soil play an important role in controlling the lag time between peak stream stage and peak DOC concentration from the hillslope to the adjacent stream. Advisors/Committee Members: Louis A. Kaplan (committee member), Prodyot K Basu (committee member), David Jon Furbish (committee member), David Kosson (committee member), George M. Hornberger (Committee Chair).

Subjects/Keywords: carbon cycle; reactive transport modeling; hydrological modeling; dissolved organic carbon

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APA (6^th Edition):

Mei, Y. (2013). Hydrological Regulation on Dissolved Organic Carbon Transport from Agricultural and Forest Soils to Streams. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12693

Chicago Manual of Style (16^th Edition):

Mei, Yi. “Hydrological Regulation on Dissolved Organic Carbon Transport from Agricultural and Forest Soils to Streams.” 2013. Doctoral Dissertation, Vanderbilt University. Accessed March 08, 2021. http://hdl.handle.net/1803/12693.

MLA Handbook (7^th Edition):

Mei, Yi. “Hydrological Regulation on Dissolved Organic Carbon Transport from Agricultural and Forest Soils to Streams.” 2013. Web. 08 Mar 2021.

Vancouver:

Mei Y. Hydrological Regulation on Dissolved Organic Carbon Transport from Agricultural and Forest Soils to Streams. [Internet] [Doctoral dissertation]. Vanderbilt University; 2013. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1803/12693.

Council of Science Editors:

Mei Y. Hydrological Regulation on Dissolved Organic Carbon Transport from Agricultural and Forest Soils to Streams. [Doctoral Dissertation]. Vanderbilt University; 2013. Available from: http://hdl.handle.net/1803/12693

University of Maine

20. Wei, Xinyuan. A Synthesis Program: Reducing Uncertainties of the Terrestrial Biosphere Carbon Cycle at Various Spatio Temporal Scales.

Degree: PhD, Forest Resources, 2020, University of Maine

URL: https://digitalcommons.library.umaine.edu/etd/3173

► The terrestrial biosphere plays an important role in the global carbon cycle, and disturbance fire and climate extreme drought have strong direct and indirect… (more)

▼ The terrestrial biosphere plays an important role in the global carbon cycle, and disturbance fire and climate extreme drought have strong direct and indirect impacts on the carbon fluxes. In addition, the lateral dissolved organic carbon (DOC) flux from soils to inland waters represents an important component of the terrestrial biosphere carbon cycle. Fires play an important role in the terrestrial biosphere carbon cycle, not only through direct carbon release but also contributing to a potential long-term storage as pyrogenic carbon (PyC). PyC is formed through fires, and because it may resist further biological and chemical degradation, is more stable in soil and sediment than original biomass. Chapter 1 presents estimates of global PyC production. Worldwide, droughts are becoming more frequent with increasing weather extremes, resulting in substantial impacts on land-atmosphere carbon exchange. However, the patterns of carbon fluxes in response to droughts differ across biomes and time scales due to variations in the adaptation and resilience of different plant species, soil properties, and available water and nutrients. In chapter 2, I examined the biome-scale spatial patterns in the response of carbon fluxes to droughts at different time scales. The export of dissolved organic carbon (DOC) from a watershed is a critical flux of terrestrial biosphere carbon cycles. Advanced understanding of how environmental factors drive the temporal patterns of this biogeochemical process and their relative magnitudes of impacts is necessary to accurately model and evaluate terrestrial carbon storage and fluxes. In chapter 3, I examined the impacts of environmental factors on the temporal patterns of DOC export and their relative magnitudes, as well as the autocorrelation of DOC export. The lateral flux of dissolved organic carbon (DOC) from soils to inland waters and ultimately delivered to the ocean represents a fundamental component of the global carbon cycle. To estimate the production, delivery and potential fates of DOC flux from terrestrial through aquatic ecosystems to the ocean, I developed a process-based terrestrial-aquatic DOC fluxes model (TAF-DOC), which has the ability to estimate the spatial and temporal dynamics of DOC flux through incorporating various environmental factors. Advisors/Committee Members: Daniel Hayes, Aaron Weiskittel, Ivan Fernandez.

Subjects/Keywords: Carbon Cycle; Dissolved Organic Carbon; Drought; Fire; Terrestrial Biosphere Model; Biogeochemistry

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APA (6^th Edition):

Wei, X. (2020). A Synthesis Program: Reducing Uncertainties of the Terrestrial Biosphere Carbon Cycle at Various Spatio Temporal Scales. (Doctoral Dissertation). University of Maine. Retrieved from https://digitalcommons.library.umaine.edu/etd/3173

Chicago Manual of Style (16^th Edition):

Wei, Xinyuan. “A Synthesis Program: Reducing Uncertainties of the Terrestrial Biosphere Carbon Cycle at Various Spatio Temporal Scales.” 2020. Doctoral Dissertation, University of Maine. Accessed March 08, 2021. https://digitalcommons.library.umaine.edu/etd/3173.

MLA Handbook (7^th Edition):

Wei, Xinyuan. “A Synthesis Program: Reducing Uncertainties of the Terrestrial Biosphere Carbon Cycle at Various Spatio Temporal Scales.” 2020. Web. 08 Mar 2021.

