subject:(oceanography)

Wilfrid Laurier University

1. Childs, Jayson A. Littoral Cells, Longshore Transport and Wave Climate: An Examination of Littoral Transport Along the Western Shore of Prince Edward County, Ontario.

Degree: 2010, Wilfrid Laurier University

URL: https://scholars.wlu.ca/etd/1107

► This study discusses the wave climate and potential littoral transport along the western shore of Prince Edward County approximately two hours east of Toronto along… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Childs, J. A. (2010). Littoral Cells, Longshore Transport and Wave Climate: An Examination of Littoral Transport Along the Western Shore of Prince Edward County, Ontario. (Thesis). Wilfrid Laurier University. Retrieved from https://scholars.wlu.ca/etd/1107

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):

Childs, Jayson A. “Littoral Cells, Longshore Transport and Wave Climate: An Examination of Littoral Transport Along the Western Shore of Prince Edward County, Ontario.” 2010. Thesis, Wilfrid Laurier University. Accessed September 22, 2019. https://scholars.wlu.ca/etd/1107.

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

MLA Handbook (7^th Edition):

Childs, Jayson A. “Littoral Cells, Longshore Transport and Wave Climate: An Examination of Littoral Transport Along the Western Shore of Prince Edward County, Ontario.” 2010. Web. 22 Sep 2019.

Vancouver:

Childs JA. Littoral Cells, Longshore Transport and Wave Climate: An Examination of Littoral Transport Along the Western Shore of Prince Edward County, Ontario. [Internet] [Thesis]. Wilfrid Laurier University; 2010. [cited 2019 Sep 22]. Available from: https://scholars.wlu.ca/etd/1107.

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

Council of Science Editors:

Childs JA. Littoral Cells, Longshore Transport and Wave Climate: An Examination of Littoral Transport Along the Western Shore of Prince Edward County, Ontario. [Thesis]. Wilfrid Laurier University; 2010. Available from: https://scholars.wlu.ca/etd/1107

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

University of Cape Town

2. Ramanantsoa, Heriniaina Juliano Dani. Variability of coastal upwelling south of Madagascar.

Degree: PhD, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29859

► Madagascar’s southern coastal marine zone is a region of high biological productivity which supports a wide range of marine ecosystems, including fisheries. This high biological… (more)

▼ Madagascar’s southern coastal marine zone is a region of high biological productivity which supports a wide range of marine ecosystems, including fisheries. This high biological productivity is attributed to coastal upwelling. The thesis seeks to characterise the variability of the coastal upwelling south of Madagascar. The first part of the thesis provides new insights on the structure, variability and drivers of the coastal upwelling south of Madagascar. Satellite remote sensing is used to characterize the spatial extent and strength of the coastal upwelling. A front detection algorithm is applied to thirteen years of Multi-scale Ultra-high Resolution (MUR) Sea Surface Temperatures (SST) and an upwelling index is calculated. The influence of winds and ocean currents as drivers of the upwelling are investigated using satellite, in-situ observations, and a numerical model. Results reveal the presence of two well-defined upwelling cells. The first cell (Core 1) is located in the southeastern corner of Madagascar, and the second cell (Core 2) is west of the southern tip of Madagascar. These two cores are characterized by different seasonal variability, different intensities, different upwelled water mass origins, and distinct forcing mechanisms. Core 1 is associated with a dynamical upwelling forced by the detachment of the East Madagascar Current (EMC), which is reinforced by upwelling favourable winds. Core 2 which appears to be primarily forced by upwelling favourable winds, is also influenced by a poleward eastern boundary flow coming from the Mozambique Channel. This intrusion of Mozambique Channel warm waters could result in an asynchronicity in seasonality between upwelling surface signature and upwelling favourables winds. The second part of the thesis focuses on the interaction between the intrusion of warm water from Mozambique channel and the upwelling cell in Core 2. Cruise datasets, satellite remote sensing observations and model data analyses are combined to highlight the existence of a coastal surface poleward flow in the south-west of Madagascar: the South-west MAdagascar iv Coastal Current (SMACC). The SMACC is a relatively shallow (Coastal Current (SMACC). The SMACC is a relatively shallow (<300 m) and narrow (<100km wide) warm and salty coastal surface current, which flows along the south western coast of Madagascar toward the south, opposite to the dominant winds. The warm water surface signature of the SMACC extends from 22◦S (upstream) to 26.4◦S (downstream). The SMACC exhibits a seasonal variability: more intense in summer and reduced in winter. The average volume transport of its core is about 1.3 Sv with a mean summer maximum of 2.1 Sv. It is forced by a strong cyclonic wind stress curl associated with the bending of the trade winds along the southern tip of Madagascar. The SMACC directly influences the coastal upwelling regions south of Madagascar. Its existence is likely to influence local fisheries and larval transportpatterns, as well as the connectivity with the Agulhas Current, affecting… Advisors/Committee Members: Rouault, Mathieu (advisor), Penven, Pierrick (advisor), Gula, Jonathan (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ramanantsoa, H. J. D. (2018). Variability of coastal upwelling south of Madagascar. (Doctoral Dissertation). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29859

Chicago Manual of Style (16^th Edition):

Ramanantsoa, Heriniaina Juliano Dani. “Variability of coastal upwelling south of Madagascar.” 2018. Doctoral Dissertation, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29859.

MLA Handbook (7^th Edition):

Ramanantsoa, Heriniaina Juliano Dani. “Variability of coastal upwelling south of Madagascar.” 2018. Web. 22 Sep 2019.

Vancouver:

Ramanantsoa HJD. Variability of coastal upwelling south of Madagascar. [Internet] [Doctoral dissertation]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29859.

Council of Science Editors:

Ramanantsoa HJD. Variability of coastal upwelling south of Madagascar. [Doctoral Dissertation]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29859

University of Cape Town

3. du Plessis, Marcel David. The impact of submesoscales on the stratification dynamics in the Southern Ocean.

Degree: PhD, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29624

► Submesoscale dynamics O(1-10 km, hours to days) are considered to strongly affect the stratification of the upper ocean. In the Southern Ocean, studies of submesoscale… (more)

▼ Submesoscale dynamics O(1-10 km, hours to days) are considered to strongly affect the stratification of the upper ocean. In the Southern Ocean, studies of submesoscale dynamics are biased to regions preconditioned for strong frontal activity and topographical influence. This dissertation considers the role of submesoscales on the evolution of mixed layer depth and upper ocean stratification in the open-ocean Subantarctic Ocean. First, we present autonomous ocean glider measurements from spring to late-summer to show that transient increases in stratification within the mixed layer during spring result in rapid mixed layer shoaling events. A realistically-forced simulation using a one-dimensional mixed layer model fails to explain these observed stratification events. We show that during this time, baroclinic mixed layer instabilities periodically induce a restratification flux of over 1000 W. m2, suggesting that the unexplained restratification is likely a result of submesoscale flows. Second, we study four separate years of seasonal-length (mid-winter to latesummer) glider experiments to define how submesoscale flows may induce interannual variations in the onset of spring/summer mixed layer restratification. Sustained temporal increases of stratification above the winter mixed layer, which defines the onset of seasonal restratification, can differ by up to 28 days between the four years studied. To explain this discrepancy, equivalent heat fluxes of baroclinic mixed layer instabilities (restratification) and Ekman buoyancy flux (restratification or mixing) are parameterized into a one-dimensional mixed layer model. Simulations including the parameterizations reveal a seasonal evolution of mixed layer stratification which is significantly more comparable to the glider observations than model simulations using heat and freshwater fluxes alone. Furthermore, the parameterization dramatically improves the sub-seasonal variability of mixed layer stratification, particularly during the onset of seasonal restratification when the mixed layer remains deep despite a positive surface heat flux. Following this, we characterize the full seasonal cycle of submesoscale flows using a realistically-forced 1/36 NEMO simulation of the Atlantic Southern Ocean. We show that deep winter mixed layers enhance the upper ocean available potential energy, which through the release of baroclinic mixed layer instabilities drive increased vertical buoyancy flux and potential to kinetic energy. These processes are associated with strong vertical velocities within the mixed layer characterized by large instantaneous upwelling and downwelling fluxes at the location of fronts. The insights from the glider observations propose that baroclinic mixed layer instabilities lead to increased near surface restratification in winter to spring, but are regulated by the synoptic-scale increases in Ekman buoyancy flux, which can keep the mixed layer deep for up to a month after surface warming. We propose the balance between restratification by baroclinic… Advisors/Committee Members: Swart, Sebastiaan (advisor), Ansorge, Isabel (advisor), Mahadevan, Amala (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

du Plessis, M. D. (2018). The impact of submesoscales on the stratification dynamics in the Southern Ocean. (Doctoral Dissertation). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29624

Chicago Manual of Style (16^th Edition):

du Plessis, Marcel David. “The impact of submesoscales on the stratification dynamics in the Southern Ocean.” 2018. Doctoral Dissertation, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29624.

MLA Handbook (7^th Edition):

du Plessis, Marcel David. “The impact of submesoscales on the stratification dynamics in the Southern Ocean.” 2018. Web. 22 Sep 2019.

Vancouver:

du Plessis MD. The impact of submesoscales on the stratification dynamics in the Southern Ocean. [Internet] [Doctoral dissertation]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29624.