Vancouver:

Wei X. A Synthesis Program: Reducing Uncertainties of the Terrestrial Biosphere Carbon Cycle at Various Spatio Temporal Scales. [Internet] [Doctoral dissertation]. University of Maine; 2020. [cited 2021 Mar 08]. Available from: https://digitalcommons.library.umaine.edu/etd/3173.

Council of Science Editors:

Wei X. A Synthesis Program: Reducing Uncertainties of the Terrestrial Biosphere Carbon Cycle at Various Spatio Temporal Scales. [Doctoral Dissertation]. University of Maine; 2020. Available from: https://digitalcommons.library.umaine.edu/etd/3173

University of Edinburgh

21. Ridley, Luke McDonald. Study of dissolved organic matter in peatlands : molecular characterisation of a dynamic carbon reservoir.

Degree: PhD, 2014, University of Edinburgh

URL: http://hdl.handle.net/1842/9772

► Northern peatlands represent a significant carbon reservoir, containing approximately a third of the terrestrial carbon pool. The stability of these carbon stores is poorly understood,… (more)

▼ Northern peatlands represent a significant carbon reservoir, containing approximately a third of the terrestrial carbon pool. The stability of these carbon stores is poorly understood, and processes of accumulation and degradation appear to be finely balanced. Over the last decade, it has become increasingly clear that losses of dissolved organic carbon (DOC) from peatlands can be of considerable size and this flux appears to have increased substantially over the last 20 years. Despite its significance, the chemical composition of peatland-derived DOC remains poorly understood. This study aimed to characterise dissolved organic matter (DOM) at the molecular level using a novel combination of techniques. The study site (Cors Fochno, Wales, UK) is an ombrotrophic bog on which a number of studies into carbon cycling and hydrology have been carried out, providing a useful context for this project. The size and compositions of the DOC pool was monitored over 18 months, from three banks of piezometers, sampling from depths of 15 cm to 6 m. DOM which is representative of bog runoff was also monitored. DOC concentrations varied considerably between locations, spanning an order of magnitude (11.4 to 114 mgC l-1). Several relationships between DOC concentration and environmental and physical factors were established: DOC levels near the surface of the peatland varied with temperature, those in the runoff were most affected by recent rainfall events and the apparent DOC concentration at depth was related to the hydraulic conductivity of peat at that depth. The annual flux of DOC from the site was estimated at 113 tonnes, or 17.4 gC m-2. Only a small portion of the DOC pool could be characterised by analysis of dissolved combined amino acids (DCAA) and dissolved carbohydrates (as neutral sugars). Non-protein amino acids were most abundant in runoff samples, suggesting microbial reworking of DOM on entering drainage systems. DCAA yields decreased with depth, and the DCAA pool in deeper peat layers was characterised by more hydrophobic compounds. Interpretation of semi-quantitative results from TMAH thermochemolysis GC-MS analysis suggested oxidative degradation of organic matter near the surface of the peatland and photochemical degradation where DOM entered drainage networks, and this was supported by novel interpretation of results from ultrahigh resolution mass spectrometry analysis. The deepest porewaters were dominated by nalkanes, with notable contributions from fatty acids, suggesting a plant wax source for this DOM. The highest DOC concentrations were found at intermediate depth from a site midway between the centre of the bog and the southern boundary where hydraulic conductivities were low, and DOM from these piezometers were characterised by high contributions from a suite of phenolic compounds (with mainly para-hydroxyphenyl structures). These compounds have been linked to Sphagnum species, and are known to be functionally important to the development and maintenance of the unusual chemical environment in peatlands…

Subjects/Keywords: 628.1; dissolved organic carbon; DOC; raised bog; peatland carbon

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APA (6^th Edition):

Ridley, L. M. (2014). Study of dissolved organic matter in peatlands : molecular characterisation of a dynamic carbon reservoir. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/9772

Chicago Manual of Style (16^th Edition):

Ridley, Luke McDonald. “Study of dissolved organic matter in peatlands : molecular characterisation of a dynamic carbon reservoir.” 2014. Doctoral Dissertation, University of Edinburgh. Accessed March 08, 2021. http://hdl.handle.net/1842/9772.

MLA Handbook (7^th Edition):

Ridley, Luke McDonald. “Study of dissolved organic matter in peatlands : molecular characterisation of a dynamic carbon reservoir.” 2014. Web. 08 Mar 2021.

Vancouver:

Ridley LM. Study of dissolved organic matter in peatlands : molecular characterisation of a dynamic carbon reservoir. [Internet] [Doctoral dissertation]. University of Edinburgh; 2014. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1842/9772.

Council of Science Editors:

Ridley LM. Study of dissolved organic matter in peatlands : molecular characterisation of a dynamic carbon reservoir. [Doctoral Dissertation]. University of Edinburgh; 2014. Available from: http://hdl.handle.net/1842/9772

NSYSU

22. Guo, Ruei-Long. A Preliminary Study on the Contribution of Methane-derived Carbon to the Carbon Pools in Near-surface Sediment and Bottom Water: An Example from the Cold Seep Region of the Four-Way Closure Ridge, Offshore Southwestern Taiwan.

Degree: Master, Department of Oceanography, 2015, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1009115-154428

► Marine sediment is one of the largest methane reservoirs on Earth. Nevertheless, very little of the methane reaches seawater or the atmosphere because of consumption… (more)

▼ Marine sediment is one of the largest methane reservoirs on Earth. Nevertheless, very little of the methane reaches seawater or the atmosphere because of consumption by methane oxidation, especially anaerobic processes, as methane diffuses up through the sediments. How the products of methane oxidation affect carbon budgets in marine environments remains a topic of intensive study. In the present work, we employed two approaches, stable isotope probing experiments and analysis of environmental samples, to assess how methane-derived carbon contributes to the carbon pools in near-surface sediments and bottom seawater. Samples were retrieved from the cold-seep region of the Four-Way Closure Ridge offshore SW Taiwan with video-assisted sampling tools. The stable isotope probing experiments revealed strong aerobic methane oxidizing activities with a potential rate of 11.9 Î¼mol Lâ1 dâ1. The conversion efficiency of methane into other carbon pools decreased in the order of dissolved inorganic carbon (DIC)>dissolved organic carbon>particulate organic carbon. Analysis of environmental samples showed that the near-surface sediment at the seep site had substantial 13C-depletion in all carbon pools (DIC, dissolved organic carbon, and total organic carbon) compared to the reference site sediment, indicating microbial uptake of 13C-depleted dissolved carbon ascending from the underlying sulfate-methane transition zone. The bottom seawater of the seep site also had DIC 2.5â° more depleted in 13C than that of the reference site. Mass balance calculation showed that a small fraction (0.2â1.1%) of methane-derived DIC was enough to account for the 13C depletion. These preliminary results suggest that the products generated by methane-oxidizing processes occurring tens of centimeters below seafloor can affect the carbon pools in the overlying, methane-deficient sediment and bottom water. Advisors/Committee Members: Li-Hung Lin (chair), Yu-Shih Lin (committee member), Chau-Chang Wang (chair).

Subjects/Keywords: Four-Way Closure Ridge; cold seeps; methane-derived carbon; SIP; stable carbon isotopes; dissolved inorganic carbon; dissolved organic carbon; particulate organic carbon; total organic carbon

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APA (6^th Edition):

Guo, R. (2015). A Preliminary Study on the Contribution of Methane-derived Carbon to the Carbon Pools in Near-surface Sediment and Bottom Water: An Example from the Cold Seep Region of the Four-Way Closure Ridge, Offshore Southwestern Taiwan. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1009115-154428

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Guo, Ruei-Long. “A Preliminary Study on the Contribution of Methane-derived Carbon to the Carbon Pools in Near-surface Sediment and Bottom Water: An Example from the Cold Seep Region of the Four-Way Closure Ridge, Offshore Southwestern Taiwan.” 2015. Thesis, NSYSU. Accessed March 08, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1009115-154428.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Guo, Ruei-Long. “A Preliminary Study on the Contribution of Methane-derived Carbon to the Carbon Pools in Near-surface Sediment and Bottom Water: An Example from the Cold Seep Region of the Four-Way Closure Ridge, Offshore Southwestern Taiwan.” 2015. Web. 08 Mar 2021.

Vancouver:

Guo R. A Preliminary Study on the Contribution of Methane-derived Carbon to the Carbon Pools in Near-surface Sediment and Bottom Water: An Example from the Cold Seep Region of the Four-Way Closure Ridge, Offshore Southwestern Taiwan. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Mar 08]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1009115-154428.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Guo R. A Preliminary Study on the Contribution of Methane-derived Carbon to the Carbon Pools in Near-surface Sediment and Bottom Water: An Example from the Cold Seep Region of the Four-Way Closure Ridge, Offshore Southwestern Taiwan. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1009115-154428

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Florida International University

23. Roebuck, J. Alan, Jr. Environmental Dynamics of Dissolved Organic Matter and Dissolved Black Carbon in Fluvial Systems: Effects of Biogeochemistry and Land Use.

Degree: PhD, Chemistry, 2018, Florida International University

URL: https://digitalcommons.fiu.edu/etd/3755 ; 10.25148/etd.FIDC006880 ; FIDC006880

► Black carbon (BC) is an organic residue formed primarily from biomass burning (e.g., wildfires) and fossil fuel combustion. Until recently, it was understood that… (more)