Council of Science Editors:

du Plessis MD. The impact of submesoscales on the stratification dynamics in the Southern Ocean. [Doctoral Dissertation]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29624

University of Cape Town

4. Gamoyo, Majambo J. Modelling dispersal and connectivity of broadcast spawning corals in the Western Indian Ocean.

Degree: PhD, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29633

► Coral reef degradation is happening at an alarming rate all over the world due to multiple stressors with elevated sea surface temperature being the root… (more)

▼ Coral reef degradation is happening at an alarming rate all over the world due to multiple stressors with elevated sea surface temperature being the root cause. Using the Regional Ocean Modelling System and an individual-based model for the western Indian Ocean, this thesis explored the general circulation patterns (both large and mesoscale) important to dispersal and connectivity of broadcast corals while identifying regions that act as a source of larvae and those that receive larvae. Because habitat destruction and fragmentation through severe bleaching and mortality threaten coral reef health, projected thermal stress from Global Climate Models was explored to quantify future bleaching scenarios that might impact the reproductive timing and larval dispersal. Evaluation of the ROMS configuration for the western Indian Ocean shows that the basin-scale circulation patterns of the region are appropriately captured with the mean volume transports consistent with those derived from observation. Using the eddy detection algorithm, a description of the Southern Gyre as a key aspect of the Somali Current system was identified. The Southern Gyre is associated with barotropic instabilities associated with the northward flowing Somali Current. Rossby waves arriving at the East African coast and the strength of the monsoon winds are also responsible for the evolution and intensification of the gyre. The aggregated trajectories from the Lagrangian model highlight the dominant dispersal pathways and barriers to dispersal following release. The general circulation plays an important role in the dispersal of reef larvae over the study region. At a short pelagic larval duration, most of the released larvae settle back to or near natal reefs, but as the pelagic duration increases, the number of isolated reefs and islands decreases. Even with increased pelagic duration, some reefs (e.g., Agalega and Tromelin) are completely isolated. The mean dispersal distance from release to settlement varied across the region with larvae released along the East African coast dispersed an average of 405 km before settling while those in the Seychelles archipelago dispersed about 101 km. Different blocks of clusters were observed with 16 clusters observed when the pelagic duration is shorter (5 days), compared to seven clusters when the pelagic duration is longer (60 days). The warming trends and bleaching thermal stress shows that among the 636 reef pixels in the study region, about 56% showed positive sea surface temperature trends during the study period (1985- 2016). The frequency of bleaching level thermal stress has also increased over the same period, a tendency that climate models project to continue. Even under optimistic scenarios (such as the Representative Concentration Pathway RCP 4.5), most coral reefs are projected to experience severe bleaching and possible mortality by the 2050s. Low to moderate thermal stress are projected over reefs along the East African coast and near the northwest tip of Madagascar and thus these regions may… Advisors/Committee Members: Reason, Christopher (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Gamoyo, M. J. (2018). Modelling dispersal and connectivity of broadcast spawning corals in the Western Indian Ocean. (Doctoral Dissertation). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29633

Chicago Manual of Style (16^th Edition):

Gamoyo, Majambo J. “Modelling dispersal and connectivity of broadcast spawning corals in the Western Indian Ocean.” 2018. Doctoral Dissertation, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29633.

MLA Handbook (7^th Edition):

Gamoyo, Majambo J. “Modelling dispersal and connectivity of broadcast spawning corals in the Western Indian Ocean.” 2018. Web. 22 Sep 2019.

Vancouver:

Gamoyo MJ. Modelling dispersal and connectivity of broadcast spawning corals in the Western Indian Ocean. [Internet] [Doctoral dissertation]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29633.

Council of Science Editors:

Gamoyo MJ. Modelling dispersal and connectivity of broadcast spawning corals in the Western Indian Ocean. [Doctoral Dissertation]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29633

University of Cape Town

5. Luyt, Hermann. Quantifying the SST biases in data assimilative ocean simulations of the Benguela Upwelling System.

Degree: MSc, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29734

► The Benguela Upwelling System (BUS) on the west coast of southern Africa is one of the global ocean’s most productive upwelling systems supporting a large… (more)

▼ The Benguela Upwelling System (BUS) on the west coast of southern Africa is one of the global ocean’s most productive upwelling systems supporting a large fishing industry, a fledgling aquaculture sector and offshore mining interests. Despite intensive monitoring and modelling studies, there is no regionally tailored ocean forecasting system that is explicitly developed to deal with the unique ocean dynamics of the Benguela. In this study, the Hybrid Coordinate Ocean Model (HYCOM) is used in conjunction with the Ensemble Optimal Interpolation (EnOI) assimilation scheme to study the impact of assimilating sea surface temperature (SST) and along-track sea level anomalies (SLA) observations on predicted upwelling dynamics in the Benguela. In order to evaluate the predictive skill and impact of data assimilation, three experiments with HYCOMEnOI are evaluated: (1) with no assimilation (HYCOMFREE), (2) only assimilating along-track SLA (HYCOMSLA) and (3) assimilating both SLA and SST (HYCOMSLA+SST). Using MODIS Terra SST as reference, the model SST outputs are evaluated. HYCOMFREE is found to exhibit a warm bias along the coast, HYCOMSLA shows an even greater warm bias while HYCOMSLA+SST conversely shows a much improved SST forecast skill. It is hypothesised that the warm biases could be due to errors in boundary conditions and/or the ERA-interim wind product used to force the model. Furthermore, a comparison of the assimilated SST product (the Operational Sea Surface Temperature and Sea Ice Analysis; OSTIA) with MODIS SST reveals biases in OSTIA up to ±1 ◦C, raising questions over its suitability for assimilation in upwelling regions. Studying the effect of assimilation on SSH, SST and surface currents before and after the assimilation suggests that an increase in SSH from assimilated SLA leads to increased warm SST biases in HYCOMSLA. This is due to an incorrect relationship between SSH and SST in the free-running HYCOM, from which the static ensemble is derived for the EnOI. HYCOMSLA+SST exhibits slightly enhanced SSH increments but the associated increase in SST is significantly reduced by the assimilated SST, resulting in a reduction of the bias with very little impact on the current dynamics. This is reflected in the surface velocitiy increments, which are similar to or worse than that of HYCOMSLA. Investigating the potential of HYCOM-EnOI as an operational forecasting system has revealed that the assimilation of SST and along-track SLA vastly improves modelled SST for the BUS upwelling. Errors in the free-running model, which constitutes the static ensemble, need addressing and comparisons between MODIS and OSTIA SSTs suggests that OSTIA may not be ideally suited for assimilation in the case of coastal upwelling, due to limitations in capturing the dynamics correctly. Advisors/Committee Members: Backeberg, B C (advisor), Veitch, J (advisor), Vichi, M (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Luyt, H. (2018). Quantifying the SST biases in data assimilative ocean simulations of the Benguela Upwelling System. (Masters Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29734

Chicago Manual of Style (16^th Edition):

Luyt, Hermann. “Quantifying the SST biases in data assimilative ocean simulations of the Benguela Upwelling System.” 2018. Masters Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29734.

MLA Handbook (7^th Edition):

Luyt, Hermann. “Quantifying the SST biases in data assimilative ocean simulations of the Benguela Upwelling System.” 2018. Web. 22 Sep 2019.

Vancouver:

Luyt H. Quantifying the SST biases in data assimilative ocean simulations of the Benguela Upwelling System. [Internet] [Masters thesis]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29734.

Council of Science Editors:

Luyt H. Quantifying the SST biases in data assimilative ocean simulations of the Benguela Upwelling System. [Masters Thesis]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29734

University of Cape Town

6. Taukoor, Sheveenah Sunnassee. Multiple scenario analyses forecasting the impacts of sea level rise in Cape Town, South Africa.

Degree: MSc, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29466

► Sea level rise is highly interdisciplinary and its study entails not only oceanography, but other fields such as geomatics, climatology and geology. In this study… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Taukoor, S. S. (2018). Multiple scenario analyses forecasting the impacts of sea level rise in Cape Town, South Africa. (Masters Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29466

Chicago Manual of Style (16^th Edition):

Taukoor, Sheveenah Sunnassee. “Multiple scenario analyses forecasting the impacts of sea level rise in Cape Town, South Africa.” 2018. Masters Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29466.

MLA Handbook (7^th Edition):

Taukoor, Sheveenah Sunnassee. “Multiple scenario analyses forecasting the impacts of sea level rise in Cape Town, South Africa.” 2018. Web. 22 Sep 2019.

Vancouver:

Taukoor SS. Multiple scenario analyses forecasting the impacts of sea level rise in Cape Town, South Africa. [Internet] [Masters thesis]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29466.

Council of Science Editors:

Taukoor SS. Multiple scenario analyses forecasting the impacts of sea level rise in Cape Town, South Africa. [Masters Thesis]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29466

University of Cape Town

7. De Kock, Wade. The Marginal Ice Zone (MIZ) seawater property dynamics of the Southern Ocean below Southern Africa using animal-borne observations.