▼ Black carbon (BC) is an organic residue formed primarily from biomass burning (e.g., wildfires) and fossil fuel combustion. Until recently, it was understood that BC was highly recalcitrant and stabilized in soils over millennial scales. However, a fraction of the material can be solubilized and transported in fluvial systems as dissolved BC (DBC), which represents on average 10% of the global export of dissolved organic carbon (DOC) from rivers to coastal systems. The composition of DBC controls its reactivity, and it has been linked with a variety of in-stream processes that induce both carbon sequestration and evasion of CO₂ from aquatic systems, which suggest DBC may have a significant contribution within the global carbon cycle. The primary objectives for the thesis were to elucidate environmental factors that control the fate and transport of DBC in fluvial systems. Ultra-high resolution mass spectrometry was used to characterize DBC on a molecular scale whereas benzenepolycarboxylic acids were used to quantify and characterize BC in both dissolved and particulate phases (PBC). Sinks for polycondensed DBC were linked to a series of in-stream biogeochemical processes (e.g., photodegradation, metal interactions); whereas photooxidation of particulate charcoal led to production of DBC, suggesting photodissolution as a previously unrecognized source of DBC to fluvial systems. Coupling of DBC with PBC, however, was hydrologically constrained with sources varying over temporal scales and land use regimes. For DBC in particular, an enrichment of heteroatomic functionality was observed as a function of anthropogenic land use. Furthermore, land use coupled with stream order (a proxy for in-stream processing as defined by the River Continuum Concept) could explain significant spatial variability in organic matter (e.g., DOC) composition within an anthropogenically impacted system. With an increase in wildfire frequency projected with on-going climate change trends, parallel projections for increases in BC production are also expected. Furthermore, conversion of natural landscapes for urban and agricultural practices is also expected to continue in the coming decades. Thus, it is imperative to reach a comprehensive understanding of processes regulating the transport of DBC in fluvial systems with efforts to constrain future BC budgets and climate change models. Advisors/Committee Members: Rudolf Jaffé, Yong Cai, Piero Gardinali, Anthony DeCaprio, John Kominoski.

Subjects/Keywords: Dissolved Black Carbon; Dissolved Organic Matter; Rivers; Biogeochemistry; Land Use; Biogeochemistry; Environmental Chemistry; Hydrology

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APA (6^th Edition):

Roebuck, J. Alan, J. (2018). Environmental Dynamics of Dissolved Organic Matter and Dissolved Black Carbon in Fluvial Systems: Effects of Biogeochemistry and Land Use. (Doctoral Dissertation). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/3755 ; 10.25148/etd.FIDC006880 ; FIDC006880

Chicago Manual of Style (16^th Edition):

Roebuck, J. Alan, Jr. “Environmental Dynamics of Dissolved Organic Matter and Dissolved Black Carbon in Fluvial Systems: Effects of Biogeochemistry and Land Use.” 2018. Doctoral Dissertation, Florida International University. Accessed March 08, 2021. https://digitalcommons.fiu.edu/etd/3755 ; 10.25148/etd.FIDC006880 ; FIDC006880.

MLA Handbook (7^th Edition):

Roebuck, J. Alan, Jr. “Environmental Dynamics of Dissolved Organic Matter and Dissolved Black Carbon in Fluvial Systems: Effects of Biogeochemistry and Land Use.” 2018. Web. 08 Mar 2021.

Vancouver:

Roebuck, J. Alan J. Environmental Dynamics of Dissolved Organic Matter and Dissolved Black Carbon in Fluvial Systems: Effects of Biogeochemistry and Land Use. [Internet] [Doctoral dissertation]. Florida International University; 2018. [cited 2021 Mar 08]. Available from: https://digitalcommons.fiu.edu/etd/3755 ; 10.25148/etd.FIDC006880 ; FIDC006880.

Council of Science Editors:

Roebuck, J. Alan J. Environmental Dynamics of Dissolved Organic Matter and Dissolved Black Carbon in Fluvial Systems: Effects of Biogeochemistry and Land Use. [Doctoral Dissertation]. Florida International University; 2018. Available from: https://digitalcommons.fiu.edu/etd/3755 ; 10.25148/etd.FIDC006880 ; FIDC006880

University of Minnesota

24. Steinbring, Carla Jean. High-resolution electrospray ionization mass spectrometry for molecular level characterization of dissolved natural organic matter in the Lake Superior watershed.

Degree: MS, Chemistry, 2010, University of Minnesota

URL: http://purl.umn.edu/102464

►

University of Minnesota M.S. thesis. August 2010. Major: Chemistry. Advisor: Dr. Elizabeth C. Minor. 1 computer file (PDF); v, 71 pages.

Recent studies have begun… (more)

Subjects/Keywords: Molecular-level; Dissolved organic matter (DOM); Salt-water; Carbon cycle; Organic carbon; Biogeochemical transformations; Chemistry

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APA (6^th Edition):

Steinbring, C. J. (2010). High-resolution electrospray ionization mass spectrometry for molecular level characterization of dissolved natural organic matter in the Lake Superior watershed. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/102464

Chicago Manual of Style (16^th Edition):

Steinbring, Carla Jean. “High-resolution electrospray ionization mass spectrometry for molecular level characterization of dissolved natural organic matter in the Lake Superior watershed.” 2010. Masters Thesis, University of Minnesota. Accessed March 08, 2021. http://purl.umn.edu/102464.

MLA Handbook (7^th Edition):

Steinbring, Carla Jean. “High-resolution electrospray ionization mass spectrometry for molecular level characterization of dissolved natural organic matter in the Lake Superior watershed.” 2010. Web. 08 Mar 2021.

Vancouver:

Steinbring CJ. High-resolution electrospray ionization mass spectrometry for molecular level characterization of dissolved natural organic matter in the Lake Superior watershed. [Internet] [Masters thesis]. University of Minnesota; 2010. [cited 2021 Mar 08]. Available from: http://purl.umn.edu/102464.