Degree: MSc, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29614

► The Marginal Ice Zone (MIZ) in the Southern Ocean is a dynamic area shown to vary seasonally in width and extent northward. Remote sensing is… (more)

▼ The Marginal Ice Zone (MIZ) in the Southern Ocean is a dynamic area shown to vary seasonally in width and extent northward. Remote sensing is the only tool available to give a large-scale picture of sea-ice conditions but it is important to note that only surface properties are visible in remote sensing products. Little is known about the hydrographical properties of the Atlantic Sector of the Southern Ocean in the austral winter as it is difficult to obtain shipboard observations. Using observations from southern elephant seals, it is possible to analyse properties such as salinity and temperature within the MIZ. These properties may then be related to observations of sea ice concentration obtained by remote sensing to qualitatively describe their relationships. This work provides an example of how data from selected seal observations and satellite data can be used operationally to define the hydrography of the MIZ, focusing on the years 2005 to 2009. Results show that the properties of the underlying water in the MIZ appear to be fairly constant in the region of 15°W to 45°E for the months of July and August. A warmer pool of water is evident in the east of this region. Based on what is known about the physics of the region and what is seen spatially regarding changes in temperature and salinity, the warm pool may be brought about by eddies along the South West Indian Ridge. Results also show that surface concentrations of sea ice may have an effect on the underlying properties of the water. A more detailed description of the characteristics and features in the MIZ may further help to understand key processes in the region. Changes in subsurface temperature and salinity may influence the formation of ice. This may in turn influence large to mesoscale processes in both the ocean and atmosphere. Understanding how these physical properties change and what may cause them to change can help further understanding of larger scale processes. Advisors/Committee Members: Vichi, Marcello (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

De Kock, W. (2018). The Marginal Ice Zone (MIZ) seawater property dynamics of the Southern Ocean below Southern Africa using animal-borne observations. (Masters Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29614

Chicago Manual of Style (16^th Edition):

De Kock, Wade. “The Marginal Ice Zone (MIZ) seawater property dynamics of the Southern Ocean below Southern Africa using animal-borne observations.” 2018. Masters Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29614.

MLA Handbook (7^th Edition):

De Kock, Wade. “The Marginal Ice Zone (MIZ) seawater property dynamics of the Southern Ocean below Southern Africa using animal-borne observations.” 2018. Web. 22 Sep 2019.

Vancouver:

De Kock W. The Marginal Ice Zone (MIZ) seawater property dynamics of the Southern Ocean below Southern Africa using animal-borne observations. [Internet] [Masters thesis]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29614.

Council of Science Editors:

De Kock W. The Marginal Ice Zone (MIZ) seawater property dynamics of the Southern Ocean below Southern Africa using animal-borne observations. [Masters Thesis]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29614

University of Cape Town

8. Vianello, Patrick Angus. A qualitative and physical analysis of processes around the Mascarene plateau.

Degree: Image, Oceanography, 2015, University of Cape Town

URL: http://hdl.handle.net/11427/16940

► The Mascarene Plateau is a submerged volcanic plateau to the east of Madagascar which extends over 2200 km between the Seychelles and Mauritius. It is… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Vianello, P. A. (2015). A qualitative and physical analysis of processes around the Mascarene plateau. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/16940

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):

Vianello, Patrick Angus. “A qualitative and physical analysis of processes around the Mascarene plateau.” 2015. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/16940.

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

MLA Handbook (7^th Edition):

Vianello, Patrick Angus. “A qualitative and physical analysis of processes around the Mascarene plateau.” 2015. Web. 22 Sep 2019.

Vancouver:

Vianello PA. A qualitative and physical analysis of processes around the Mascarene plateau. [Internet] [Thesis]. University of Cape Town; 2015. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/16940.

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

Council of Science Editors:

Vianello PA. A qualitative and physical analysis of processes around the Mascarene plateau. [Thesis]. University of Cape Town; 2015. Available from: http://hdl.handle.net/11427/16940

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

University of Cape Town

9. Smith, Marié. The use of reflectance classification for chlorophyll algorithm application across multiple optical water types in South African coastal waters.

Degree: Image, Oceanography, 2016, University of Cape Town

URL: http://hdl.handle.net/11427/22836

► Ocean colour remote sensing is a valuable tool for deriving information about key biogeochemical variables over inland, coastal and ocean waters at scales unachievable via… (more)

▼ Ocean colour remote sensing is a valuable tool for deriving information about key biogeochemical variables over inland, coastal and ocean waters at scales unachievable via in situ techniques. However, broader use of ocean colour data is still limited by the need for users to choose among a seemingly complicated range of available satellite products and to understand the limitations and constraints of these products across a wide range of water types. This issue could benefit from the capability to seamlessly apply and blend watertype appropriate algorithms into a single output product that provides optimal retrievals over a wide range of water types. The assessment of the fuzzy membership of satellite remote sensing reflectance (Rᵣₛ) to pre-defined regional optical water types (OWTs) provides a framework for application and blending of OWT-appropriate algorithms on a per-pixel basis. This study presents the first characterization of the OWTs in the coastal waters of South Africa. The OWTs are determined through stepwise fuzzy c-means clustering of a systematically expanding and modified database constructed from in situ, synthetic and regionally extracted Medium Resolution Imaging Spectrometer (MERIS) Rᵣₛ. A database division allows separate and more detailed clustering of phytoplankton-dominated Rᵣₛ and backscattering-dominated Rᵣₛ into six and five classes respectively. Chlorophyll α (Chl α) algorithms are assigned per OWT based on lowest error and uncertainty. The blended Chl α product consists of weighted retrievals from five different algorithms, including two 4th order polynomial exponential algorithms utilizing the blue-green spectral region, two red-NIR band ratio algorithms, and a neural network. The algorithm blending procedure retrieves satellite-derived Chl α concentration ([Chl α]) with lower RMS error and uncertainty compared to individual algorithms and provides improved capability to retrieve [Chl α] for different South African water types with a single product over a range spanning almost four orders of magnitude. The eleven OWTs are utilized in the classification and algorithm blending framework and applied to the full archive of MERIS Level 2 reflectance between the years 2002 and 2012 over South Africa's coastal waters. The persistence of the OWTs is presented and linked to the prominent environmental and physical drivers, whilst regions with low total class membership sums are discussed in terms of satellite data coverage and data quality. A time series of the blended [Chl α] product displays improved capability to capture the ranges of variability observed in the coastal, shelf and offshore environment compared to currently available regional and standard MERIS Level 2 products. Advisors/Committee Members: Vichi, Marcello (advisor), Bernard, Stewart (advisor), Matthews, Mark (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Smith, M. (2016). The use of reflectance classification for chlorophyll algorithm application across multiple optical water types in South African coastal waters. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/22836

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):

Smith, Marié. “The use of reflectance classification for chlorophyll algorithm application across multiple optical water types in South African coastal waters.” 2016. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/22836.

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

MLA Handbook (7^th Edition):

Smith, Marié. “The use of reflectance classification for chlorophyll algorithm application across multiple optical water types in South African coastal waters.” 2016. Web. 22 Sep 2019.

Vancouver:

Smith M. The use of reflectance classification for chlorophyll algorithm application across multiple optical water types in South African coastal waters. [Internet] [Thesis]. University of Cape Town; 2016. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/22836.

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

Council of Science Editors:

Smith M. The use of reflectance classification for chlorophyll algorithm application across multiple optical water types in South African coastal waters. [Thesis]. University of Cape Town; 2016. Available from: http://hdl.handle.net/11427/22836

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

University of Cape Town

10. Philibert, Marie Catherine Raïssa. A comparative study of nitrogen uptake and nitrification rates in sub-tropical, polar and upwelling waters.

Degree: Image, Oceanography, 2015, University of Cape Town

URL: http://hdl.handle.net/11427/16794

► Nitrification is the oxidation of ammonium to nitrate through a two step biological process. Nitrification in the euphotic zone has, in the past, been considered… (more)

▼ Nitrification is the oxidation of ammonium to nitrate through a two step biological process. Nitrification in the euphotic zone has, in the past, been considered negligible even though quantifying this process correctly is important when linking carbon export to nitrate uptake by phytoplankton. However, studies of both nitrogen uptake and nitrification rates in surface waters are rare. This thesis presents such data for the Southern Ocean and St-Helena Bay, located in the Southern Benguela upwelling system. Using 15N tracers, Nitrogen uptake and regeneration rates were measured in the Southern Ocean (during a winter cruise in July 2012 and a summer cruise in February-March 2013) and St-Helena Bay (during three studies in November 2011, March 2012 and March 2013). In St-Helena Bay, the upwelling (bloom) cycle was one of the main drivers of the nitrogen cycle. As the bloom cycle started, nitrate uptake rates (5:47 ± 670:48nmol∙L⁻¹∙h⁻¹) and nitrite regeneration (4:36 - 1:28 ± 22:83 - 1:63nmol∙L⁻¹∙h⁻¹) were high but the contribution of nitrification to the nitrate demand was low. Nitrite regeneration at this time could have been driven by phytoplankton excretion. In contrast, at the end of the bloom cycle, nitrate uptake rates were low and was exceeded by nitrate regeneration rates (25:34 - 6:16 ± 82:74 - 34:41nmol∙L⁻¹∙h⁻¹). Nitrite regeneration decreased and was most likely due to ammonium oxidation at this stage of the upwelling cycle. Nitrification in the Southern Ocean was more variable than in St-Helena Bay. It was only detected at five stations out of fifteen and the accuracy of the high nitrite oxidation rates (37:21 - 9:13 ± 217 - 88nmol∙L⁻¹∙h⁻¹) observed can only be assessed with repeat measurements. Nitrate uptake rates ranged from 0.07 to 57:00nmol∙L⁻¹∙h⁻¹ while ammonium uptake rates ranged from 0.81 - 160:94nmol∙L⁻¹∙h⁻¹. The nitrogen uptake rates were similar for both seasons. Using multivariate statistical approach, it was found that during winter, in the Southern Ocean, light and ammonium availability were the most important factors regulating nitrogen uptake while in the late summer, changes in the mixed layer depth had a larger effect. This study provides new observational data for two undersampled regions and contributes to further the mechanistic understanding of the factors regulating nitrogen uptake and nitrification in the Southern Ocean and St-Helena Bay. Advisors/Committee Members: Waldron, Howard (advisor), Clark, Darren (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Philibert, M. C. R. (2015). A comparative study of nitrogen uptake and nitrification rates in sub-tropical, polar and upwelling waters. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/16794

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):

Philibert, Marie Catherine Raïssa. “A comparative study of nitrogen uptake and nitrification rates in sub-tropical, polar and upwelling waters.” 2015. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/16794.