Council of Science Editors:

Steinbring CJ. High-resolution electrospray ionization mass spectrometry for molecular level characterization of dissolved natural organic matter in the Lake Superior watershed. [Masters Thesis]. University of Minnesota; 2010. Available from: http://purl.umn.edu/102464

Texas A&M University

25. Chen, Jie. Factors Affecting Carbohydrate Production and the Formation of Transparent Exopolymer Particles (TEP) by Diatoms.

Degree: PhD, Oceanography, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/152546

► Diatoms exude large amounts of exopolymers (EPS), which are predominantly composed of carbohydrates. EPS may coagulate into transparent exopolymer particles (TEP). Sticky TEP affects the… (more)

▼ Diatoms exude large amounts of exopolymers (EPS), which are predominantly composed of carbohydrates. EPS may coagulate into transparent exopolymer particles (TEP). Sticky TEP affects the formation of aggregates and marine snow, and consequently, the efficiency of the biological carbon pump. The objective of this research was to determine how different factors affect carbohydrate production and the formation of TEP by diatoms, and their role in aggregation. Diatoms were grown in laboratory cultures to test the hypothesis that stress increases the cell membrane permeability and subsequently enhances TEP formation. In addition, an experiment was conducted to compare the effect of oxidative stress on both a diatom (Thalassiosira weissflogii) and a cyanobacterium (Synechococcus elongates). For some diatoms (Thalassiosira weissflogii and Skeletonema marinoi) and the cyanobacterium Synechococcus elongatus, TEP formation was associated with permeable cells. Greater TEP production was observed in cultures under stress conditions (higher temperature, nutrient limitation, and oxidative stress), and more dissolved extracellular carbohydrate was released by dying cells. In the contrast, TEP formation by Cylindrotheca closterium was associated with healthy cells. More dissolved extracellular carbohydrate produced by healthy cells, rather than permeable cells. Therefore, my results indicate that carbohydrate production is important for TEP formation. Stress causes cell leakage, but TEP formation is a complex process. Cell leakage does not always result in the release of dissolved extracellular carbohydrate and enhanced TEP production. In addition, this study investigated the relationship between TEP and aggregate formation. Higher temperature increased TEP production, which was associated with greater aggregation in cultures of S. marinoi, but not in T. weissflogii. Therefore, enhanced TEP production by diatoms does not always affect aggregate formation. This research indicates that environmental factors affect carbohydrate and TEP production by diatoms, and consequently influences aggregate formation. These influences have a profound impact on biogeochemical cycling of carbon. Advisors/Committee Members: Thornton, Daniel C. O. (advisor), Yang, Guanpin (advisor), Tice, Mike (committee member), Quigg, Antonietta (committee member).

Subjects/Keywords: Coomassie Staining Particles; Dissolved organic carbon; Extracellular polymeric substances; Particular organic carbon; Transparent exopolymer particle

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APA (6^th Edition):

Chen, J. (2014). Factors Affecting Carbohydrate Production and the Formation of Transparent Exopolymer Particles (TEP) by Diatoms. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152546

Chicago Manual of Style (16^th Edition):

Chen, Jie. “Factors Affecting Carbohydrate Production and the Formation of Transparent Exopolymer Particles (TEP) by Diatoms.” 2014. Doctoral Dissertation, Texas A&M University. Accessed March 08, 2021. http://hdl.handle.net/1969.1/152546.

MLA Handbook (7^th Edition):

Chen, Jie. “Factors Affecting Carbohydrate Production and the Formation of Transparent Exopolymer Particles (TEP) by Diatoms.” 2014. Web. 08 Mar 2021.

Vancouver:

Chen J. Factors Affecting Carbohydrate Production and the Formation of Transparent Exopolymer Particles (TEP) by Diatoms. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1969.1/152546.

Council of Science Editors:

Chen J. Factors Affecting Carbohydrate Production and the Formation of Transparent Exopolymer Particles (TEP) by Diatoms. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152546

NSYSU

26. Pan, Pei-Yi. Distributions and variations of dissolved organic carbon in the Taiwan Strait and Taiwanese rivers.

Degree: Master, Marine Geology and chemistry, 2012, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-170554

► Dissolved organic carbon (DOC) is one of the largest pools of carbon in the ocean, and is of the same size as the carbon dioxide… (more)