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

MLA Handbook (7^th Edition):

Philibert, Marie Catherine Raïssa. “A comparative study of nitrogen uptake and nitrification rates in sub-tropical, polar and upwelling waters.” 2015. Web. 22 Sep 2019.

Vancouver:

Philibert MCR. A comparative study of nitrogen uptake and nitrification rates in sub-tropical, polar and upwelling waters. [Internet] [Thesis]. University of Cape Town; 2015. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/16794.

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

Council of Science Editors:

Philibert MCR. A comparative study of nitrogen uptake and nitrification rates in sub-tropical, polar and upwelling waters. [Thesis]. University of Cape Town; 2015. Available from: http://hdl.handle.net/11427/16794

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

University of Cape Town

11. Mashifane, Thulwaneng. Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system.

Degree: Image, Oceanography, 2017, University of Cape Town

URL: http://hdl.handle.net/11427/27309

► Two coupled physical-biogeochemical models namely, (Regional Ocean Modelling System and Biogeochemical of Eastern Boundary Upwelling Systems) ROMS-BioEBUS (3D) and (Nucleus for European Modelling of the… (more)

▼ Two coupled physical-biogeochemical models namely, (Regional Ocean Modelling System and Biogeochemical of Eastern Boundary Upwelling Systems) ROMS-BioEBUS (3D) and (Nucleus for European Modelling of the Ocean and Biogeochemical Flux Model) NEMO-BFM (1D) are applied in the Benguela upwelling system to understand biogeochemical interactions and their related feedback processes. The models are formulated differently but achieve similar objectives with respect to the physics and biogeochemistry. The BioEBUS model is used to simulate nitrogen processes under oxic and suboxic conditions in upwelling systems with no option for other cycles. Intermediary nitrogen processes, nitrous oxide production and nitrogen loss mechanisms are studied using this model. Physical and advection processes that drive the oceanic nitrogen cycle in the region are also studied with BioEBUS. The BFM is used to understand the implications of the nitrogen loss and suboxic-anoxic conditions on related biogeochemical cycles. The 1D model was selected for its low computational costs and flexibility for addition of new code. BFM includes the carbon, nitrogen, phosphorus, silicate, iron cycles and hydrogen sulphide production, which is a known occurrence in the Namibian shelf waters. New variables, nitrite and nitrous oxide production, are added in BFM to complete the nitrogen cycle. The nitrification process in BFM is also formulated in two stages as in BioEBUS to obtain comparative results in both models. Both models are compared and validated with data from the Maria S. Merian (MSM) 19/1b cruise and available products respectively. Simulated results from BioEBUS show primary and secondary nitrite maxima in the Benguela shelf waters. The primary nitrite maxima are attributed to nitrification and nitrate assimilation. Secondary nitrite maxima accumulate in the Angola-Benguela Front (ABF) oxygen minimum zone (OMZ) and are attributed to denitrification. Off Walvis Bay, these secondary nitrite maxima and ammonium are thought to be consumed by high rates of anaerobic ammonium oxidation (anammox). The nitrite maxima are restricted to the shelf off Walvis Bay and advected offshore in the ABF region. Interchanges between the poleward South Atlantic Central Water (SACW) and the equatorward, well-oxygenated Eastern South Atlantic Central Water (ESACW) drive the seasonality of nitrogen processes in the Benguela. Nitrous oxide concentrations are high in the ABF as a result of nitrification and accelerated production under suboxic conditions. Off Walvis Bay, nitrous oxide production is low when compared to the ABF. Nitrous oxide production in the ABF occurs in thermocline, intermediate and deeper water masses. Off Walvis Bay, nitrous oxide production in deeper water masses is missing because of the shallow coast. High fixed nitrogen fluxes in the Benguela are attributed to nitrification rather than anammox and denitrification. Simulated results show denitrification to be the dominant nitrogen loss mechanism in the Benguela shelf waters. Simulated results from BFM… Advisors/Committee Members: Vichi, Marcello (advisor), Waldron, Howard (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Mashifane, T. (2017). Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/27309

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):

Mashifane, Thulwaneng. “Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system.” 2017. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/27309.

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

MLA Handbook (7^th Edition):

Mashifane, Thulwaneng. “Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system.” 2017. Web. 22 Sep 2019.

Vancouver:

Mashifane T. Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system. [Internet] [Thesis]. University of Cape Town; 2017. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/27309.

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

Council of Science Editors:

Mashifane T. Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system. [Thesis]. University of Cape Town; 2017. Available from: http://hdl.handle.net/11427/27309

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

University of Cape Town

12. Williams, Tania Carol. The impact of increased grid resolution on the mixed layer depth variability in the South Atlantic Ocean and Southern Ocean.

Degree: Image, Oceanography, 2016, University of Cape Town

URL: http://hdl.handle.net/11427/20814

► The Southern Ocean plays a major role in global climate system. An understanding of Southern Ocean dynamics allows for a better understanding of the carbon… (more)

▼ The Southern Ocean plays a major role in global climate system. An understanding of Southern Ocean dynamics allows for a better understanding of the carbon cycle and possible future climate conditions. Earth System Models are used to study Southern Ocean dynamics and are currently producing reliable global annual carbon uptake but have limiting seasonal abilities. These models produce dependable results on a global scale, with more conflicting results on a basin scale. Here we study the impact of mesoscale variability on the Mixed Layer Depth in the Sub-Tropical and Sub-Antarctic Zone of the South Atlantic. The region is hugely impacted by the mesoscale variability as a result of the South African boundary currents. We use two regional simulations both at 1/4o resolution, with one model containing online nested child domain over the South African boundary currents (1/12o resolution). The inter-annual simulations both use the same forcing which allow for a comparison study between the two models. Both the nested and standalone model are able to capture the large scale oceanographic features in the domain. The biggest difference is seen in the Agulhas Current region, where the nested model simulates better mesoscale features, resulting in a fairly accurate position of the Agulhas retroflection and return current. The standalone model contains a high temperature and salinity bias which influences the vertical structure of the water column. Both models are able to simulate the seasonality of the MLD in the Sub-Tropical and Sub-Antarctic Zone in the Atlantic sector. The models overestimate MLD in regions closer to the boundary currents. In the nested model the presence of increased mesoscale features promotes stratification of the water column. The differences seen in the MLD of the two models are linked to the temperature and salinity bias in the standalone model as well as the increased mesoscale variability in the nested model. Advisors/Committee Members: Ansorge, Isabelle Jane (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Williams, T. C. (2016). The impact of increased grid resolution on the mixed layer depth variability in the South Atlantic Ocean and Southern Ocean. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/20814

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):

Williams, Tania Carol. “The impact of increased grid resolution on the mixed layer depth variability in the South Atlantic Ocean and Southern Ocean.” 2016. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/20814.

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

MLA Handbook (7^th Edition):

Williams, Tania Carol. “The impact of increased grid resolution on the mixed layer depth variability in the South Atlantic Ocean and Southern Ocean.” 2016. Web. 22 Sep 2019.

Vancouver:

Williams TC. The impact of increased grid resolution on the mixed layer depth variability in the South Atlantic Ocean and Southern Ocean. [Internet] [Thesis]. University of Cape Town; 2016. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/20814.

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

Council of Science Editors:

Williams TC. The impact of increased grid resolution on the mixed layer depth variability in the South Atlantic Ocean and Southern Ocean. [Thesis]. University of Cape Town; 2016. Available from: http://hdl.handle.net/11427/20814

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

University of Cape Town

13. Holton, Lisa E. Spatio-temporal characteristics of the Agulhas leakage: a model inter-comparison study.

Degree: Image, Oceanography, 2015, University of Cape Town

URL: http://hdl.handle.net/11427/15563

► Investigating the variability of the Agulhas leakage, the volume transport of water from the Indian Ocean to the South Atlantic Ocean, is highly relevant due… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Holton, L. E. (2015). Spatio-temporal characteristics of the Agulhas leakage: a model inter-comparison study. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/15563

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):

Holton, Lisa E. “Spatio-temporal characteristics of the Agulhas leakage: a model inter-comparison study.” 2015. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/15563.

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

MLA Handbook (7^th Edition):

Holton, Lisa E. “Spatio-temporal characteristics of the Agulhas leakage: a model inter-comparison study.” 2015. Web. 22 Sep 2019.

Vancouver:

Holton LE. Spatio-temporal characteristics of the Agulhas leakage: a model inter-comparison study. [Internet] [Thesis]. University of Cape Town; 2015. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/15563.

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

Council of Science Editors:

Holton LE. Spatio-temporal characteristics of the Agulhas leakage: a model inter-comparison study. [Thesis]. University of Cape Town; 2015. Available from: http://hdl.handle.net/11427/15563

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

University of Cape Town

14. Pringle, Nicholas. Exploring optimising strategies for sampling air-sea carbon dioxide flux in the southern ocean.

Degree: Image, Oceanography, 2014, University of Cape Town

URL: http://hdl.handle.net/11427/13383

► A model study was undertaken to investigate the optimization of sampling strategies for returning low-uncertainty sea-air CO₂ flux measurements in the Southern Ocean. Replicating Lenton… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Pringle, N. (2014). Exploring optimising strategies for sampling air-sea carbon dioxide flux in the southern ocean. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/13383

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):

Pringle, Nicholas. “Exploring optimising strategies for sampling air-sea carbon dioxide flux in the southern ocean.” 2014. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/13383.

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

MLA Handbook (7^th Edition):

Pringle, Nicholas. “Exploring optimising strategies for sampling air-sea carbon dioxide flux in the southern ocean.” 2014. Web. 22 Sep 2019.

Vancouver:

Pringle N. Exploring optimising strategies for sampling air-sea carbon dioxide flux in the southern ocean. [Internet] [Thesis]. University of Cape Town; 2014. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/13383.

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

Council of Science Editors:

Pringle N. Exploring optimising strategies for sampling air-sea carbon dioxide flux in the southern ocean. [Thesis]. University of Cape Town; 2014. Available from: http://hdl.handle.net/11427/13383

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

University of Cape Town

15. Jacobs, Christopher Richard. A description of the hydrography between Cape Town and Antarctica along the GoodHope Transect between 2004-2012.

Degree: Image, Oceanography, 2015, University of Cape Town

URL: http://hdl.handle.net/11427/15495

► The Antarctic Circumpolar Current (ACC) within the Southern Ocean (SO) is the primary driver for global interoceanic exchanges. These exchanges form the foundation for the… (more)

▼ The Antarctic Circumpolar Current (ACC) within the Southern Ocean (SO) is the primary driver for global interoceanic exchanges. These exchanges form the foundation for the Meridional Overturning Circulation (MOC), a deep density driven circulation, which extends throughout the global oceans. The fronts of the ACC, consisting of several branches, separate zones of distinct water masses, thus identifying the location of the fronts and understanding their dynamics is of global importance. The GoodHope programme, is a repeat annual transect between South Africa and Antarctica, monitoring the exchanges within the Southeast Atlantic sector of the Southern Ocean. This is achieved through high resolution Expendable Bathythermograph (XBT) sampling. In this study XBT data over an eight year period (2004 â€“ 2012) were investigated and analysed. One aim is to illustrate the variability of the fronts associated with the ACC using in-situ data from 21 transects during this eight year period. The Sub-tropical Front (STF) and Northern branch of the Sub-Antarctic Front (SAF-N) are seen to be the most variable with frontal latitudinal shifts ranging from 2-4Â° and 1-2Â° respectively. One cause of this high variability is the interaction of mesoscale features, particularly in the form of eddies and Agulhas rings. The southernmost fronts of the ACC, namely the Southern Antarctic Circumpolar front(sACCf), consisting of a Northern and Southern branch of the sACCf (sACCf-N and sACCf-S) and Southern Boundary (SBdy), also display high variability due to seasonality brought on by ice melt. The central fronts of the ACC, the Middle and Southern branches of the SAF (M-SAF and S-SAF)and Northern, Middle and Southern branches of the Polar Front (PF-N, PF-M and PF-S) remain throughout the eight year observations fairly constant, with shifts observed to be less than 1Â° of latitude. Grouping the Good Hope transects into austral summer periods, illustrates the di-pentadal nature of the STF, whereby the shifts are in response to mesoscale interactions. Comparing the mean position of the fronts and their position observed during a single winter cruise in July 2012, an overall Northward shift was observed with most of the fronts with significant shifts occurring in the SAF-N and PF-N. This is due to the outcrop of different water masses occurring further South ward and Northward respectively. Advisors/Committee Members: Ansorge, Isabelle Jane (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Jacobs, C. R. (2015). A description of the hydrography between Cape Town and Antarctica along the GoodHope Transect between 2004-2012. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/15495

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):

Jacobs, Christopher Richard. “A description of the hydrography between Cape Town and Antarctica along the GoodHope Transect between 2004-2012.” 2015. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/15495.

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

MLA Handbook (7^th Edition):

Jacobs, Christopher Richard. “A description of the hydrography between Cape Town and Antarctica along the GoodHope Transect between 2004-2012.” 2015. Web. 22 Sep 2019.

Vancouver:

Jacobs CR. A description of the hydrography between Cape Town and Antarctica along the GoodHope Transect between 2004-2012. [Internet] [Thesis]. University of Cape Town; 2015. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/15495.

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

Council of Science Editors:

Jacobs CR. A description of the hydrography between Cape Town and Antarctica along the GoodHope Transect between 2004-2012. [Thesis]. University of Cape Town; 2015. Available from: http://hdl.handle.net/11427/15495

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

University of Cape Town

16. Halo, Issufo F M. The Mozambique Channel eddies : characteristics and mechanisms of formation.

Degree: Image, Oceanography, 2012, University of Cape Town

URL: http://hdl.handle.net/11427/6477

► The model outputs and the satellite data have shown a number of cyclonic and anticyclonic eddies being generated within the Mozambique Channel. The eddies were… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Halo, I. F. M. (2012). The Mozambique Channel eddies : characteristics and mechanisms of formation. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/6477

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):

Halo, Issufo F M. “The Mozambique Channel eddies : characteristics and mechanisms of formation.” 2012. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/6477.

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

MLA Handbook (7^th Edition):

Halo, Issufo F M. “The Mozambique Channel eddies : characteristics and mechanisms of formation.” 2012. Web. 22 Sep 2019.

Vancouver:

Halo IFM. The Mozambique Channel eddies : characteristics and mechanisms of formation. [Internet] [Thesis]. University of Cape Town; 2012. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/6477.

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

Council of Science Editors:

Halo IFM. The Mozambique Channel eddies : characteristics and mechanisms of formation. [Thesis]. University of Cape Town; 2012. Available from: http://hdl.handle.net/11427/6477

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

University of Cape Town

17. Rouault, Marjolaine. Agulhas current variability determined from space : a multi-sensor approach.

Degree: Image, Oceanography, 2011, University of Cape Town

URL: http://hdl.handle.net/11427/8500

► Satellite remote sensing datasets including more than 6 years of high frequency Sea Surface Temperature (SST) imagery as well as surface current observations derived from… (more)

▼ Satellite remote sensing datasets including more than 6 years of high frequency Sea Surface Temperature (SST) imagery as well as surface current observations derived from 18 years of merged-altimetry and over 2 years of Advanced Synthetic Aperture Radar (ASAR) observations are combined to study the variability of the Agulhas Current. The newly available rangedirected surface currents velocities from ASAR, which rely on the careful analysis of the measured Doppler shift, show strong promise for monitoring the meso to sub-mesoscale features of the surface circulation. While the accuracy of ASAR surface current velocities suffers from occasional bias due to our current inability to systematically account for the wind-induced contribution to the Doppler shift signal, the ASAR surface current velocities are able to consistently highlight regions of strong current and shear. The synaptic nature and relatively high resolution of ASAR acquisitions make the ASAR derived current velocities a good complement to altimetry for the study of sub-mesoscale processes and western boundary current dynamics. Time-averaged range-directed surface currents derived from ASAR provide an improved map of the mean Agulhas Current flow, clearly showing the location of the Agulhas Current core over the 1000 m isobath and identifying the region at the shelf edge of the north-eastern Agulhas Bank as one of the most variable within the Agulhas Current. To determine the variability of the Agulhas Current, an algorithm to track the position of the current is developed and applied to the longer merged-altimetry and SST records. Limitations associated with altimetry near the coast favour the use of the SST dataset to track the position of the Agulhas Current in its northern region. In the southern Agulhas, where the current lies further from the coast, altimetry is suited to monitoring the position of the Agulhas Current. The front detection analysis conducted on the SST dataset in the northern Agulhas reveals the complex nature of Natal Pulses. The downstream passage of the Natal Pulses is associated with the generation of secondary offshore meanders at the inshore edge of the current. Perturbations formed during the passage of Natal Pulses evolve rapidly to either dissipate, re-merge with the initial Natal Pulse or in some rare occasion, detach from the Agulhas Current. Advisors/Committee Members: Shillington, Frank (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Rouault, M. (2011). Agulhas current variability determined from space : a multi-sensor approach. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/8500

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):

Rouault, Marjolaine. “Agulhas current variability determined from space : a multi-sensor approach.” 2011. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/8500.