▼ Dissolved organic carbon (DOC) is one of the largest pools of carbon in the ocean, and is of the same size as the carbon dioxide in the atmosphere. Estuaries connecting the land and the ocean are one of the most important DOC sources to the ocean, and play an important role in the global carbon cycle. Because of their complex chemical, physical, geological and biological properties, estuaries have become rich ecological environment. In this study, we investigated the seasonal distributions of DOC in the Taiwan Strait (TS) and Taiwanese rivers, aiming to understand the distributions and variations of DOC in different seasons. The results show that DOC concentrations are generally the highest in the upper estuary, and then decrease downstream due to mixing with the low DOC seawater. The process of river flow constantly accumulates terrestrial material, and the DOC shows positive correlations with Chl. a, CH4 and BOD (Biochemical Oxygen Demand), suggesting that biological activities and pollutions could be sources of DOC in the estuary. The DOC concentrations (salinity<1) varied in dry (Nov.-Apr.) and wet (May-Oct.) seasons with ranges of 42-1185 Î¼M (mean=245Â±254Î¼M; n=32) and 18-565 Î¼M (mean=183Â±151Î¼M; n=24), respectively. The total DOC flux of 25 rivers is 87.8 Gg C/yr, which can be translated to the fluxes of all rivers in Taiwan to be 101.9 Gg C/yr. The amount of DOC flux in Taiwan is only about 0.07% of the tropical area, but the per unit area flux (3.92 gC /m2 /yr) is almost twice those of the tropical rivers (2.13 gC /m2 /yr). In Taiwan, the population density and land use are higher than the world average. Consequently, the impacts of the environment by human activities reveal the utmost export of DOC, and need further investigation. Next, in the TS, the DOC shows significant negative correlations with Sigma-T, and the distributions of DOC are mainly controlled by physical mixing in both winter and summer. In the western TS, DOC concentration is relatively high, compared to the eastern part, and is because of low temperature and salinity, but high DOC coastal China current flowing from north to south. DOC concentration decreases with increasing depth owing to the intrusion at depth by the Kuroshio, which contains relatively low DOC. In winter, the import of coastal China current brings more nutrients from north to south, and supports the growth of bacteria which depletes the DOC and oxygen. As the result, DOC decomposition rate is higher in winter than in summer. The TSâs DOC fluxes in summer (northern TS: 3.85Ã1012mol C/yrï¼southern TS: 3.75Ã1012mol C/yr) are higher than in winter (northern TS: 3.69Ã1012mol C/yrï¼southern TS: 2.84Ã1012mol C/yr). Main differences are due to the prevailing southwest monsoon winds in summer transporting more water from the South China Sea to the TS, and the river discharge brings more terrigenous organic matters into the TS. Therefore, the DOC export in summer is higher than in winter. Advisors/Committee Members: Lou, J.Y. (chair), Hung, J.J. (chair), Hung, C.C. (chair), Chen, C.T.A. (committee member), Wang, S. L. (chair).

Subjects/Keywords: flux; seasonal; Taiwan rivers; dissolved organic carbon; Taiwan Strait

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APA (6^th Edition):

Pan, P. (2012). Distributions and variations of dissolved organic carbon in the Taiwan Strait and Taiwanese rivers. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-170554

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pan, Pei-Yi. “Distributions and variations of dissolved organic carbon in the Taiwan Strait and Taiwanese rivers.” 2012. Thesis, NSYSU. Accessed March 08, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-170554.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pan, Pei-Yi. “Distributions and variations of dissolved organic carbon in the Taiwan Strait and Taiwanese rivers.” 2012. Web. 08 Mar 2021.

Vancouver:

Pan P. Distributions and variations of dissolved organic carbon in the Taiwan Strait and Taiwanese rivers. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Mar 08]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-170554.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pan P. Distributions and variations of dissolved organic carbon in the Taiwan Strait and Taiwanese rivers. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-170554

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universiteit Utrecht

27. Müller, Benjamin. Shedding light on DOC release by benthic primary producers and its consumption by bioeroding sponges.

Degree: 2015, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/327650

► The effect of light on dissolved organic carbon (DOC) release of benthic primary producers (BPPs) was investigated on the coral reefs of Curaçao. Incubation experiments… (more)

▼ The effect of light on dissolved organic carbon (DOC) release of benthic primary producers (BPPs) was investigated on the coral reefs of Curaçao. Incubation experiments revealed a positive relation between the DOC release of four Caribbean reef algae (Cladophora sp., Dictyota menstrualis, Lobophora variegata, turf algae) and light availability (light-driven DOC release). In contrast, the DOC release of two tested scleractinian coral species (Madracis mirabilis, Orbicella annularis) was either minimal or DOC uptake occurred independent of light availability. Complementary in situ measurements in close proximity to BPPs and the water column showed a positive correlation between DOC concentrations and light intensity. Furthermore, average DOC concentrations were twice as high during the sampling in May-June compared to the sampling in November-December. This can at least be partly explained by a significantly higher light availability in May-June. However, in situ DOC concentrations near the reef alga Dictyota sp. did not follow a natural light gradient from 5 to 20 m depth, suggesting that apart from light availability also other factors such as photoinhibition and water movement may affect DOC concentrations near BPPs. Additional incubations were performed with turf algae under elevated nutrient conditions. Interestingly, when additional nutrients were added, DOC release at low and high light intensities were similar (light-independent DOC release). The availability of nutrients therefore determined whether light-driven or light-independent DOC release occurred. Similar to reef algae benthic cyanobacterial mats (BCMs) displayed high DOC release rates in in situ incubations during the day. However, DOC release at night was more than twice that high. This DOC release in the dark is proposed to be the result of incomplete organic matter degradation and fermentation under anoxic conditions. When integrating the day and night DOC release over a 24 hrs diurnal cycle, BCMs (benthic cover: 24%) were estimated to release four times more DOC than reef algae (benthic cover: 36%). BCMs thereby display the highest contribution to the benthic DOC production (80%). Excavating sponges are the most important bioeroders on Caribbean reefs. If they, similar to other sponges, can directly feed on DOC, they may benefit from an increase in DOC production due to ongoing coral-algal phase shifts. Therefore, the potential DOC and bacterial uptake of the common excavating sponges Siphonodictyon sp. and Cliona delitrix were investigated in situ. Despite high bacterial retention efficiencies, both species relied mainly on the uptake of DOC to meet their carbon demand. This utilization of DOC indicates that excavating sponges might benefit from an increase in DOC production as result of coral-algal phase shifts. Advisors/Committee Members: Brinkhuis, Henk, van Duyl, F.C., Vermeij, M.J.A..