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

MLA Handbook (7^th Edition):

Rouault, Marjolaine. “Agulhas current variability determined from space : a multi-sensor approach.” 2011. Web. 22 Sep 2019.

Vancouver:

Rouault M. Agulhas current variability determined from space : a multi-sensor approach. [Internet] [Thesis]. University of Cape Town; 2011. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/8500.

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

Council of Science Editors:

Rouault M. Agulhas current variability determined from space : a multi-sensor approach. [Thesis]. University of Cape Town; 2011. Available from: http://hdl.handle.net/11427/8500

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

University of Cape Town

18. Wainman, Carl Kevin. Estimating the upper ocean vertical temperature structure from surface temperature as applied to the southern Benguela.

Degree: Image, Oceanography, 2012, University of Cape Town

URL: http://hdl.handle.net/11427/10915

► Underwater Sound Velocity Profiles (SVP) are used throughout the world by their respective navies for submarine and surface vessel strategic operations and exercises. Together with… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Wainman, C. K. (2012). Estimating the upper ocean vertical temperature structure from surface temperature as applied to the southern Benguela. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/10915

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):

Wainman, Carl Kevin. “Estimating the upper ocean vertical temperature structure from surface temperature as applied to the southern Benguela.” 2012. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/10915.

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

MLA Handbook (7^th Edition):

Wainman, Carl Kevin. “Estimating the upper ocean vertical temperature structure from surface temperature as applied to the southern Benguela.” 2012. Web. 22 Sep 2019.

Vancouver:

Wainman CK. Estimating the upper ocean vertical temperature structure from surface temperature as applied to the southern Benguela. [Internet] [Thesis]. University of Cape Town; 2012. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/10915.

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

Council of Science Editors:

Wainman CK. Estimating the upper ocean vertical temperature structure from surface temperature as applied to the southern Benguela. [Thesis]. University of Cape Town; 2012. Available from: http://hdl.handle.net/11427/10915

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

University of Cape Town

19. Blamey, Ross. Mesoscale convective complexes over southern Africa.

Degree: Image, Oceanography, 2012, University of Cape Town

URL: http://hdl.handle.net/11427/10167

A combination of numerous factors, including geographic position, regional orography and local sea surface temperatures, ensures that subtropical southern Africa experiences considerable spatial and temporal variability in rainfall and is prone to both frequent flooding and drought events. Advisors/Committee Members: Reason, Chris (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Blamey, R. (2012). Mesoscale convective complexes over southern Africa. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/10167

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):

Blamey, Ross. “Mesoscale convective complexes over southern Africa.” 2012. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/10167.

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

MLA Handbook (7^th Edition):

Blamey, Ross. “Mesoscale convective complexes over southern Africa.” 2012. Web. 22 Sep 2019.

Vancouver:

Blamey R. Mesoscale convective complexes over southern Africa. [Internet] [Thesis]. University of Cape Town; 2012. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/10167.

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

Council of Science Editors:

Blamey R. Mesoscale convective complexes over southern Africa. [Thesis]. University of Cape Town; 2012. Available from: http://hdl.handle.net/11427/10167

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

University of Cape Town

20. Sejeng, Manare C. Understanding variability across the Crossroad transect from 3 years (2013 to 2015) of hydrographic data.

Degree: MSc, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29425

► The southwest continental shelf of Africa is characterized by a strong western boundary current with three interdependent components, namely the Agulhas Current, Agulhas Retroflection and… (more)

▼ The southwest continental shelf of Africa is characterized by a strong western boundary current with three interdependent components, namely the Agulhas Current, Agulhas Retroflection and Agulhas Return Current. This system plays a key role in setting oceanic conditions south of Africa. The Crossroad transect intersects both the Agulhas Current and Agulhas Return Current; a monitoring line established in 2013 to sample both the currents and determine inter-ocean fluxes, as well as the influence of the Agulhas Current on the Agulhas Bank shelf. The objective of the study was to examine both mesoscale and submesoscale features that influence the dynamic and variant nature of the Agulhas system. In this study we make use of Ship board Acoustic Doppler Current Profiler (SADCP), Conductivity Temperature and Depth (CTD), Thermosalinograph (TSG) and satellite Sea Surface Height data as main observations for analysis. The study also examines both the spatial and temporal characteristics of water properties across the Crossroad transect. The fundamental findings of the study include the abundance of both the mesoscale and submesoscale features observed in the Agulhas system, which are often overlooked. In addition, a noticeable variability in current measurements was observed, where velocity ranging from 2 to 2.5 m/s represented the Agulhas Current and 1.4 to 1.7 m/s, Agulhas Return Current. The position of the Agulhas Current and Agulhas Return Current displayed variation from 2013 to 2015, with the Agulhas Return Current exhibiting a meandering pattern in 2014 along the transect. Furthermore, an intrusion of cool (8 to 13 °C), lower salinity (34.8 to 35 psu) South Indian Central Water masses were also observed along the Agulhas Bank. The ability to combine altimetry and in situ data also contributed to the analysis of the results. Therefore, given the inherent advantage of satellite and in situ measurements, an overview of the variability across the Crossroad transect was determined. Advisors/Committee Members: Ansorge, Isabel (advisor), Lamont, Tarron (advisor), Maes, Christophe (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Sejeng, M. C. (2018). Understanding variability across the Crossroad transect from 3 years (2013 to 2015) of hydrographic data. (Masters Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29425

Chicago Manual of Style (16^th Edition):

Sejeng, Manare C. “Understanding variability across the Crossroad transect from 3 years (2013 to 2015) of hydrographic data.” 2018. Masters Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29425.

MLA Handbook (7^th Edition):

Sejeng, Manare C. “Understanding variability across the Crossroad transect from 3 years (2013 to 2015) of hydrographic data.” 2018. Web. 22 Sep 2019.

Vancouver:

Sejeng MC. Understanding variability across the Crossroad transect from 3 years (2013 to 2015) of hydrographic data. [Internet] [Masters thesis]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29425.

Council of Science Editors:

Sejeng MC. Understanding variability across the Crossroad transect from 3 years (2013 to 2015) of hydrographic data. [Masters Thesis]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29425

University of Cape Town

21. Burls, Natalie. The role of ocean dynamics within tropical Atlantic climate variability.

Degree: Image, Oceanography, 2010, University of Cape Town

URL: http://hdl.handle.net/11427/10262

► Capitalising on the vast knowledge gained in the tropical Pacific, tropical Atlantic variability is viewed from an energetics perspective and contrasted against the Pacific at… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Burls, N. (2010). The role of ocean dynamics within tropical Atlantic climate variability. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/10262

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):

Burls, Natalie. “The role of ocean dynamics within tropical Atlantic climate variability.” 2010. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/10262.

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

MLA Handbook (7^th Edition):

Burls, Natalie. “The role of ocean dynamics within tropical Atlantic climate variability.” 2010. Web. 22 Sep 2019.

Vancouver:

Burls N. The role of ocean dynamics within tropical Atlantic climate variability. [Internet] [Thesis]. University of Cape Town; 2010. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/10262.

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

Council of Science Editors:

Burls N. The role of ocean dynamics within tropical Atlantic climate variability. [Thesis]. University of Cape Town; 2010. Available from: http://hdl.handle.net/11427/10262

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

University of Cape Town

22. Manatsa, Desmond. Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall.

Degree: Image, Oceanography, 2010, University of Cape Town

URL: http://hdl.handle.net/11427/6491

► This thesis discusses the approach taken by the South African government in response to the political and economic crisis that has gripped neighbouring Zimbabwe since… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Manatsa, D. (2010). Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/6491

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):

Manatsa, Desmond. “Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall.” 2010. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/6491.

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

MLA Handbook (7^th Edition):

Manatsa, Desmond. “Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall.” 2010. Web. 22 Sep 2019.

Vancouver:

Manatsa D. Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall. [Internet] [Thesis]. University of Cape Town; 2010. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/6491.

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

Council of Science Editors:

Manatsa D. Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall. [Thesis]. University of Cape Town; 2010. Available from: http://hdl.handle.net/11427/6491

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

University of Cape Town

23. Lamont, Tarron. Bio-optical investigation of phytoplankton production in the southern Benguela ecosystem.

Degree: Image, Oceanography, 2011, University of Cape Town

URL: http://hdl.handle.net/11427/11138

This study aims to evaluate various existing models for the estimation of PP in the southern Benguela ecosystem, and to investigate the photophysiological responses of phytoplankton to changes in environmental conditions. Advisors/Committee Members: Barlow, RG (advisor), Shillington, Frank (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lamont, T. (2011). Bio-optical investigation of phytoplankton production in the southern Benguela ecosystem. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/11138

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):

Lamont, Tarron. “Bio-optical investigation of phytoplankton production in the southern Benguela ecosystem.” 2011. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/11138.

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

MLA Handbook (7^th Edition):

Lamont, Tarron. “Bio-optical investigation of phytoplankton production in the southern Benguela ecosystem.” 2011. Web. 22 Sep 2019.

Vancouver:

Lamont T. Bio-optical investigation of phytoplankton production in the southern Benguela ecosystem. [Internet] [Thesis]. University of Cape Town; 2011. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/11138.