Subjects/Keywords: Dissolved organic carbon; algae; corals; excavating sponges; benthic cyanobacterial mats

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APA (6^th Edition):

Müller, B. (2015). Shedding light on DOC release by benthic primary producers and its consumption by bioeroding sponges. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/327650

Chicago Manual of Style (16^th Edition):

Müller, Benjamin. “Shedding light on DOC release by benthic primary producers and its consumption by bioeroding sponges.” 2015. Doctoral Dissertation, Universiteit Utrecht. Accessed March 08, 2021. http://dspace.library.uu.nl:8080/handle/1874/327650.

MLA Handbook (7^th Edition):

Müller, Benjamin. “Shedding light on DOC release by benthic primary producers and its consumption by bioeroding sponges.” 2015. Web. 08 Mar 2021.

Vancouver:

Müller B. Shedding light on DOC release by benthic primary producers and its consumption by bioeroding sponges. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2015. [cited 2021 Mar 08]. Available from: http://dspace.library.uu.nl:8080/handle/1874/327650.

Council of Science Editors:

Müller B. Shedding light on DOC release by benthic primary producers and its consumption by bioeroding sponges. [Doctoral Dissertation]. Universiteit Utrecht; 2015. Available from: http://dspace.library.uu.nl:8080/handle/1874/327650

University of Colorado

28. Ebert, Jessica L. Advances in Understanding the Contributions of Microbial Dissolved Organic Matter to the Fluorescence Signature of Natural Waters Using Parallel Factor Analysis.

Degree: MS, 2012, University of Colorado

URL: https://scholar.colorado.edu/cven_gradetds/265

► Dissolved organic matter (DOM) is present in all aquatic ecosystems and plays and important role in the global carbon cycle. DOM can be characterized using… (more)

Subjects/Keywords: dissolved organic matter; carbon cycle; factor analysis; fluorescence; Environmental Engineering

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APA (6^th Edition):

Ebert, J. L. (2012). Advances in Understanding the Contributions of Microbial Dissolved Organic Matter to the Fluorescence Signature of Natural Waters Using Parallel Factor Analysis. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/265

Chicago Manual of Style (16^th Edition):

Ebert, Jessica L. “Advances in Understanding the Contributions of Microbial Dissolved Organic Matter to the Fluorescence Signature of Natural Waters Using Parallel Factor Analysis.” 2012. Masters Thesis, University of Colorado. Accessed March 08, 2021. https://scholar.colorado.edu/cven_gradetds/265.

MLA Handbook (7^th Edition):

Ebert, Jessica L. “Advances in Understanding the Contributions of Microbial Dissolved Organic Matter to the Fluorescence Signature of Natural Waters Using Parallel Factor Analysis.” 2012. Web. 08 Mar 2021.

Vancouver:

Ebert JL. Advances in Understanding the Contributions of Microbial Dissolved Organic Matter to the Fluorescence Signature of Natural Waters Using Parallel Factor Analysis. [Internet] [Masters thesis]. University of Colorado; 2012. [cited 2021 Mar 08]. Available from: https://scholar.colorado.edu/cven_gradetds/265.

Council of Science Editors:

Ebert JL. Advances in Understanding the Contributions of Microbial Dissolved Organic Matter to the Fluorescence Signature of Natural Waters Using Parallel Factor Analysis. [Masters Thesis]. University of Colorado; 2012. Available from: https://scholar.colorado.edu/cven_gradetds/265

Brunel University

29. Onogbosele, Cyril Oziegbe. Bioavailability of organic contaminants in rivers.

Degree: PhD, 2015, Brunel University

URL: http://bura.brunel.ac.uk/handle/2438/11050 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655893

► In rivers, association of organic contaminants with dissolved organic carbon may limit freely dissolved or bioavailable fractions and toxicity of organic contaminants. Consequently, assessment of… (more)

Subjects/Keywords: 363.739; Ethinylestradiol; Perfluorooctane sulfonate; Hexabromocyclododecane; Dissolved organic carbon; Yeast estrogen screen

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APA (6^th Edition):

Onogbosele, C. O. (2015). Bioavailability of organic contaminants in rivers. (Doctoral Dissertation). Brunel University. Retrieved from http://bura.brunel.ac.uk/handle/2438/11050 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655893

Chicago Manual of Style (16^th Edition):

Onogbosele, Cyril Oziegbe. “Bioavailability of organic contaminants in rivers.” 2015. Doctoral Dissertation, Brunel University. Accessed March 08, 2021. http://bura.brunel.ac.uk/handle/2438/11050 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655893.

MLA Handbook (7^th Edition):

Onogbosele, Cyril Oziegbe. “Bioavailability of organic contaminants in rivers.” 2015. Web. 08 Mar 2021.

Vancouver:

Onogbosele CO. Bioavailability of organic contaminants in rivers. [Internet] [Doctoral dissertation]. Brunel University; 2015. [cited 2021 Mar 08]. Available from: http://bura.brunel.ac.uk/handle/2438/11050 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655893.

Council of Science Editors:

Onogbosele CO. Bioavailability of organic contaminants in rivers. [Doctoral Dissertation]. Brunel University; 2015. Available from: http://bura.brunel.ac.uk/handle/2438/11050 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655893

University of Lund

30. Panneer Selvam, Balathandayuthabani. Reactive dissolved organic carbon dynamics in a changing environment : Experimental evidence from soil and water.

Degree: 2016, University of Lund

URL: https://lup.lub.lu.se/record/24c68fe9-546b-4ac1-a4ba-e0448ab6afdb ; https://portal.research.lu.se/ws/files/12783847/Panneer_Selvam_kappa.pdf

► Dissolved organic carbon (DOC) is the major form of organic carbon in aquatic ecosystems. Biological and photochemical degradation of DOC are major causes of greenhouse… (more)

▼ Dissolved organic carbon (DOC) is the major form of organic carbon in aquatic ecosystems. Biological and photochemical degradation of DOC are major causes of greenhouse gas emissions from aquatic ecosystems. In response to current changes in climate, studies at different northern-hemisphere locations have shown both increases and decreases in total DOC export from land to water. However, there is lack of knowledge on the effect of changing environmental conditions on bio- and photo-degradation potentials. Therefore, this thesis aimed to combine empirical and experimental methods to determine the dynamics of DOC reactivity in response to key environmental parameters related to soil frost conditions and hydrology. I collected samples from the boreal region to carry out laboratory degradation experiments and to analyze the DOC degradation potentials in relation to environmental variables and intrinsic properties of the DOC.In a boreal forest region that has seasonal soil frost, the DOC bio-reactivity decreased with experimental reductions in the extent and duration of soil frost, while photo-reactivity remained constant. However, DOC from experimentally thawed permafrost peat in the subarctic north showed higher bio- and photo-degradation potentials than the DOC from active peat layers above the permafrost. The nature of the soil and intrinsic DOC properties explained these patterns in soil DOC reactivity. In the surface water network, bio-degradation was the dominant DOC degradation mechanism in brow-water lakes, while photo-degradation played a relatively larger role in clearer waters. The surface water photo-reactivity per unit of light absorption was high at both acidic and at alkaline conditions, while lower at intermediate pH, probably due to effects of the protonation state of DOC on photo-reactivity. Therefore, pH change along the aquatic network caused extrinsic control on the photo-reactivity at the landscape scale.In conclusion the results show that climate warming decreases the export of bio-reactive DOC in a boreal forest, but it likely increases the export of bio- and photo-reactive DOC in a permafrost peatland. In a wetter climate with shorter residence times, clear waters may experience browning and relative shift from photo-degradation to bio-degradation, while already brown lakes will remain brown and dominated by bio-degradation. Furthermore, the loss of photo reactive DOC during transport in aquatic network may be counter balanced by the changes in extrinsic variables such as pH.

Subjects/Keywords: Physical Geography; Dissolved organic carbon; DOC; Photodegradation; Biodegradation; DOC reactivity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Panneer Selvam, B. (2016). Reactive dissolved organic carbon dynamics in a changing environment : Experimental evidence from soil and water. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/24c68fe9-546b-4ac1-a4ba-e0448ab6afdb ; https://portal.research.lu.se/ws/files/12783847/Panneer_Selvam_kappa.pdf

Chicago Manual of Style (16^th Edition):

Panneer Selvam, Balathandayuthabani. “Reactive dissolved organic carbon dynamics in a changing environment : Experimental evidence from soil and water.” 2016. Doctoral Dissertation, University of Lund. Accessed March 08, 2021. https://lup.lub.lu.se/record/24c68fe9-546b-4ac1-a4ba-e0448ab6afdb ; https://portal.research.lu.se/ws/files/12783847/Panneer_Selvam_kappa.pdf.

MLA Handbook (7^th Edition):

Panneer Selvam, Balathandayuthabani. “Reactive dissolved organic carbon dynamics in a changing environment : Experimental evidence from soil and water.” 2016. Web. 08 Mar 2021.

Vancouver:

Panneer Selvam B. Reactive dissolved organic carbon dynamics in a changing environment : Experimental evidence from soil and water. [Internet] [Doctoral dissertation]. University of Lund; 2016. [cited 2021 Mar 08]. Available from: https://lup.lub.lu.se/record/24c68fe9-546b-4ac1-a4ba-e0448ab6afdb ; https://portal.research.lu.se/ws/files/12783847/Panneer_Selvam_kappa.pdf.

Council of Science Editors:

Panneer Selvam B. Reactive dissolved organic carbon dynamics in a changing environment : Experimental evidence from soil and water. [Doctoral Dissertation]. University of Lund; 2016. Available from: https://lup.lub.lu.se/record/24c68fe9-546b-4ac1-a4ba-e0448ab6afdb ; https://portal.research.lu.se/ws/files/12783847/Panneer_Selvam_kappa.pdf

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