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

Council of Science Editors:

Lamont T. Bio-optical investigation of phytoplankton production in the southern Benguela ecosystem. [Thesis]. University of Cape Town; 2011. Available from: http://hdl.handle.net/11427/11138

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

University of Cape Town

24. Collins, Charine. The dynamics and physical processes of the Comoros Basin.

Degree: Image, Oceanography, 2013, University of Cape Town

URL: http://hdl.handle.net/11427/6467

► The main objective of this thesis was to investigate the circulation in the ComorosBasin using observed and model datasets. These data were used to establish… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Collins, C. (2013). The dynamics and physical processes of the Comoros Basin. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/6467

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):

Collins, Charine. “The dynamics and physical processes of the Comoros Basin.” 2013. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/6467.

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

MLA Handbook (7^th Edition):

Collins, Charine. “The dynamics and physical processes of the Comoros Basin.” 2013. Web. 22 Sep 2019.

Vancouver:

Collins C. The dynamics and physical processes of the Comoros Basin. [Internet] [Thesis]. University of Cape Town; 2013. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/6467.

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

Council of Science Editors:

Collins C. The dynamics and physical processes of the Comoros Basin. [Thesis]. University of Cape Town; 2013. Available from: http://hdl.handle.net/11427/6467

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

University of Cape Town

25. Dilmahamod Ahmad Fehmi. The biophysical processes controlling the South-East Madagascar Bloom.

Degree: PhD, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29265

► Phytoplankton blooms are ecological hotspots in the ocean, and are fundamental to the biogeochemical cycling of elements, the storage of carbon and the ability to… (more)

▼ Phytoplankton blooms are ecological hotspots in the ocean, and are fundamental to the biogeochemical cycling of elements, the storage of carbon and the ability to regulate the atmospheric carbon dioxide; and the life in the ocean. The South-East Madagascar Bloom, one of the largest blooms in the global ocean, coexists with the poleward flowing South-East Madagascar Current (SEMC), the eastward flowing South Indian Ocean Countercurrent (SICC) as well as westward-propagating surface and subsurface-intensified eddies. This austral summer bloom extends largely towards the open ocean, from the Madagascan coasts up to ~65°E and it exhibits an intriguing interannual variability. A variety of observational datasets as well as a high resolution coupled physical-biogeochemical model, based on CROCOPISCES, are used to explore the biophysical processes associated with the bloom and these westward-propagating eddies. Based on historical observational data, the bloom is shown to occur in a region of shallow mixed layer, with the surface layer exhibiting lower salinity, a possible signature of the coastal poleward flowing SEMC waters. The testing of various hypotheses revealed a dampening of the coastal current-driven upwelling south-east of Madagascar during bloom months. A dipole mesoscale feature is also prevalent close to the Madagascan coast during the bloom, from which a new hypothesis emerges. This new hypothesis states that the region south/south-east of Madagascar, influenced by local mesoscale turbulence, acts as a gate for the SEMC to flow either towards the African continent, or into the bloom region through an early retroflection, hence fertilizing the bloom. The model produces a sporadic enhancement of chlorophyll-a in the subsurface levels, associated with a low-salinity surface signature. The mean local circulation associated with the simulated bloom also reveals a dipole structure, as in observed datasets. Nitrate from subsurface levels (upwelling) as well as from the Madagascan coast (advection) is shown to influence the simulated bloom. A Lagrangian experiment shows dispersion of higher percentages of particles in the bloom region during bloom years and south of Madagascar during non-bloom years. Mesoscale eddies, originating close to Australia and which propagate westward towards southern Africa, can potentially impact the South-East Madagascar Bloom. In this study, a vast majority of these features have been shown to be subsurface-intensified eddies. A co-located eddy tracking dataset with Argo profiling floats are used to devise a subsurface-eddy identification method, which is based on the steric dynamic height anomaly of a specific eddy. Adding to the `eddy-zoo', these eddies are termed `SIDDIES' (South Indian ocean eDDIES), occurring as surface (surfSIDDIES) and subsurface (subSIDDIES) features. They travel along the latitudinal band range of 15°S to 35°S which we name the ‘SIDDIES corridor’. Advecting warm and fresh water during their propagation, cyclonic (anticyclonic) subSIDDIES contribute about 58%… Advisors/Committee Members: Reason Christopher (advisor).

Subjects/Keywords: oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Fehmi, D. A. (2018). The biophysical processes controlling the South-East Madagascar Bloom. (Doctoral Dissertation). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29265

Chicago Manual of Style (16^th Edition):

Fehmi, Dilmahamod Ahmad. “The biophysical processes controlling the South-East Madagascar Bloom.” 2018. Doctoral Dissertation, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29265.

MLA Handbook (7^th Edition):

Fehmi, Dilmahamod Ahmad. “The biophysical processes controlling the South-East Madagascar Bloom.” 2018. Web. 22 Sep 2019.

Vancouver:

Fehmi DA. The biophysical processes controlling the South-East Madagascar Bloom. [Internet] [Doctoral dissertation]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29265.

Council of Science Editors:

Fehmi DA. The biophysical processes controlling the South-East Madagascar Bloom. [Doctoral Dissertation]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29265

University of Cape Town

26. Nguvava, Mariam. The effect of nutrient limitation and oxidative stress on bromoform production from axenic cultures of marine diatoms.

Degree: Image, Oceanography, 2012, University of Cape Town

URL: http://hdl.handle.net/11427/11053

► Bromoform is mainly produced naturally by marine organisms. The production by microalgae however is not well quantified, and the mechanism by which phytoplankton produce bromoform… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Nguvava, M. (2012). The effect of nutrient limitation and oxidative stress on bromoform production from axenic cultures of marine diatoms. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/11053

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):

Nguvava, Mariam. “The effect of nutrient limitation and oxidative stress on bromoform production from axenic cultures of marine diatoms.” 2012. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/11053.

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

MLA Handbook (7^th Edition):

Nguvava, Mariam. “The effect of nutrient limitation and oxidative stress on bromoform production from axenic cultures of marine diatoms.” 2012. Web. 22 Sep 2019.

Vancouver:

Nguvava M. The effect of nutrient limitation and oxidative stress on bromoform production from axenic cultures of marine diatoms. [Internet] [Thesis]. University of Cape Town; 2012. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/11053.

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

Council of Science Editors:

Nguvava M. The effect of nutrient limitation and oxidative stress on bromoform production from axenic cultures of marine diatoms. [Thesis]. University of Cape Town; 2012. Available from: http://hdl.handle.net/11427/11053

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

University of Cape Town

27. Munnik, Kate Caroline. The relationship between coastal oceanographic variability and the spatial distribution of Argyrosomus coronus on the west coast of southern Africa.

Degree: Image, Oceanography, 2012, University of Cape Town

URL: http://hdl.handle.net/11427/12102

► The northern Benguela, under the influence of the opposing forces of the poleward Angola Current and the eastern boundary Benguela upwelling regime is a highly… (more)

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Munnik, K. C. (2012). The relationship between coastal oceanographic variability and the spatial distribution of Argyrosomus coronus on the west coast of southern Africa. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/12102

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):

Munnik, Kate Caroline. “The relationship between coastal oceanographic variability and the spatial distribution of Argyrosomus coronus on the west coast of southern Africa.” 2012. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/12102.

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

MLA Handbook (7^th Edition):

Munnik, Kate Caroline. “The relationship between coastal oceanographic variability and the spatial distribution of Argyrosomus coronus on the west coast of southern Africa.” 2012. Web. 22 Sep 2019.

Vancouver:

Munnik KC. The relationship between coastal oceanographic variability and the spatial distribution of Argyrosomus coronus on the west coast of southern Africa. [Internet] [Thesis]. University of Cape Town; 2012. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/12102.

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

Council of Science Editors:

Munnik KC. The relationship between coastal oceanographic variability and the spatial distribution of Argyrosomus coronus on the west coast of southern Africa. [Thesis]. University of Cape Town; 2012. Available from: http://hdl.handle.net/11427/12102

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

University of Cape Town

28. Mongwe, Ndunisani Precious. Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle.

Degree: PhD, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29260

► The Southern Ocean forms a vital component of the earth system as a sink of CO2 and heat, taking over 40% of the annual oceanic… (more)

▼ The Southern Ocean forms a vital component of the earth system as a sink of CO2 and heat, taking over 40% of the annual oceanic CO2 uptake (75% of global heat uptake), slowing down the accumulation of CO2 in the atmosphere and thus the rate of climate change. However, recent studies based on the Coupled Model Intercomparison Project version 5 (CMIP5) Earth System Models (ESMs) show that CMIP5 ESMs disagree on the phasing of the seasonal cycle of the CO2 flux (FCO2) and compare poorly with available observation estimates in the Southern Ocean. Notwithstanding these differences, the seasonal cycle is a dominant mode of CO2 variability in the Southern Ocean, and hence this is an important bias. Previous studies suggest that these biases of FCO2 in ESMs might be a significant limitation to the long-term simulation of CO2 characteristics in the Southern Ocean. Consequently, this study has three primary objectives: first, to develop a process-based diagnostic method to analyze and isolate key biases and their underlaying mechanisms in the model-observations seasonal cycle of FCO2 differences for forced ocean models and ESMs. Second, to use this framework to examine sources of biases responsible for the limited skill of CMIP5 models in simulating the seasonal cycle of FCO2 with respect to observed estimates. Thirdly, to investigate how these present-day biases in the seasonality and drivers of CO2 in CMIP5 ESMs affect modelled longterm changes in the mechanisms of CO2 uptake in the Southern Ocean. In the first part of the dissertation, an objective diagnostic framework was established to analyze model-observation biases in the seasonal scale of FCO2 using the NEMO PISCES ORCA2LP model output, and Takahashi et al. (2009) observed estimates. The diagnostic framework focuses on examining the relative contributions of the competing drivers (SST and DIC) and related processes (solubility, biological and mixing) to instantaneous monthly changes in surface pCO2 (and FCO2) at the seasonal scale. In the second part of the dissertation, this approach is applied to 10 CMIP5 models in the Southern Ocean, to investigate the mechanistic basis for the seasonal cycle of FCO2 biases. It was found that FCO2 biases in CMIP5 models can be grouped into two main categories, i.e. group-SST and group-DIC. Group-SST models are characterized by an exaggeration of the seasonal rates of change of Sea Surface Temperature (SST) in autumn and spring during the cooling and warming peaks, respectively. These faster-than-observed rates of change of SST tip the control of the seasonal cycle of pCO2 and FCO2 towards SST and result in divergence between the observed and modelled seasonal cycles, particularly in the Sub-Antarctic Zone. While almost all analyzed models show these SST-driven biases, 3 out of 10 (namely NorESM1-ME, HadGEM2-ES and MPI-ESM, collectively the group-DIC models) compensate the solubility bias because of their exaggerated primary production, such that biologically-driven DIC changes become the regulators of the seasonal cycle of FCO2. It… Advisors/Committee Members: Monteiro, Pedro M S (advisor), Vichi, Marcello (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Mongwe, N. P. (2018). Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle. (Doctoral Dissertation). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29260

Chicago Manual of Style (16^th Edition):

Mongwe, Ndunisani Precious. “Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle.” 2018. Doctoral Dissertation, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29260.

MLA Handbook (7^th Edition):

Mongwe, Ndunisani Precious. “Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle.” 2018. Web. 22 Sep 2019.

Vancouver:

Mongwe NP. Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle. [Internet] [Doctoral dissertation]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29260.

Council of Science Editors:

Mongwe NP. Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle. [Doctoral Dissertation]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29260

University of Cape Town

29. Imbol, Koungue Rodrigue Anicet. A study of Benguela Niños and Niñas from 1958 to 2015.

Degree: PhD, Oceanography, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/29288

► Prediction and Research Moored Array in the Tropical Atlantic (PIRATA) records in combination with outputs from an Ocean Linear Model (OLM) and altimetric data are… (more)

▼ Prediction and Research Moored Array in the Tropical Atlantic (PIRATA) records in combination with outputs from an Ocean Linear Model (OLM) and altimetric data are used to investigate the link between the equatorial Atlantic Ocean dynamics and the variability in the coastal region of Angola-Namibia at interannual timescales over 1998 to 2012. The PIRATA records help to define an index of equatorial Kelvin wave activities in the Equatorial Atlantic. There is a good agreement between PIRATA monthly dynamic height anomalies, altimetric monthly sea surface height anomalies (SSHA), and sea level anomalies calculated with an OLM at interannual time scales. This allows the interpretation of PIRATA records in terms of equatorial Kelvin wave propagations. Extreme warm or cold events in the Angola – Namibia area lag strong anomalous eastward equatorial propagations by 1–2 months. Remote equatorial forcing via equatorial Kelvin waves which propagate poleward along the west African coast as coastal trapped waves is at the origin of their developments. Results show a seasonal phasing, with significantly higher correlations between the equatorial index and coastal sea surface temperature anomalies (SSTA) off Angola-Namibia in October - April season. Then, a systematic study of all the Benguela Niño and Benguela Niña events before 1982 is done using an Ocean general circulation model in combination with the OLM outputs from 1958 to 2015. 26 anomalous strong coastal events (16 warm and 10 cold) are identified. The analysis of their evolution confirms the remote equatorial origin of most of these coastal anomalous strong events. Modelled meridional transport anomalies across the Angola Benguela Front (ABF) contribute to the development of these anomalous coastal warm events. Across the ABF, the results obtain with the net temperature transport are similar to the ones with net mass transport. Most anomalous events peak in October - April season. Lagged composites of surface temperature and wind stress anomalies in the equatorial and southeastern Atlantic reveal that both local and remote forcings develop simultaneously 1-2 months before the peak of Benguela Niño or Niña. At the monthly scale, local atmospheric forcing is more correlated with anomalous coastal events occurring in Southern Angola which is a non-wind-upwelling driven region. The results from this thesis open the possibility to predict Benguela Niño and Benguela Niña events using an index depicting the equatorial interannual variability associated with Interannual Equatorial Kelvin Wave propagation, especially from October to April when the coastal stratification is favourable to the imprint of coastal trapped waves in the surface layer. Advisors/Committee Members: Rouault, Mathieu (advisor), Illig, Serena (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Imbol, K. R. A. (2018). A study of Benguela Niños and Niñas from 1958 to 2015. (Doctoral Dissertation). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29288

Chicago Manual of Style (16^th Edition):

Imbol, Koungue Rodrigue Anicet. “A study of Benguela Niños and Niñas from 1958 to 2015.” 2018. Doctoral Dissertation, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/29288.

MLA Handbook (7^th Edition):

Imbol, Koungue Rodrigue Anicet. “A study of Benguela Niños and Niñas from 1958 to 2015.” 2018. Web. 22 Sep 2019.

Vancouver:

Imbol KRA. A study of Benguela Niños and Niñas from 1958 to 2015. [Internet] [Doctoral dissertation]. University of Cape Town; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/29288.

Council of Science Editors:

Imbol KRA. A study of Benguela Niños and Niñas from 1958 to 2015. [Doctoral Dissertation]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29288

University of Cape Town

30. Cooper, Kyle Francis. Evaluating global ocean reanalysis systems for the greater Agulhas Current System.

Degree: Image, Oceanography, 2014, University of Cape Town

URL: http://hdl.handle.net/11427/12829

► Operational oceanography aims to accurately hindcast and forecast the state of the ocean. An international initiative, the Global Ocean Data Assimilation Experiment (GODAE), developed and… (more)

▼ Operational oceanography aims to accurately hindcast and forecast the state of the ocean. An international initiative, the Global Ocean Data Assimilation Experiment (GODAE), developed and increased the capacity for global operational oceanography. However, the products from the global initiatives were regionally inapplicable due to low spatial resolutions, and have recently improved through GODAE OceanView. A number of local operational oceanographic initiatives have been setup over the southern African regional ocean, but proved to be unsustainable and ended. Recently, the aim to develop a regional ocean prediction system has arisen, and initial steps have been taken. This thesis aims to address the lack of local capacity in operational oceanography, and contribute to a crucial process in developing a regional ocean prediction system. Here, we validate and investigate the differences between three global reanalysis products, namely MyOcean (GLORYS2V1), HYCOM (U.S Naval Research Laboratory) and BlueLINK (OFAM3). These reanalysis products are validated and investigated over the greater Agulhas Current System, which is a crucial system in Southern African regional ocean. The salient oceanographic features represented in the reanalysis products are initially compared to historical literature of the region and followed by available unassimilated observations (i.e. independent). The results show that the reanalysis products from MyOcean, and the U.S Naval Research Laboratory satisfactorily simulate the major salient oceanographic features of the Agulhas Current System. Bluelink does not correctly portray the structure of the source and retroflection regions, and therefore has limited use over the Agulhas Current System. The differences between the three products indicates that the data assimilate does not sufficiently constrain the models in order for their solutions over the Agulhas System to converge. The evaluation of these global ocean reanalysis products is a critical step toward a regional ocean prediction system over Southern Africa, and building toward the local capacity to accomplish this goal. Advisors/Committee Members: Backeberg, Bjorn Christoph (advisor), Hermes, Juliet C (advisor), Deshayes, Julie (advisor), Veitch, Jennifer Anne (advisor).

Subjects/Keywords: Oceanography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Cooper, K. F. (2014). Evaluating global ocean reanalysis systems for the greater Agulhas Current System. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/12829

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):

Cooper, Kyle Francis. “Evaluating global ocean reanalysis systems for the greater Agulhas Current System.” 2014. Thesis, University of Cape Town. Accessed September 22, 2019. http://hdl.handle.net/11427/12829.

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

MLA Handbook (7^th Edition):

Cooper, Kyle Francis. “Evaluating global ocean reanalysis systems for the greater Agulhas Current System.” 2014. Web. 22 Sep 2019.

Vancouver:

Cooper KF. Evaluating global ocean reanalysis systems for the greater Agulhas Current System. [Internet] [Thesis]. University of Cape Town; 2014. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11427/12829.

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

Council of Science Editors:

Cooper KF. Evaluating global ocean reanalysis systems for the greater Agulhas Current System. [Thesis]. University of Cape Town; 2014. Available from: http://hdl.handle.net/11427/12829

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

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations