subject:( ENSO)

University of Hawaii – Manoa

1. O'Connor, Chris Foster. Variability of Hawaiʻian winter rainfall during La Niña events since 1956.

Degree: 2015, University of Hawaii – Manoa

►

M.S. University of Hawaii at Manoa 2014.

Rainfall trends in Hawaiʻi during La Niña years have undergone abnormal variability since the early 1980s, making seasonal… (more)

Subjects/Keywords: ENSO

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

O'Connor, C. F. (2015). Variability of Hawaiʻian winter rainfall during La Niña events since 1956. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/100389

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):

O'Connor, Chris Foster. “Variability of Hawaiʻian winter rainfall during La Niña events since 1956.” 2015. Thesis, University of Hawaii – Manoa. Accessed December 13, 2019. http://hdl.handle.net/10125/100389.

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

MLA Handbook (7^th Edition):

O'Connor, Chris Foster. “Variability of Hawaiʻian winter rainfall during La Niña events since 1956.” 2015. Web. 13 Dec 2019.

Vancouver:

O'Connor CF. Variability of Hawaiʻian winter rainfall during La Niña events since 1956. [Internet] [Thesis]. University of Hawaii – Manoa; 2015. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/10125/100389.

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

Council of Science Editors:

O'Connor CF. Variability of Hawaiʻian winter rainfall during La Niña events since 1956. [Thesis]. University of Hawaii – Manoa; 2015. Available from: http://hdl.handle.net/10125/100389

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

NSYSU

2. Huang, Yu-hwa. ENSO effects on marine meteorology of adjacent waters surrounding Taiwan.

Degree: Master, Marine Resources, 2005, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0909105-115126

► Abstract In this study, the COADSï¼Comprehensive Ocean-Atmosphere Data Setï¼Long Marine Report Fixed Length Formatï¼LMRFï¼ data from 1996 to 2002 are used to investigate the seasonal… (more)

Subjects/Keywords: ENSO

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Huang, Y. (2005). ENSO effects on marine meteorology of adjacent waters surrounding Taiwan. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0909105-115126

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):

Huang, Yu-hwa. “ENSO effects on marine meteorology of adjacent waters surrounding Taiwan.” 2005. Thesis, NSYSU. Accessed December 13, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0909105-115126.

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

MLA Handbook (7^th Edition):

Huang, Yu-hwa. “ENSO effects on marine meteorology of adjacent waters surrounding Taiwan.” 2005. Web. 13 Dec 2019.

Vancouver:

Huang Y. ENSO effects on marine meteorology of adjacent waters surrounding Taiwan. [Internet] [Thesis]. NSYSU; 2005. [cited 2019 Dec 13]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0909105-115126.

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

Council of Science Editors:

Huang Y. ENSO effects on marine meteorology of adjacent waters surrounding Taiwan. [Thesis]. NSYSU; 2005. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0909105-115126

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

University of Miami

3. Kapur, Atul. Role of Madden-Julian Oscillation and Its Modulation by the Sea Surface Temperature in El Niño—Southern Oscillation.

Degree: PhD, Meteorology and Physical Oceanography (Marine), 2013, University of Miami

URL: https://scholarlyrepository.miami.edu/oa_dissertations/1123

► A parameterization is designed to study the role of Madden-Julian Oscillation (MJO) and the modulation by sea surface temperature (SST) in El Niño—Southern Oscillation (ENSO).… (more)

▼ A parameterization is designed to study the role of Madden-Julian Oscillation (MJO) and the modulation by sea surface temperature (SST) in El Niño—Southern Oscillation (ENSO). It is added to a coupled ocean-atmosphere model of intermediate complexity and to a coupled general circulation model (CGCM) that does not any generate internal MJO. The MJO parameters acquire values either additively, i.e. randomly from observed distributions, or multiplicatively, i.e. modulated by evolving model ENSO-SST, albeit with some stochasticity. Sensitivity tests using the intermediate model reveal the complexity of MJO-ENSO relationship: e.g. ENSO strengthens with increase in either the stochasticity of amplitude or the degree of its SST-modulation, but similar relationships are not evident for speed and zonal extent. Ensemble comparisons between simulations with and without SST-feedback suggest that SST feedback to the MJO acting in a stable regime can be responsible for the observed ENSO variance. The multiplicative case has a larger ensemble spread than the additive case, which manifests in a larger interdecadal variability of ENSO. Long-term simulations of the CGCM reveal that although the unrealistic 2-yr ENSO period is retained upon the inclusion of additive or multiplicative MJO, there is a disruption in the biennial regularity of ENSO. The timing and occurrence of El Niños become dependent on the timing of MJO activity, which manifests in unseasonal ENSO peaks and reduced interannual power. These constraints on El Niño are linked to the seasonal curtailment of eastward propagating upper ocean anomalies by the easterlies that intersperse MJO westerlies. The power is partially restored in the multiplicative case, where the enhancement of MJO westerlies during warming phase leads to stronger subsequent peaks. Re-simulations performed by switching the MJO presence or SST-dependence at a strategically chosen time demonstrate that the SST-feedback to the MJO has almost as much impact on the evolution of ENSO anomalies as the random component of the MJO. Advisors/Committee Members: Chidong Zhang, Benjamin Kirtman, Brian E. Mapes, Eli Tziperman.

Subjects/Keywords: ENSO; MJO

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Kapur, A. (2013). Role of Madden-Julian Oscillation and Its Modulation by the Sea Surface Temperature in El Niño—Southern Oscillation. (Doctoral Dissertation). University of Miami. Retrieved from https://scholarlyrepository.miami.edu/oa_dissertations/1123

Chicago Manual of Style (16^th Edition):

Kapur, Atul. “Role of Madden-Julian Oscillation and Its Modulation by the Sea Surface Temperature in El Niño—Southern Oscillation.” 2013. Doctoral Dissertation, University of Miami. Accessed December 13, 2019. https://scholarlyrepository.miami.edu/oa_dissertations/1123.

MLA Handbook (7^th Edition):

Kapur, Atul. “Role of Madden-Julian Oscillation and Its Modulation by the Sea Surface Temperature in El Niño—Southern Oscillation.” 2013. Web. 13 Dec 2019.

Vancouver:

Kapur A. Role of Madden-Julian Oscillation and Its Modulation by the Sea Surface Temperature in El Niño—Southern Oscillation. [Internet] [Doctoral dissertation]. University of Miami; 2013. [cited 2019 Dec 13]. Available from: https://scholarlyrepository.miami.edu/oa_dissertations/1123.

Council of Science Editors:

Kapur A. Role of Madden-Julian Oscillation and Its Modulation by the Sea Surface Temperature in El Niño—Southern Oscillation. [Doctoral Dissertation]. University of Miami; 2013. Available from: https://scholarlyrepository.miami.edu/oa_dissertations/1123

Princeton University

4. Li, Ying. Dynamical Mechanisms for the Teleconnection between ENSO and NAO in Late Winter .

Degree: PhD, 2011, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp0147429914k

► The dynamical mechanisms for the late-winter teleconnection between El Nino-Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO) are examined using output from two global… (more)

▼ The dynamical mechanisms for the late-winter teleconnection between El Nino-Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO) are examined using output from two global climate models and various reanalysis datasets. During El Nino winters, the intensified transient disturbances along the equatorward shifted North Pacific storm track extend their influences farther downstream, thereby leading to eastward extension of eddy vorticity forcing to the North Atlantic region. Such eddy forcing induces negative geopotential height tendencies along the southern lobe of the NAO, thus favoring more occurrences of negative NAO events. It is further demonstrated that these transient eddy effects can be reproduced in atmospheric GCM integrations subjected to ENSO-related SST anomalies in the tropical Pacific region. Analysis of the persistent anomalous circulation episodes in the North Pacific-North America-North Atlantic sector further demonstrate the contributions of downstream eddy development to the ENSO/NAO teleconnection. These episodes are characterized by a strengthened Pacific subtropical jet stream and an equatorward-shifted Pacific storm track. The wave packets that populate the storm tracks travel eastward through downstream development. The pursuant barotropic forcing of the embedded synoptic-scale eddies is conducive to the formation of the negative phase of the NAO. The more frequent and higher persistence of those episodes during El Nino winters contribute to the prevalence of negative NAO conditions. A higher frequency of weak (strong) stratospheric vortex events for El Nino (La Nina) condition is generated in a climate model with a more realistic upper atmosphere. During El Nino events, the enhanced tropospheric stationary wave-1 driving contributes to the increased frequency of stratospheric weak vortex events. The easterly wind anomalies induced by Eliassen-Palm (EP)-flux convergence over the polar cap propagate downward to the lower stratosphere/upper troposphere. Anomalous westerly in the subtropics cannot be explained by the stratospheric planetary-wave-mean-flow interaction. Rather, it is driven by the upper tropospheric eddy momentum flux convergence, which in turn results from strong poleward wave refraction. This upper-tropospheric westerly anomaly is linked to the lower-troposphere via the eddy-driven tropospheric overturning circulation, and the resulting SLP anomaly response resembles the negative NAO in the North Atlantic region. Advisors/Committee Members: Lau, Ngar-Cheung (advisor).

Subjects/Keywords: ENSO; NAO; Teleconnection

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Li, Y. (2011). Dynamical Mechanisms for the Teleconnection between ENSO and NAO in Late Winter . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp0147429914k

Chicago Manual of Style (16^th Edition):

Li, Ying. “Dynamical Mechanisms for the Teleconnection between ENSO and NAO in Late Winter .” 2011. Doctoral Dissertation, Princeton University. Accessed December 13, 2019. http://arks.princeton.edu/ark:/88435/dsp0147429914k.

MLA Handbook (7^th Edition):

Li, Ying. “Dynamical Mechanisms for the Teleconnection between ENSO and NAO in Late Winter .” 2011. Web. 13 Dec 2019.

Vancouver:

Li Y. Dynamical Mechanisms for the Teleconnection between ENSO and NAO in Late Winter . [Internet] [Doctoral dissertation]. Princeton University; 2011. [cited 2019 Dec 13]. Available from: http://arks.princeton.edu/ark:/88435/dsp0147429914k.

Council of Science Editors:

Li Y. Dynamical Mechanisms for the Teleconnection between ENSO and NAO in Late Winter . [Doctoral Dissertation]. Princeton University; 2011. Available from: http://arks.princeton.edu/ark:/88435/dsp0147429914k

5. NOREñA GUTIERREZ, MARIANA. Ens? .

Degree: 2016, Universidad de los Andes

URL: https://documentodegrado.uniandes.edu.co/documentos/9882.pdf

► Enso? es una vajilla dirigida a jóvenes adultos, que se encuentran en un momento de transición en el cual comienzan una vida como adultos independientes.… (more)

Subjects/Keywords: Enso Vajilla

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

NOREñA GUTIERREZ, M. (2016). Ens? . (Thesis). Universidad de los Andes. Retrieved from https://documentodegrado.uniandes.edu.co/documentos/9882.pdf

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

Chicago Manual of Style (16^th Edition):

NOREñA GUTIERREZ, MARIANA. “Ens? .” 2016. Thesis, Universidad de los Andes. Accessed December 13, 2019. https://documentodegrado.uniandes.edu.co/documentos/9882.pdf.

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

MLA Handbook (7^th Edition):

NOREñA GUTIERREZ, MARIANA. “Ens? .” 2016. Web. 13 Dec 2019.

Vancouver:

NOREñA GUTIERREZ M. Ens? . [Internet] [Thesis]. Universidad de los Andes; 2016. [cited 2019 Dec 13]. Available from: https://documentodegrado.uniandes.edu.co/documentos/9882.pdf.

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

Council of Science Editors:

NOREñA GUTIERREZ M. Ens? . [Thesis]. Universidad de los Andes; 2016. Available from: https://documentodegrado.uniandes.edu.co/documentos/9882.pdf

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

University of Cambridge

6. Lai, Wang Chun. Characterisations of different El Nino types, their physical causes and predictions.

Degree: PhD, 2018, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/271824 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744512

► El Niño Southern Oscillation (ENSO) is the most important interannual mode of climate variability in the tropical Pacific affecting the globe through teleconnections. The evolution… (more)

▼ El Niño Southern Oscillation (ENSO) is the most important interannual mode of climate variability in the tropical Pacific affecting the globe through teleconnections. The evolution of ENSO is studied with focus on individual El Nino (EN) events; factors and processes explaining the behaviours of different EN flavours are identified. The comparison to model simulations reveals a number of biases that explain differences in model behaviour. Based on reanalysis data, ENs are divided into Central Pacific (CPEN), Eastern Pacific (EPEN), and Hybrid (HBEN). ENs are found to form a continuous spectrum of events with CPEN and EPEN as its end members depending on: (1) the Western Pacific subsurface potential temperature anomaly (PTA) about 1 year before the EN peak, and (2) the Western to Central Pacific cumulative zonal wind anomaly (ZWA) between the onset and peak of the EN. Using these two parameters, about 70% of the total variance of the maximum EN SSTA can be explained up to 6 months in advance. ZWA describes the potential for triggering Kelvin waves for a given initial West Pacific recharge state as captured by PTA. A cross-validated statistical model is developed to hindcast the 1980-2016 Nov-Dec-Jan (NDJ) mean Niño3.4 SSTA based on the two parameters. The model is comparable to, or even outperforms, many NOAA Climate Prediction Centre's statistical models during the boreal spring predictability barrier. The explained variance between observed and predicted NDJ Niño3.4 SSTA at a lead-time of 8 months is 57% using five years for cross-validation. Predictive skills are lower after 2000 when the mean climate state is more La Niña-like due to stronger equatorial easterly ZWA caused by an intensification of both, Walker and Hadley cell. The ability of climate models to simulate and predict EN is assessed with data from the Climate Model Inter-comparison Project 5 (CMIP5). Most models are able to capture the main features of different EN types. But models struggle to reproduce large intensity ENs as found in observations. This issue can be traced back to a failure to realistically simulate the oceanic recharged state and the subsequent Kelvin waves for intense EN. Causes of EN involve Kelvin waves that are triggered by westerly wind bursts (WWB). From higher temporal resolution of reanalysis data, WWBs above a certain threshold are required to trigger a Kelvin wave. Kelvin waves are triggered in locations of positive Ocean Heat Content (OHC) anomalies. Intensity, longitudinal coverage and duration of a WWB, the strength of the OHC anomaly and gradient influence the amplitude of Kelvin waves as they propagate. Synoptic pattern analysis suggests that most WWBs are caused by cyclones with the combination of an active Madden-Julian Oscillation. The NorESM is able to reproduce many characteristics of observed WWBs, OHC anomalies and their relation to Kelvin waves. However, differences are noticeable for the distribution of synoptic patterns causing WWBs in the model. In future work, climate models can be used to disentangle…

Subjects/Keywords: El Nino; Climate variability; ENSO

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lai, W. C. (2018). Characterisations of different El Nino types, their physical causes and predictions. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/271824 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744512

Chicago Manual of Style (16^th Edition):

Lai, Wang Chun. “Characterisations of different El Nino types, their physical causes and predictions.” 2018. Doctoral Dissertation, University of Cambridge. Accessed December 13, 2019. https://www.repository.cam.ac.uk/handle/1810/271824 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744512.

MLA Handbook (7^th Edition):

Lai, Wang Chun. “Characterisations of different El Nino types, their physical causes and predictions.” 2018. Web. 13 Dec 2019.

Vancouver:

Lai WC. Characterisations of different El Nino types, their physical causes and predictions. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2019 Dec 13]. Available from: https://www.repository.cam.ac.uk/handle/1810/271824 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744512.

Council of Science Editors:

Lai WC. Characterisations of different El Nino types, their physical causes and predictions. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://www.repository.cam.ac.uk/handle/1810/271824 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744512

Clemson University

7. Warner, Kristi. Tidal Heating and MLT Tidal Wind Variability Due to the El Nino-Southern Oscillation.

Degree: MS, Physics, 2013, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/1708

► Tides forced by large-scale weather systems in the tropical troposphere in- troduce significant longitudinal and local time variability in the upper atmosphere. This thesis… (more)

Subjects/Keywords: ENSO; MLT; Tides; Physics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Warner, K. (2013). Tidal Heating and MLT Tidal Wind Variability Due to the El Nino-Southern Oscillation. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1708

Chicago Manual of Style (16^th Edition):

Warner, Kristi. “Tidal Heating and MLT Tidal Wind Variability Due to the El Nino-Southern Oscillation.” 2013. Masters Thesis, Clemson University. Accessed December 13, 2019. https://tigerprints.clemson.edu/all_theses/1708.

MLA Handbook (7^th Edition):

Warner, Kristi. “Tidal Heating and MLT Tidal Wind Variability Due to the El Nino-Southern Oscillation.” 2013. Web. 13 Dec 2019.

Vancouver:

Warner K. Tidal Heating and MLT Tidal Wind Variability Due to the El Nino-Southern Oscillation. [Internet] [Masters thesis]. Clemson University; 2013. [cited 2019 Dec 13]. Available from: https://tigerprints.clemson.edu/all_theses/1708.

Council of Science Editors:

Warner K. Tidal Heating and MLT Tidal Wind Variability Due to the El Nino-Southern Oscillation. [Masters Thesis]. Clemson University; 2013. Available from: https://tigerprints.clemson.edu/all_theses/1708

University of Cambridge

8. Lai, Wang Chun. Characterisations of Different El Nino Types, their Physical Causes and Predictions .

Degree: 2018, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/271824

► El Niño Southern Oscillation (ENSO) is the most important interannual mode of climate variability in the tropical Pacific affecting the globe through teleconnections. The evolution… (more)

▼ El Niño Southern Oscillation (ENSO) is the most important interannual mode of climate variability in the tropical Pacific affecting the globe through teleconnections. The evolution of ENSO is studied with focus on individual El Nino (EN) events; factors and processes explaining the behaviours of different EN flavours are identified. The comparison to model simulations reveals a number of biases that explain differences in model behaviour. Based on reanalysis data, ENs are divided into Central Pacific (CPEN), Eastern Pacific (EPEN), and Hybrid (HBEN). ENs are found to form a continuous spectrum of events with CPEN and EPEN as its end members depending on: (1) the Western Pacific subsurface potential temperature anomaly (PTA) about 1 year before the EN peak, and (2) the Western to Central Pacific cumulative zonal wind anomaly (ZWA) between the onset and peak of the EN. Using these two parameters, about 70% of the total variance of the maximum EN SSTA can be explained up to 6 months in advance. ZWA describes the potential for triggering Kelvin waves for a given initial West Pacific recharge state as captured by PTA. A cross-validated statistical model is developed to hindcast the 1980-2016 Nov-Dec-Jan (NDJ) mean Niño3.4 SSTA based on the two parameters. The model is comparable to, or even outperforms, many NOAA Climate Prediction Centre's statistical models during the boreal spring predictability barrier. The explained variance between observed and predicted NDJ Niño3.4 SSTA at a lead-time of 8 months is 57% using five years for cross-validation. Predictive skills are lower after 2000 when the mean climate state is more La Niña-like due to stronger equatorial easterly ZWA caused by an intensification of both, Walker and Hadley cell. The ability of climate models to simulate and predict EN is assessed with data from the Climate Model Inter-comparison Project 5 (CMIP5). Most models are able to capture the main features of different EN types. But models struggle to reproduce large intensity ENs as found in observations. This issue can be traced back to a failure to realistically simulate the oceanic recharged state and the subsequent Kelvin waves for intense EN. Causes of EN involve Kelvin waves that are triggered by westerly wind bursts (WWB). From higher temporal resolution of reanalysis data, WWBs above a certain threshold are required to trigger a Kelvin wave. Kelvin waves are triggered in locations of positive Ocean Heat Content (OHC) anomalies. Intensity, longitudinal coverage and duration of a WWB, the strength of the OHC anomaly and gradient influence the amplitude of Kelvin waves as they propagate. Synoptic pattern analysis suggests that most WWBs are caused by cyclones with the combination of an active Madden-Julian Oscillation. The NorESM is able to reproduce many characteristics of observed WWBs, OHC anomalies and their relation to Kelvin waves. However, differences are noticeable for the distribution of synoptic patterns causing WWBs in the model. In future work, climate models can be used to disentangle…

Subjects/Keywords: El Nino; Climate variability; ENSO

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lai, W. C. (2018). Characterisations of Different El Nino Types, their Physical Causes and Predictions . (Thesis). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/271824

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):

Lai, Wang Chun. “Characterisations of Different El Nino Types, their Physical Causes and Predictions .” 2018. Thesis, University of Cambridge. Accessed December 13, 2019. https://www.repository.cam.ac.uk/handle/1810/271824.

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

MLA Handbook (7^th Edition):

Lai, Wang Chun. “Characterisations of Different El Nino Types, their Physical Causes and Predictions .” 2018. Web. 13 Dec 2019.

Vancouver:

Lai WC. Characterisations of Different El Nino Types, their Physical Causes and Predictions . [Internet] [Thesis]. University of Cambridge; 2018. [cited 2019 Dec 13]. Available from: https://www.repository.cam.ac.uk/handle/1810/271824.

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

Council of Science Editors:

Lai WC. Characterisations of Different El Nino Types, their Physical Causes and Predictions . [Thesis]. University of Cambridge; 2018. Available from: https://www.repository.cam.ac.uk/handle/1810/271824

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

Tampere University

9. Lähteenmäki, Tuomas. Ympäristövastuun jäljillä : Stora Enso ja Kemijärven sellutehtaan lieteallaskeskustelu 2008-2017 .

Degree: 2017, Tampere University

URL: https://trepo.tuni.fi/handle/10024/101206

► Käsillä olevan kvalitatiivisen tapaustutkimuksen kohteena on Stora Enson ympäristövastuu Kemijärven sellutehtaan lietealtaan tapauksessa. Työn keskeinen kysymys on, voidaanko Stora Enso -yhtiön toteuttamat Kemijärven sellutehtaan lietealtaan… (more)

▼ Käsillä olevan kvalitatiivisen tapaustutkimuksen kohteena on Stora Enson ympäristövastuu Kemijärven sellutehtaan lietealtaan tapauksessa. Työn keskeinen kysymys on, voidaanko Stora Enso -yhtiön toteuttamat Kemijärven sellutehtaan lietealtaan puhdistustoimenpiteet vuosina 2008-2017 luokitella ympäristövastuultaan onnistuneiksi. Ympäristövastuun onnistumista lähestytään Eskolan ja Suorannan esittämän teoriasidonnaisen analyysin kautta. Ympäristövastuun onnistumisen kriteereinä pidetään John Elkingtonin yritysvastuuta käsittelevää triple-bottom line -mallia. Stora Enson toimintaa arvioidaan ympäristövastuukirjallisuudesta esiin tulleiden neljän ympäristövastuun kriteerin näkökulmasta. Kriteereitä ovat vastuullisuuden kustannustehokkuus, vastuullisuuden strateginen merkitys, ulkoisten ja sisäisten sidosryhmien vaatimukset sekä yrityksen suhde luontoon. Tutkimuksessa hyödynnettävän sisällönanalyysin kautta on identifioitu ne lietealtaan puhdistustoimenpiteet, joilla Stora Enso on pyrkinyt osoittamaan ympäristövastuutaan. Tutkimuksessa ei pyritä tekemään ennusteita tai testaamaan yksittäistä hypoteesia vaan tärkeimpänä päämääränä on puheena olevien tapahtumien kautta syntyvän kokonaisuuden tarkka ja olosuhteita ymmärtävä kriittinen kuvailu ja analyysi. Tutkimuksen aineistona hyödynnettyjen Pohjois-Suomen aluehallintoviraston ja korkeimman hallinto-oikeuden päätösten sekä Yleisradion uutisartikkeleiden kautta on saatu jäsenneltyä lietealtaan puhdistukseen liittyvä yhteiskunnallinen keskustelu ja kartoitettua asiaan liittyvät ympäristövastuulliset toimenpiteet. Tutkielman lähdeaineiston koostamisessa on systemaattisesti käyty läpi eri toimijoiden tuottamaa, ilmiötä eri tulokulmista ristivalaisevaa materiaalia. Näin siksi, että saataisiin mahdollisimman seikkaperäisesti eriteltyä lietealtaan ympäristövastuuprosessiin liittyvän vuoropuhelun kulkuja niin, että siihen sisältyvät syy ja seuraus -suhteet ilmenisivät koko valitun keskipitkän aikavälin (2008-2017) kestoisesti. Keskustelu lietealtaasta aloitettiin tehtaan sulkemisen myötä 2008. Tutkimuksen johtopäätelmät summataan yhteen seitsemän keskeisen havainnon kautta: Vaikka lietealtaan ympäristövastuuprosessi on yhä kesken, voidaan Stora Enson ympäristövastuun onnistumista kuvailla vähintäänkin ristiriitaiseksi. Vaikka yhtiö on noudattanut lainsäädäntöön perustuvaa vastuullisuutta, ovat korkean toimivallan omaavan viranomaisen jätetulkinta ja sidosryhmien saastuttamistulkinta yhtiön näkemyksistä hyvin poikkeavat. Kemijärven massaliikkeen rooli korostuu etenkin asian medianäkyvyydessä. Näkökulmaerot kulminoituvat saastuttaja maksaa -periaatteeseen, lietealtaan puhdistamisen taloudellisiin kustannuksiin sekä puhdistuksen mahdollisiin ympäristöhyötyihin. Kaikkiaan Kemijärven sellutehtaan lietealtaan tapaus näyttäytyy puheena olevalle kansainväliselle yhtiölle ilmeisen pienenä ongelmana, vaikka se on yleisen ympäristövastuun näkökulmasta hyvin relevantti puhuttaessa paikallisten ympäristöongelmien ratkaisusta.

Subjects/Keywords: Ympäristövastuu; yhteiskuntavastuu; Stora Enso; Kemijärvi

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lähteenmäki, T. (2017). Ympäristövastuun jäljillä : Stora Enso ja Kemijärven sellutehtaan lieteallaskeskustelu 2008-2017 . (Masters Thesis). Tampere University. Retrieved from https://trepo.tuni.fi/handle/10024/101206

Chicago Manual of Style (16^th Edition):

Lähteenmäki, Tuomas. “Ympäristövastuun jäljillä : Stora Enso ja Kemijärven sellutehtaan lieteallaskeskustelu 2008-2017 .” 2017. Masters Thesis, Tampere University. Accessed December 13, 2019. https://trepo.tuni.fi/handle/10024/101206.

MLA Handbook (7^th Edition):

Lähteenmäki, Tuomas. “Ympäristövastuun jäljillä : Stora Enso ja Kemijärven sellutehtaan lieteallaskeskustelu 2008-2017 .” 2017. Web. 13 Dec 2019.

Vancouver:

Lähteenmäki T. Ympäristövastuun jäljillä : Stora Enso ja Kemijärven sellutehtaan lieteallaskeskustelu 2008-2017 . [Internet] [Masters thesis]. Tampere University; 2017. [cited 2019 Dec 13]. Available from: https://trepo.tuni.fi/handle/10024/101206.

Council of Science Editors:

Lähteenmäki T. Ympäristövastuun jäljillä : Stora Enso ja Kemijärven sellutehtaan lieteallaskeskustelu 2008-2017 . [Masters Thesis]. Tampere University; 2017. Available from: https://trepo.tuni.fi/handle/10024/101206

University of Miami

10. Di Nezio, Pedro N. Mechanisms of Tropical Pacific Climate Change: Beyond the Bjerknes Feedback.

Degree: PhD, Meteorology and Physical Oceanography (Marine), 2011, University of Miami

URL: https://scholarlyrepository.miami.edu/oa_dissertations/567

► Mechanisms of tropical Pacific climate variability and change are studied in numerical experiments of future anthropogenic global warming (AGW), the Last Glacial Maximum (LGM)… (more)

▼ Mechanisms of tropical Pacific climate variability and change are studied in numerical experiments of future anthropogenic global warming (AGW), the Last Glacial Maximum (LGM) 21,000 years ago, and decadal variability (PDV). According to these mechanisms the equatorial Pacific does not become either El Niño- or La Niña-like as the tropics warm up in response to increasing greenhouse gases. Because humidity increases much faster than precipitation as the tropical atmosphere warms up, theory and models anticipate a slowing-down of the Walker circulation in order to keep a balanced flow of water vapor into areas of convection. On long time scales characteristic of climate change, ocean dynamics oppose these changes in the Walker circulation. First, equatorial adjustment theory indicates that changes in the Walker circulation are not amplified via the Bjerknes feedback, as during El Niño or La Niña events. Second, during AGW, the ocean becomes more thermally stratified resulting in enhanced cooling of the equatorial cold tongue opposing the warming there. These ideas can be applied to interpret proxies of the LGM for which El Niño and La Niña analogies have been made. However, the LGM tropics are not an opposite analogue to future AGW because the Walker circulation is also sensitive to changes in the geography of the Maritime continent associated with lower sea level. Models simulate a stronger Walker circulation when the tropics cool in order to compensate for the decrease in moisture due to a cooler/drier atmosphere. However, this response is opposed by a weakening of the ascending branch of the Walker circulation because convection is suppressed over vast areas of the Maritime Continent exposed due to lower sea level. In general, the patterns of warming or cooling for AGW and LGM are not El Niño- or La Niña-like because of the opposing mechanisms presented here. As such, adherence to an ENSO analogy for interpreting tropical Pacific climate change can lead to serious misconceptions. However, proxies of the thermocline tilt can provide unequivocal evidence of changes in the Walker circulation because the pressure gradient associated with the thermocline tilt has to be in balance with the trade winds at all timescales. Advisors/Committee Members: Amy Clement, Gabriel Vecchi, Brian Soden, Ben Kirtman, Sang-Ki Lee.

Subjects/Keywords: global warming; ENSO; tropical Pacific

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Di Nezio, P. N. (2011). Mechanisms of Tropical Pacific Climate Change: Beyond the Bjerknes Feedback. (Doctoral Dissertation). University of Miami. Retrieved from https://scholarlyrepository.miami.edu/oa_dissertations/567

Chicago Manual of Style (16^th Edition):

Di Nezio, Pedro N. “Mechanisms of Tropical Pacific Climate Change: Beyond the Bjerknes Feedback.” 2011. Doctoral Dissertation, University of Miami. Accessed December 13, 2019. https://scholarlyrepository.miami.edu/oa_dissertations/567.

MLA Handbook (7^th Edition):

Di Nezio, Pedro N. “Mechanisms of Tropical Pacific Climate Change: Beyond the Bjerknes Feedback.” 2011. Web. 13 Dec 2019.

Vancouver:

Di Nezio PN. Mechanisms of Tropical Pacific Climate Change: Beyond the Bjerknes Feedback. [Internet] [Doctoral dissertation]. University of Miami; 2011. [cited 2019 Dec 13]. Available from: https://scholarlyrepository.miami.edu/oa_dissertations/567.

Council of Science Editors:

Di Nezio PN. Mechanisms of Tropical Pacific Climate Change: Beyond the Bjerknes Feedback. [Doctoral Dissertation]. University of Miami; 2011. Available from: https://scholarlyrepository.miami.edu/oa_dissertations/567

University of Utah

11. Lareau, Neil P. Climatology of synoptic-scale ascent for Western North America: a perspective on storm tracks.

Degree: MS, Atmospheric Sciences, 2010, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/434/rec/464

► This study presents an ascent-based perspective on the climatology of storm tracks across western North America for the October-April cool seasons spanning 1989-2008. Data from… (more)

Subjects/Keywords: ENSO; Omega equation; Quasi-geostrophic; Storm tracks

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lareau, N. P. (2010). Climatology of synoptic-scale ascent for Western North America: a perspective on storm tracks. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/434/rec/464

Chicago Manual of Style (16^th Edition):

Lareau, Neil P. “Climatology of synoptic-scale ascent for Western North America: a perspective on storm tracks.” 2010. Masters Thesis, University of Utah. Accessed December 13, 2019. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/434/rec/464.

MLA Handbook (7^th Edition):

Lareau, Neil P. “Climatology of synoptic-scale ascent for Western North America: a perspective on storm tracks.” 2010. Web. 13 Dec 2019.

Vancouver:

Lareau NP. Climatology of synoptic-scale ascent for Western North America: a perspective on storm tracks. [Internet] [Masters thesis]. University of Utah; 2010. [cited 2019 Dec 13]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/434/rec/464.

Council of Science Editors:

Lareau NP. Climatology of synoptic-scale ascent for Western North America: a perspective on storm tracks. [Masters Thesis]. University of Utah; 2010. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/434/rec/464

Texas A&M University

12. Yang, Chunxue 1984-. The long-term change of El Ni?o Southern Oscillation in an ensemble reanalysis and climate coupled models.

Degree: 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/148283

► Long-term changes of El Ni?o/Southern Oscillation (ENSO) are studied with the ensemble run of Simple Ocean Data Assimilation (SODA 2.2.6) and the Coupled Model Intercomparison… (more)

▼ Long-term changes of El Ni?o/Southern Oscillation (ENSO) are studied with the ensemble run of Simple Ocean Data Assimilation (SODA 2.2.6) and the Coupled Model Intercomparison Project Phase 5 (CMIP5). An eight member ocean reanalyses (SODA 2.2.6) from 1871 to 2008 is produced by using forcing from eight ensemble members of an atmospheric reanalysis. The ensemble reanalysis shows that El Ni?o has prominent decadal variability. Weak El Ni?os occur throughout the entire record whereas the occurrence of strong El Ni?os varies, with strong El Ni?o at the beginning and end of the record. The strength of La Ni?a is weaker than for El Ni?o, and has less variability. Although for any given El Ni?o year all ensemble members show the occurrence of El Ni?o, in some ensemble members the El Ni?o is strong while in others it is weak. When the timing of the onset of Westerly Wind Bursts (WWBs) occurs earlier in the year and the strength of WWBs is stronger, strong El Ni?o occurs. To study the importance of the background state in the tropical Pacific Ocean on ENSO, long-term trends of tropical Pacific SST, wind stress, subsurface temperature and the sub-tropical cells (STCs) are analyzed. The reanalysis shows that there is a slight cooling trend of SST in the central tropical Pacific due to an enhanced tropical Pacific circulation. Subsurface temperature also has a cooling trend. The STCs, which consist of equatorial upwelling, Ekman transport, extra-tropical subduction and pycnocline transport from the sub-tropical to the tropical region, strengthen from 1900 to 2008. When the STCs are accelerated, equatorial upwelling increases bringing cold water from the subsurface that cools the surface. ENSO variability is also analyzed in the CMIP5 historical experiments. Results show that most of the models have a realistic representation of the strength of ENSO; however, the location of warming generally extends too far to the west. Overall, properties of ENSO do not show a significant change in most of the CMIP5 models. One distinguishing difference between the CMIP5 models and SODA 2.2.6 is that ENSO in SODA 2.2.6 has prominent asymmetry between El Ni?o and La Ni?a, whereas ENSO in the CMIP5 models tends to have fairly symmetric El Ni?o and La Ni?a. In contrast with the reanalysis most of the CMIP5 models have warming trends at the surface and the transport of the STCs has a decreasing trend. Advisors/Committee Members: Giese, Benjamin (advisor), Wu, Lixin (advisor), Chang, Ping (committee member), Schumacher, Courtney (committee member).

Subjects/Keywords: long-term change; CMIP5; SODA; ENSO

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Yang, C. 1. (2012). The long-term change of El Ni?o Southern Oscillation in an ensemble reanalysis and climate coupled models. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148283

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):

Yang, Chunxue 1984-. “The long-term change of El Ni?o Southern Oscillation in an ensemble reanalysis and climate coupled models.” 2012. Thesis, Texas A&M University. Accessed December 13, 2019. http://hdl.handle.net/1969.1/148283.

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

MLA Handbook (7^th Edition):

Yang, Chunxue 1984-. “The long-term change of El Ni?o Southern Oscillation in an ensemble reanalysis and climate coupled models.” 2012. Web. 13 Dec 2019.

Vancouver:

Yang C1. The long-term change of El Ni?o Southern Oscillation in an ensemble reanalysis and climate coupled models. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/1969.1/148283.

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

Council of Science Editors:

Yang C1. The long-term change of El Ni?o Southern Oscillation in an ensemble reanalysis and climate coupled models. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148283

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

Universidade do Rio Grande do Sul

13. Rodrigues, Bruno Dias. Comportamento dos sistemas frontais no estado do Rio Grande do Sul durante os episódios ENOS.

Degree: 2015, Universidade do Rio Grande do Sul

URL: http://hdl.handle.net/10183/139305

►

Este estudo teve por finalidade investigar a frequência e intensidade dos Sistemas Frontais (SF) avaliando-os com os episódios ENOS (El Niño Oscilação Sul) para o… (more)

▼

Este estudo teve por finalidade investigar a frequência e intensidade dos Sistemas Frontais (SF) avaliando-os com os episódios ENOS (El Niño Oscilação Sul) para o período da Primavera (SON) de 2000 a 2010 sobre o Estado do Rio Grande do Sul (RS). As análises mostraram que os anos em que se tem a menor ocorrência de SF estão associados principalmente a eventos de La Niña Fraco e Neutralidade. Em contrapartida, um número maior de Sistemas Frontais foi verificado com relação aos episódios de El Niño Moderado e Neutralidade. Especificamente, no que se refere à questão mensal, percebeu-se que no mês de Outubro há uma maior influência dos Sistemas Frontais do que em Setembro e Novembro. Outro fator pertinente e evidenciado deu-se pelas comparações entre o período escolhido (no qual não ocorreram eventos fortes) e os episódios de ENOS Fortes. Notou-se, neste caso, que não ocorreram variações impactantes no número de Sistemas Frontais, embora se tenha o conhecimento dos efeitos e alterações existentes nos padrões de circulação atmosférica devido à atuação dos fenômenos de escala interanual. Ainda, tendo a necessidade de ampliar a gama de entendimento, foi realizada uma abordagem com relação ao comportamento da precipitação em seis sub-regiões do Estado, onde se observou de forma geral, um aumento da precipitação em praticamente todas as áreas do RS, quando comparado com a média Histórica. Com isso, ressaltou-se que os volumes mensais abaixo da média Histórica estão ligados a episódios de Neutralidade. Já a normalidade do regime de precipitação, mostrou-se interligado em média para todas as regiões ao evento de El Niño e por último, as precipitações acima da normal climatológica estão mais presentes em condições de El Niño, mais especificamente de intensidade Moderada. Dentre as sub-regiões analisadas, destacou-se a parte Oeste do Estado por ter apresentado uma maior intensidade nos volumes de precipitação. Outro fator importante analisado foram os valores percentuais das precipitações derivadas dos sistemas frontais. Levando-se em conta a média das avaliações, verificou-se que as sub-regiões Sul e Sudoeste do Rio Grande do Sul são as mais influenciadas pelas passagens dos Sistemas Frontais, enquanto os menores impactos na precipitação podem ser notados nas regiões Central e Norte do Rio Grande do Sul. Além disso, realizou-se um estudo de caso para avaliar o comportamento dos Sistemas Frontais em episódios de ENOS diferentes, nos campos de pressão atmosférica e temperatura do ar. Logo, averigou-se que em um ano de Neutralidade, as passagens de SF sobre o Estado costumam ser mais prolongadas em sua duração de tempo, permanecendo mais dias, com algumas variações significativas nos campos meteorológicos observados. Enquanto para um ano referente à condição de El Niño Moderado, os Sistemas Frontais possuem, na maioria dos casos, uma duração de tempo menor, consequentemente com menores variações na temperatura e pressão.

This study aimed to investigate the frequency and intensity of the frontal systems (FS) evaluating them…

Advisors/Committee Members: Alves, Rita de Cássia Marques.

Subjects/Keywords: Sensoriamento remoto; ENSO; Frontal system; Precipitation

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Rodrigues, B. D. (2015). Comportamento dos sistemas frontais no estado do Rio Grande do Sul durante os episódios ENOS. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/139305

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):

Rodrigues, Bruno Dias. “Comportamento dos sistemas frontais no estado do Rio Grande do Sul durante os episódios ENOS.” 2015. Thesis, Universidade do Rio Grande do Sul. Accessed December 13, 2019. http://hdl.handle.net/10183/139305.

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

MLA Handbook (7^th Edition):

Rodrigues, Bruno Dias. “Comportamento dos sistemas frontais no estado do Rio Grande do Sul durante os episódios ENOS.” 2015. Web. 13 Dec 2019.

Vancouver:

Rodrigues BD. Comportamento dos sistemas frontais no estado do Rio Grande do Sul durante os episódios ENOS. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2015. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/10183/139305.

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

Council of Science Editors:

Rodrigues BD. Comportamento dos sistemas frontais no estado do Rio Grande do Sul durante os episódios ENOS. [Thesis]. Universidade do Rio Grande do Sul; 2015. Available from: http://hdl.handle.net/10183/139305

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

University of Southern California

14. Zhu, Mengfan. Recent variability in the hyrdological cycle of tropical Asia from oxygen isotopes of tree celulose.

Degree: PhD, Geological Sciences, 2012, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/65436/rec/5436

► This dissertation investigates hydrological variability within tropical Asia over the past several few centuries as reflected in the stable oxygen isotope composition of atmospheric moisture.… (more)

▼ This dissertation investigates hydrological variability within tropical Asia over the past several few centuries as reflected in the stable oxygen isotope composition of atmospheric moisture. The stable isotopes of water in the climate system are unique tracers of moisture transport and tropical rainfall variability. The isotopic signal of atmospheric moisture within the tropics is transferred to cellulose of tropical trees during photosynthesis. Thus, the isotopic composition of tree cellulose can provide an archive of past hydrologic variability through isotopic reconstructions of the cellulose extracted from annual rings of long lived trees. The tropical atmospheric variability reflected in tropical trees can include variations in the Indian Monsoon and changes in moisture availability over Asia in response to the El Niño-Southern Oscillation (ENSO). Here an attempt has been made to better understand how the atmospheric dynamics associated within these climate phenomena influence the isotopic composition of tree cellulose and how these climate signatures have changed through time. High-resolution water isotope records are developed from trees collected from northern Thailand, southern Cambodia, and eastern part of the Tibetan Plateau. These records are examined to assess whether and how the 20th century is unique in terms of the hydrological conditions in tropical Asia under the influences of both monsoon and ENSO with the observed temperature changes. ❧ In northern Thailand, the oxygen isotopic composition (δ¹⁸O) of tree cellulose samples of Pinus kesiya from a montane forest has been analyzed in subannual resolution for the past 80 years. The cellulose δ¹⁸O values exhibit a distinctive annual cycle with an amplitude of up to 12‰, which is interpreted to reflect primarily the seasonal cycle of precipitation δ¹⁸O. The cellulose δ¹⁸O annual mean values correlate significantly with the amount of summer monsoon precipitation over the India subcontinent, corroborating recent studies that suggest the so-called “isotope amount effect” in the tropical precipitation δ¹⁸O reflects the hydrological processes of the upstream or the moisture source regions instead of the rainfall amount at the local site. No obvious trend in the summer monsoon precipitation is detected from the cellulose δ¹⁸O record. However, the record does suggest a temporal weakening relationship between the Indian Monsoon and ENSO over the 20th century. The annual maxima in the cellulose δ¹⁸O values are representative of the moisture balance during the winter dry season, and possibly document a decreasing trend in the isotopically-distinct fog water input during the dry season because of the warming in the 20th century. ❧ Isotope chronologies of Pinus merkusii from a coastal lowland forest in Cambodia have been generated to investigate hydrological variability over the Indo-Pacific Warm Pool (IPWP), based on the aforementioned observation that the δ¹⁸O in precipitation reflects the hydroclimate of the moisture source region. The IPWP is a major source of… Advisors/Committee Members: Stott, Lowell (Committee Chair), Emile-Geay, Julien (Committee Member), Feakins, Sarah J. (Committee Member), Wilson, John P. (Committee Member).

Subjects/Keywords: δ 18O; ENSO; monsoon; tree cellulose

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Zhu, M. (2012). Recent variability in the hyrdological cycle of tropical Asia from oxygen isotopes of tree celulose. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/65436/rec/5436

Chicago Manual of Style (16^th Edition):

Zhu, Mengfan. “Recent variability in the hyrdological cycle of tropical Asia from oxygen isotopes of tree celulose.” 2012. Doctoral Dissertation, University of Southern California. Accessed December 13, 2019. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/65436/rec/5436.

MLA Handbook (7^th Edition):

Zhu, Mengfan. “Recent variability in the hyrdological cycle of tropical Asia from oxygen isotopes of tree celulose.” 2012. Web. 13 Dec 2019.

Vancouver:

Zhu M. Recent variability in the hyrdological cycle of tropical Asia from oxygen isotopes of tree celulose. [Internet] [Doctoral dissertation]. University of Southern California; 2012. [cited 2019 Dec 13]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/65436/rec/5436.

Council of Science Editors:

Zhu M. Recent variability in the hyrdological cycle of tropical Asia from oxygen isotopes of tree celulose. [Doctoral Dissertation]. University of Southern California; 2012. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/65436/rec/5436

Kansas State University

15. Leiva Lanza, Paul. Peruvian fishmeal industry resilience to El Niño Southern Oscillation (ENSO) events: implications for industry structure.

Degree: MS, Department of Agricultural Economics, 2018, Kansas State University

URL: http://hdl.handle.net/2097/38916

► With the recent increase in record-breaking weather events and the inherent susceptibility of the fishmeal industry to temperature fluctuations, the industry dynamics and sustainability of… (more)

▼ With the recent increase in record-breaking weather events and the inherent susceptibility of the fishmeal industry to temperature fluctuations, the industry dynamics and sustainability of the Peruvian fishmeal sector has gained renewed attention. Among important causes of concern are the cyclical impact of El Niño Southern Oscillation (ENSO) events on productivity and profitability of fishmeal producing firms, long-term structural changes in the industry, and resulting socio-economic consequences. Although distinct risk management strategies have been implemented by industry players and a range of policy initiatives have been introduced by the government over the years, the firms in the Peruvian fishmeal industry remain highly susceptible to the effects of ENSO events. The increased frequency and magnitude of ENSO events over the past decade has forced relatively less resilient firms out of business and has been accompanied by an observable trend towards increased industry concentration. While there is a potential for efficiency gains and economies of scale from increased concentration, policy makers and industry players have concerns about negative social implications from declining numbers of small and medium firms and shifting competitive dynamics in the industry. As a result, policy-makers and industry stakeholders are in the continuous search for effective strategies and mechanisms for enhancing the resilience of individual fishmeal producers and the overall industry to the effects of ENSO events. The objective of this study is to expand the understanding of factors that affect the resilience of firms to ENSO events in the Peruvian fishmeal industry. The analysis is based on a panel database that combines information from the Peruvian Instituto Nacional de Estadística e Informática (Statistics Institute), Aduanet (Peruvian Customs website), and the Oceanic Niño Index (ONI). The objective is to identify firm characteristics and factors that can potentially enhance the resilience of a firm to the negative impacts of ENSO events. The specific period of study covers the ENSO event that lasted from July 2009 to April 2010. The resilience of individual firms is measured by applying system resilience framework proposed by Barroso et al. (2015). Subsequently, the effect of a range of characteristics on firm resilience is estimated using a fractional response logit method. Among key parameters of interest are the estimated effects of size, experience, location, and participation in government support programs. The results indicate positive relationship between resilience and experience, diversification, access to government subsidy programs, and share of imported inputs. The results also indicate a negative effect of firm size on resilience to ENSO events. The industry and policy implications of the findings are discussed, while highlighting the number of methodological limitations. The overall contribution of this study is twofold. First it presents an application of resilience triangle approach to measuring firm… Advisors/Committee Members: Aleksan Shanoyan.

Subjects/Keywords: Fishmeal; ENSO; Industry structure; Resilience Framework; Peru

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Leiva Lanza, P. (2018). Peruvian fishmeal industry resilience to El Niño Southern Oscillation (ENSO) events: implications for industry structure. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/38916

Chicago Manual of Style (16^th Edition):

Leiva Lanza, Paul. “Peruvian fishmeal industry resilience to El Niño Southern Oscillation (ENSO) events: implications for industry structure.” 2018. Masters Thesis, Kansas State University. Accessed December 13, 2019. http://hdl.handle.net/2097/38916.

MLA Handbook (7^th Edition):

Leiva Lanza, Paul. “Peruvian fishmeal industry resilience to El Niño Southern Oscillation (ENSO) events: implications for industry structure.” 2018. Web. 13 Dec 2019.

Vancouver:

Leiva Lanza P. Peruvian fishmeal industry resilience to El Niño Southern Oscillation (ENSO) events: implications for industry structure. [Internet] [Masters thesis]. Kansas State University; 2018. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/2097/38916.

Council of Science Editors:

Leiva Lanza P. Peruvian fishmeal industry resilience to El Niño Southern Oscillation (ENSO) events: implications for industry structure. [Masters Thesis]. Kansas State University; 2018. Available from: http://hdl.handle.net/2097/38916

16. Henke, Lilo Maria Keti. Long term hydrological change, the El Niño/Southern Oscillation and biomass burning in the tropics.

Degree: PhD, 2016, University of Exeter

URL: http://hdl.handle.net/10871/27975

► Rapidly rising levels of atmospheric greenhouse gases including carbon dioxide and methane since the industrial revolution have drawn scientific attention to the importance of the… (more)

▼ Rapidly rising levels of atmospheric greenhouse gases including carbon dioxide and methane since the industrial revolution have drawn scientific attention to the importance of the global carbon cycle to the climate (Cubasch et al., 2013). Tropical peatlands, the majority of which are located in the Indonesian region, are a major source of uncertainty in the carbon cycle as the relationships between carbon accumulation and hydrological changes remain poorly understood (Hergoualc’h & Verchot, 2011, Page et al., 2011). An important driver of carbon emissions in tropical peatlands is fire, which in the Indonesian region is strongly influenced on interannual timescales by the El Niño/Southern Oscillation (ENSO). However, it is not clear how ENSO and fire have varied at decadal to centennial scales over the past two millennia. This thesis explores long term tropical hydrological variability and ENSO-like climate change from palaeorecords and their interactions with fire. Using a wide range of instrumental, proxy and model datasets and a novel reconstruction method, two separate reconstructions of long-term ENSO-like climate change are produced based on precipitation and temperature data. These show no evidence of a difference between the ENSO-like behaviour of precipitation and temperature. There is limited evidence for a difference in long-term ENSO-like state between the Medieval Climate Anomaly and the Little Ice Age. Reconstructions of hydrological variability and biomass burning in the Indonesian region suggest that precipitation and fire have been positively correlated over the past 2,000 years, which is contrary to the modern-day relationship on ENSO timescales. This throws up questions of long-term versus short-term interactions and feedbacks between fire, climate and vegetation. It is likely that anthropogenic activity in the Indonesian region has significantly altered the stability of the fire regime. Further research combining proxy data, climate and fire models, and using more robust statistical analysis is necessary to untangle the natural and anthropogenic driving factors at different time resolutions.

Subjects/Keywords: 551.6; ENSO; palaeoclimatology; biomass burning; proxy reconstructions

11 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Henke, L. M. K. (2016). Long term hydrological change, the El Niño/Southern Oscillation and biomass burning in the tropics. (Doctoral Dissertation). University of Exeter. Retrieved from http://hdl.handle.net/10871/27975

Chicago Manual of Style (16^th Edition):

Henke, Lilo Maria Keti. “Long term hydrological change, the El Niño/Southern Oscillation and biomass burning in the tropics.” 2016. Doctoral Dissertation, University of Exeter. Accessed December 13, 2019. http://hdl.handle.net/10871/27975.

MLA Handbook (7^th Edition):

Henke, Lilo Maria Keti. “Long term hydrological change, the El Niño/Southern Oscillation and biomass burning in the tropics.” 2016. Web. 13 Dec 2019.

Vancouver:

Henke LMK. Long term hydrological change, the El Niño/Southern Oscillation and biomass burning in the tropics. [Internet] [Doctoral dissertation]. University of Exeter; 2016. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/10871/27975.

Council of Science Editors:

Henke LMK. Long term hydrological change, the El Niño/Southern Oscillation and biomass burning in the tropics. [Doctoral Dissertation]. University of Exeter; 2016. Available from: http://hdl.handle.net/10871/27975

George Mason University

17. Yu, Chunguang. Methodologies for Seasonal Adjustment in ENSO Studies .

Degree: 2010, George Mason University

URL: http://hdl.handle.net/1920/6012

► The El Niño/Southern Oscillation (ENSO) represents the most important natural part of global climate variability. The Southern Oscillation Index (SOI) and the Niño Regional Sea… (more)

Subjects/Keywords: seasonal adjustment; ENSO; SST; climatology; STL; statistics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Yu, C. (2010). Methodologies for Seasonal Adjustment in ENSO Studies . (Thesis). George Mason University. Retrieved from http://hdl.handle.net/1920/6012

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):

Yu, Chunguang. “Methodologies for Seasonal Adjustment in ENSO Studies .” 2010. Thesis, George Mason University. Accessed December 13, 2019. http://hdl.handle.net/1920/6012.

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

MLA Handbook (7^th Edition):

Yu, Chunguang. “Methodologies for Seasonal Adjustment in ENSO Studies .” 2010. Web. 13 Dec 2019.

Vancouver:

Yu C. Methodologies for Seasonal Adjustment in ENSO Studies . [Internet] [Thesis]. George Mason University; 2010. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/1920/6012.

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

Council of Science Editors:

Yu C. Methodologies for Seasonal Adjustment in ENSO Studies . [Thesis]. George Mason University; 2010. Available from: http://hdl.handle.net/1920/6012

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

Victoria University of Wellington

18. Emanuelsson, Daniel. High-Resolution Water Stable Isotope Ice-Core Record: Roosevelt Island, Antarctica.

Degree: 2016, Victoria University of Wellington

URL: http://hdl.handle.net/10063/6699

► This thesis presents a water-isotope (δD) record from 1900 to 2009 for the Roosevelt Island Climate Evolution (RICE) ice core, Antarctica. Examination of the RICE… (more)

▼ This thesis presents a water-isotope (δD) record from 1900 to 2009 for the Roosevelt Island Climate Evolution (RICE) ice core, Antarctica. Examination of the RICE isotope record with observation data (using global reanalysis and SST datasets) revealed details of the climate signal that is preserved within the full 763 m isotope record. RICE δD provides a proxy record, which captures the central tropical Pacific ENSO variability, the significant (p < 0.01) central Pacific δD-SST correlation pattern contain the Niño-4 SST region. Central tropical Pacific ENSO variability projects upon the Amundsen Sea region via a Pacific–South American pattern (PSA)-like teleconnection. RICE δD is primarily influenced by Amundsen Sea circulation, which coincides with the leading PSA pattern’s (PSA1) circulation focal point in the Amundsen Sea. Additionally, RICE regional physical setting (sheltered from direct impact from Amundsen Sea cyclones by WA orography) offers a unique setting, where enriched isotopes only are associated with one PSA1 polarity (El Niño, PSA1+, Amundsen Sea anticyclones). In contrast, during La Niña and Amundsen Sea cyclones, δD is depleted. Combined these settings, provides a compelling explanation to why RICE δD preserves PSA1 and ENSO variability. On interannual and seasonal time scales, the RICE δD variability is well-explained by the PSA teleconnections and their interactions over the Pacific sector. The influence from PSA2 on δD is strong during the beginning of the year (December–February, DJF). In contrast, the PSA1 influence is strong during the latter part of the year, peaking in spring (September–November, SON). The isotope record appears to preserve tropical Pacific El Niño-like interdecadal variability, particularly a decadal-signal from the central-Pacific (Niño-4 SST region) and from the Pacific-wide Interdecadal Pacific Oscillation (IPO). On decadal-scales RICE δD is modulated by ENSO and Southern Annular Mode (SAM); when the correlation with SAM is active (during IPO+) δD appears to be in a depleted state and when the correlation with SAM breaks down (during IPO−) δD appears to be in a relatively enriched state. A RICE δD SST proxy reconstruction can potentially provide a record longer than the currently available observational datasets, allowing for examination of intrinsic decadal-scale tropical Pacific climate variability and its extratropical impact. Advisors/Committee Members: Bertler, Nancy, Baisden, Troy, Renwick, James.

Subjects/Keywords: Water stable isotopes; ENSO variability; ice cores

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Emanuelsson, D. (2016). High-Resolution Water Stable Isotope Ice-Core Record: Roosevelt Island, Antarctica. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/6699

Chicago Manual of Style (16^th Edition):

Emanuelsson, Daniel. “High-Resolution Water Stable Isotope Ice-Core Record: Roosevelt Island, Antarctica.” 2016. Doctoral Dissertation, Victoria University of Wellington. Accessed December 13, 2019. http://hdl.handle.net/10063/6699.

MLA Handbook (7^th Edition):

Emanuelsson, Daniel. “High-Resolution Water Stable Isotope Ice-Core Record: Roosevelt Island, Antarctica.” 2016. Web. 13 Dec 2019.

Vancouver:

Emanuelsson D. High-Resolution Water Stable Isotope Ice-Core Record: Roosevelt Island, Antarctica. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2016. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/10063/6699.

Council of Science Editors:

Emanuelsson D. High-Resolution Water Stable Isotope Ice-Core Record: Roosevelt Island, Antarctica. [Doctoral Dissertation]. Victoria University of Wellington; 2016. Available from: http://hdl.handle.net/10063/6699

University of New South Wales

19. Meng, Zhaosu. Impact of El Niño‐Southern Oscillation on Rice Production in China.

Degree: Physical, 2012, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/52235 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10905/SOURCE01?view=true

► El Niño-Southern Oscillation (ENSO) is the strongest interannual source of variabilityleading to anomalous climatic conditions. This thesis examines how important it is ininfluencing agricultural production… (more)

▼ El Niño-Southern Oscillation (ENSO) is the strongest interannual source of variabilityleading to anomalous climatic conditions. This thesis examines how important it is ininfluencing agricultural production of rice. Statistical methods are used to analyze therelationship between ENSO, characterized by the Niño 3 index, and the component ofrice production that depends on interannual climate variability (climate production).This only accounts for a small part of total production but, if the prediction of riceproduction is even fractionally improved by the inclusion of the effects of ENSO, largebenefits could result.Climate production is extracted from total rice production by removing long-termtrends and by the use of Savitisky-Golay smoothing functions. Econometric regressionmodels for rice production including the Niño 3 index are constructed for tworepresentative rice-growing provinces in China.It was found that, in northeastern China, ENSO is likely to lead to more precipitationin spring and to a lesser extent in summer, in the year during which El Niño isdeveloping.In southern China, ENSO is likely to lead to more precipitation in the summer andautumn following an ENSO event, with the greatest effect on late-season rice. Airtemperature shows a stronger correlation with ENSO than precipitation and in the sameperiod, but is less likely to affect rice production.In northeastern China, a large fluctuation in climate production in a year followingan ENSO peak is usually accompanied by a large variation in precipitation.In southern China, climate production of late-season rice and precipitation arepositively correlated. Again, a large fluctuation in climate production in a yearfollowing ENSO peak is usually accompanied by large variation in precipitation and airtemperature in the summer.The regression model for rice production in northeastern China is better than that forsouthern China, where local climate and other factors are relatively more important. The consumption of fertilizer is the most important factor in rice production in northernChina, electricity consumption the most important factor in southern China. Advisors/Committee Members: Lees, Brian, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW.

Subjects/Keywords: econometric model; rice production; ENSO; economic impacts

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Meng, Z. (2012). Impact of El Niño‐Southern Oscillation on Rice Production in China. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/52235 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10905/SOURCE01?view=true

Chicago Manual of Style (16^th Edition):

Meng, Zhaosu. “Impact of El Niño‐Southern Oscillation on Rice Production in China.” 2012. Doctoral Dissertation, University of New South Wales. Accessed December 13, 2019. http://handle.unsw.edu.au/1959.4/52235 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10905/SOURCE01?view=true.

MLA Handbook (7^th Edition):

Meng, Zhaosu. “Impact of El Niño‐Southern Oscillation on Rice Production in China.” 2012. Web. 13 Dec 2019.

Vancouver:

Meng Z. Impact of El Niño‐Southern Oscillation on Rice Production in China. [Internet] [Doctoral dissertation]. University of New South Wales; 2012. [cited 2019 Dec 13]. Available from: http://handle.unsw.edu.au/1959.4/52235 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10905/SOURCE01?view=true.

Council of Science Editors:

Meng Z. Impact of El Niño‐Southern Oscillation on Rice Production in China. [Doctoral Dissertation]. University of New South Wales; 2012. Available from: http://handle.unsw.edu.au/1959.4/52235 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10905/SOURCE01?view=true

University of Illinois – Urbana-Champaign

20. Huang, Andrew K. Analyzing el nino southern oscillation predictions from long-short-merm-memory models.

Degree: MS, Atmospheric Sciences, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/101011

► El Nino Southern Oscillation (ENSO) can have global impacts across the world. Because of its prevalence, scientists run models to forecast its next move. Here,… (more)

Subjects/Keywords: ENSO; LSTM; LR; modeling; deep learning; forecast

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Huang, A. K. (2018). Analyzing el nino southern oscillation predictions from long-short-merm-memory models. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/101011

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):

Huang, Andrew K. “Analyzing el nino southern oscillation predictions from long-short-merm-memory models.” 2018. Thesis, University of Illinois – Urbana-Champaign. Accessed December 13, 2019. http://hdl.handle.net/2142/101011.

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

MLA Handbook (7^th Edition):

Huang, Andrew K. “Analyzing el nino southern oscillation predictions from long-short-merm-memory models.” 2018. Web. 13 Dec 2019.

Vancouver:

Huang AK. Analyzing el nino southern oscillation predictions from long-short-merm-memory models. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2018. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/2142/101011.

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

Council of Science Editors:

Huang AK. Analyzing el nino southern oscillation predictions from long-short-merm-memory models. [Thesis]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/101011

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

University of New South Wales

21. Roe, Jessica. High-resolution climate reconstruction for the last 3000 years from lake sediments in tropical Queensland.

Degree: Biological, Earth & Environmental Sciences, 2015, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/54705 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35608/SOURCE02?view=true

► Reconstructing past climate change is critical for understanding future variability. Unfortunately, instrumental records are relatively short, with the longest known record in Australia existing from… (more)

▼ Reconstructing past climate change is critical for understanding future variability. Unfortunately, instrumental records are relatively short, with the longest known record in Australia existing from the late 19th Century. Records on such a narrow timescale limit our understanding of natural variability, and inhibit the detection of rare or extreme events on different timescales. Climate proxies provide an opportunity to extend instrumental records over millennia. The use of proxies such as ice-cores, tree-rings, lake and ocean sediments, have revealed important climate variability during the past 3000 years, particularly in the Northern Hemisphere; these studies have identified multi-centennial events such as the Medieval Climate Anomaly (approximately AD 800-1250) and the Little Ice Age (approximately AD 1350-1850). In the Southern Hemisphere, however, our understanding of climate over this period is considerably less well known; with a particular dearth of records in the tropics. This study provides new, high-resolution climate proxy data on the climate of the Atherton Tableland region of tropical northern Queensland during the last 3000 years. A dearth of climate proxy data exists from the global tropics, limiting our understanding of climate dynamics. Dominated by ocean cover, the tropics serve as a significant global heat reservoir and play a major role in global atmospheric circulation. The West-Pacific Warm Pool (WPWP) is the largest of these heat reservoirs stretching from the eastern Indian Ocean through to the western portion of the equatorial Pacific and including the tropical waters off the north-east coast of Queensland. The Atherton Tableland is ideally placed to reconstruct changes of the past 3000 years, located at the junction of several major climatic and oceanic boundaries including the WPWP the region is influenced by the Inter-Tropical Convergence Zone (ITCZ), the El Niño Southern Oscillation (ENSO) and the Australian-Indonesian Summer Monsoon (AISM). In the remnant tropical forests of the Atherton Tablelands, volcanic crater lakes contain sediments deposited over thousands of years; offering the potential of high-resolution palaeoclimate analysis of the last 3000 years. In this study, proxy data was obtained from cores extracted from two extinct volcanic craters; Quincan Crater and Bromfield Swamp. Humification, geochemical analysis (ITRAX), carbon:nitrogen ratio, charcoal and pollen analysis were undertaken at a fine resolution, with the ITRAX (XRF) core scanner providing sub-annually resolved data. The multi-proxy analysis was undertaken within a robust geochronological framework using comprehensive AMS radiocarbon (14C) dating. At Quincan Crater sediment accumulated at a rate of 1 cm per 6.8 years on average, and was found to be three times more rapid than that of Bromfield Swamp. This research revealed two distinct climatic periods operating over the last 3000 years. From 3000 – 1700 Y BP, ENSO appears to be the dominant climate mode, with strong ENSO periodicities expressed across… Advisors/Committee Members: Turney, Chris, Climate Change Research Centre (CCRC), Faculty of Science, UNSW, Mooney, Scott, Biological, Earth & Environmental Sciences, Faculty of Science, UNSW, Haberle, Simon, ANU, Kershaw, Peter, Monash.

Subjects/Keywords: ITCZ; Palaeoclimate; Lake sediments; ENSO; ITRAX

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Roe, J. (2015). High-resolution climate reconstruction for the last 3000 years from lake sediments in tropical Queensland. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/54705 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35608/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Roe, Jessica. “High-resolution climate reconstruction for the last 3000 years from lake sediments in tropical Queensland.” 2015. Doctoral Dissertation, University of New South Wales. Accessed December 13, 2019. http://handle.unsw.edu.au/1959.4/54705 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35608/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Roe, Jessica. “High-resolution climate reconstruction for the last 3000 years from lake sediments in tropical Queensland.” 2015. Web. 13 Dec 2019.

Vancouver:

Roe J. High-resolution climate reconstruction for the last 3000 years from lake sediments in tropical Queensland. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2019 Dec 13]. Available from: http://handle.unsw.edu.au/1959.4/54705 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35608/SOURCE02?view=true.

Council of Science Editors:

Roe J. High-resolution climate reconstruction for the last 3000 years from lake sediments in tropical Queensland. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/54705 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35608/SOURCE02?view=true

University of Miami

22. Lu, Xing. South Pacific Tropical Water: Variability and Downstream Impacts.

Degree: PhD, Meteorology and Physical Oceanography (Marine), 2019, University of Miami

URL: https://scholarlyrepository.miami.edu/oa_dissertations/2308

► As salinity and temperature of South Pacific Tropical Water (SPTW) increased due to climate change, there is interest in its variability and downstream impacts on… (more)

▼ As salinity and temperature of South Pacific Tropical Water (SPTW) increased due to climate change, there is interest in its variability and downstream impacts on the equatorial region. SPTW was characterized by a vertical salinity maximum 35.6-36.5 psu located at 8°S-25°S, 160°W-110°W and lying in the upper thermocline between 24 and 25 σθ. This dissertation examines variability in SPTW that were affected by different forcing mechanisms, and the downstream impacts of this variability on circulation as these waters moved equatorward. Kinematic method and tracer method for calculating subduction rates, complex empirical orthogonal function (CEOF) analysis for mapping spiciness anomalies and propagation patterns were used. Argo, hydrographic and tracers were the main data. The output from the Community Climate System Model 4 (CCSM4) was compared to observations and was used to examine coupled air-sea processes. The Connectivity Modeling System (CMS) was used to track SPTW anomalies and the results were used to examine downstream equatorial impacts. This dissertation finds new connections between the downstream impacts of variability in SPTW and the atmosphere over the equatorial region. First, SPTW annual subduction rates were calculated using two methods, and their variability at interannual and potentially longer time scales was examined. The kinematic method used monthly averaged data from the Argo product, 2005 to 2018. The SPTW annual subduction rates over this period averaged 25 m yr-1 and varied from 14 to 47 m yr-1. Furthermore, subduction and lateral induction rates were negatively correlated with the Nino 3.4 index. The tracer method using chlorofluorocarbon (CFC-12) data from the 1990s generated an average subduction rate of 35 5 m yr-1 over the same SPTW volume as that estimated from the kinematic method. Differences between the two methods and variability in vertical pumping may explain the differences in SPTW subduction rates between the two decades. After subduction, SPTW was transported westward by the South Equatorial Current (SEC). The SEC exhibited two three-year cycles and one four-year cycle, with each cycle containing an El Niño-Southern Oscillation event. Rossby waves played an essential role in these cycles as well as in the westward extension of the SPTW. These results suggested that variability in SPTW subduction rates and hydrographic properties, which was transported westward by the SEC, has the potential to influence the downstream circulation in the tropical Pacific. Second, temperature (T) and salinity (S) anomalies were shown for the first time to alter density downstream, which provided a mechanism for affecting the equatorial circulation. Two T/S anomalies, with respect to the Argo period mean 2005 to 2014, originated in SPTW from about 20°S, 120°W at 24 - 25σθ isopycnals. T anomalies had a stronger influence on density anomalies than S anomalies. Warm/salty anomalies were produced during El Niño phases and cold/fresh anomalies were produced during La Niña phases. Buoyancy changes… Advisors/Committee Members: Rana A. Fine, Igor Kamenkovich, Mohamed Iskandarani, Benjamin Kirtman.

Subjects/Keywords: Argo; South Pacific Tropical Water; ENSO

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lu, X. (2019). South Pacific Tropical Water: Variability and Downstream Impacts. (Doctoral Dissertation). University of Miami. Retrieved from https://scholarlyrepository.miami.edu/oa_dissertations/2308

Chicago Manual of Style (16^th Edition):

Lu, Xing. “South Pacific Tropical Water: Variability and Downstream Impacts.” 2019. Doctoral Dissertation, University of Miami. Accessed December 13, 2019. https://scholarlyrepository.miami.edu/oa_dissertations/2308.

MLA Handbook (7^th Edition):

Lu, Xing. “South Pacific Tropical Water: Variability and Downstream Impacts.” 2019. Web. 13 Dec 2019.

Vancouver:

Lu X. South Pacific Tropical Water: Variability and Downstream Impacts. [Internet] [Doctoral dissertation]. University of Miami; 2019. [cited 2019 Dec 13]. Available from: https://scholarlyrepository.miami.edu/oa_dissertations/2308.

Council of Science Editors:

Lu X. South Pacific Tropical Water: Variability and Downstream Impacts. [Doctoral Dissertation]. University of Miami; 2019. Available from: https://scholarlyrepository.miami.edu/oa_dissertations/2308

University of Sydney

23. Orlowski, Jan Alexander Kazimierz. The ENSO Cycle and Predictability of US Crop Yields .

Degree: 2017, University of Sydney

URL: http://hdl.handle.net/2123/17166

► While the impacts of the El Nino Southern Oscillation (ENSO) are well documented on topics ranging from agricultural production to socio-economic factors, a closer consideration… (more)

Subjects/Keywords: ENSO; Forecasting; US Yield Risk; Threshold Regression

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Orlowski, J. A. K. (2017). The ENSO Cycle and Predictability of US Crop Yields . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/17166

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):

Orlowski, Jan Alexander Kazimierz. “The ENSO Cycle and Predictability of US Crop Yields .” 2017. Thesis, University of Sydney. Accessed December 13, 2019. http://hdl.handle.net/2123/17166.

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

MLA Handbook (7^th Edition):

Orlowski, Jan Alexander Kazimierz. “The ENSO Cycle and Predictability of US Crop Yields .” 2017. Web. 13 Dec 2019.

Vancouver:

Orlowski JAK. The ENSO Cycle and Predictability of US Crop Yields . [Internet] [Thesis]. University of Sydney; 2017. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/2123/17166.

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

Council of Science Editors:

Orlowski JAK. The ENSO Cycle and Predictability of US Crop Yields . [Thesis]. University of Sydney; 2017. Available from: http://hdl.handle.net/2123/17166

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

University of Arizona

24. Zemp, Christopher. An Attempt at Resolving the Western North American Enso Precipitation Dipole within Large-Scale Tree-Ring Networks .

Degree: 2018, University of Arizona

URL: http://hdl.handle.net/10150/630125

► Previous research has identified the El Niño Southern Oscillation (ENSO) as a main driver of North American precipitation west of the Rocky Mountains. ENSO drives… (more)

Subjects/Keywords: dendrochronology; dendroclimatology; dipole; ENSO; network; tree-ring

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Zemp, C. (2018). An Attempt at Resolving the Western North American Enso Precipitation Dipole within Large-Scale Tree-Ring Networks . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/630125

Chicago Manual of Style (16^th Edition):

Zemp, Christopher. “An Attempt at Resolving the Western North American Enso Precipitation Dipole within Large-Scale Tree-Ring Networks .” 2018. Masters Thesis, University of Arizona. Accessed December 13, 2019. http://hdl.handle.net/10150/630125.

MLA Handbook (7^th Edition):

Zemp, Christopher. “An Attempt at Resolving the Western North American Enso Precipitation Dipole within Large-Scale Tree-Ring Networks .” 2018. Web. 13 Dec 2019.

Vancouver:

Zemp C. An Attempt at Resolving the Western North American Enso Precipitation Dipole within Large-Scale Tree-Ring Networks . [Internet] [Masters thesis]. University of Arizona; 2018. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/10150/630125.

Council of Science Editors:

Zemp C. An Attempt at Resolving the Western North American Enso Precipitation Dipole within Large-Scale Tree-Ring Networks . [Masters Thesis]. University of Arizona; 2018. Available from: http://hdl.handle.net/10150/630125

25. Engström, Erika. De nya EU-direktiven om hållbarhetsrapportering : En fallstudie genomförd på Stora Enso.

Degree: Business Administration and Management, 2016, Dalarna University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:du-22482

►

Bakgrund Denna uppsats behandlar de nya EU-kraven som föreslås träda i kraft från och med det räkenskapsår som inleds närmast efter den 31 december… (more)

▼

Bakgrund Denna uppsats behandlar de nya EU-kraven som föreslås träda i kraft från och med det räkenskapsår som inleds närmast efter den 31 december 2016. Uppsatsen har undersökt hur Stora Enso arbetar med hållbarhetsrapportering enligt Global Reporting Initiatives riktlinjer. Detta eftersom att Stora Enso var det första börsnoterade företaget i Sverige vars hållbarhetsrapportering granskats av en tredje part. Vidare siktar denna uppsats på att ge de företag som ej tidigare har erfarenhet från hållbarhetsrapportering en inspirationskälla, som stöd i upprättningen av egna hållbarhetsrapporter. Syfte Syftet med den här fallstudien är att beskriva hur ett företag som redan innan EU-kraven börjat tillämpats rapporterat i enlighet med dessa, och hur de aktivt arbetar med hållbarhetsrapportering. Metod Fallstudie: intervjuer och dokumentanalys. Slutsats Det är viktigt att hela tiden fortsätta förbättra företagets hållbara utveckling och dess mål. Stora Ensos hållbarhetsrapportering kopplades ihop med den hållbara utvecklingen i stort, och här sågs att rapporteringen har hjälpt Stora Enso att uppnå och utveckla sina hållbarhetsmål. Utan hållbarhetsrapporteringen skulle Stora Ensos positiva utveckling inte varit lika omfattande. Utifrån de intervjuer som genomfördes konstaterades det att GRI:s riktlinjer medför både en fördel och en nackdel: de är väldigt omfattande.

Background This study describes the new requirements from the European Union, which are supposed to come in to effect in the first financial year that ushers after December 31th 2016. We have examined how Stora Enso works with its sustainability reports according to the Global Reporting Inititative's guidelines. Stora Enso was considered a suitable candidate because it was the first publicly listed company in Sweden which had its sustainability report audited by a third party. Furthermore, this study aims to give inspiration and support to companies without previous experience with sustainability reporting. Purpose The purpose of this case study is to describe how a specific company reported in accordance with the EU-directives regarding sustainability reporting, even before they come in to effect. And also describe how they actively works with their sustainability reporting. Methods Case study: interviews and public documents. Conclusion It is important that the company keeps improving their sustainable development and their goals. Stora Ensos sustainability reporting was connected to the sustainable development, without the sustainability reports Stora Enso would have had a harder time developing in a sustainable manner and probably not had such a big positive change. From the interviews that was performed, we concluded that GRI’s guidelines brings both an advantage and a disadvantage: it is comprehensive.

Subjects/Keywords: Sustainability reporting; sustainable development; Euro directive; Stora Enso.; Hållbarhetsrapportering; hållbar utveckling; EU-direktiv; Stora Enso.

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Engström, E. (2016). De nya EU-direktiven om hållbarhetsrapportering : En fallstudie genomförd på Stora Enso. (Thesis). Dalarna University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:du-22482

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):

Engström, Erika. “De nya EU-direktiven om hållbarhetsrapportering : En fallstudie genomförd på Stora Enso.” 2016. Thesis, Dalarna University. Accessed December 13, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:du-22482.

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

MLA Handbook (7^th Edition):

Engström, Erika. “De nya EU-direktiven om hållbarhetsrapportering : En fallstudie genomförd på Stora Enso.” 2016. Web. 13 Dec 2019.

Vancouver:

Engström E. De nya EU-direktiven om hållbarhetsrapportering : En fallstudie genomförd på Stora Enso. [Internet] [Thesis]. Dalarna University; 2016. [cited 2019 Dec 13]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:du-22482.

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

Council of Science Editors:

Engström E. De nya EU-direktiven om hållbarhetsrapportering : En fallstudie genomförd på Stora Enso. [Thesis]. Dalarna University; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:du-22482

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

26. Saint-Lu, Marion. Étude des liens entre les événements El Niño et le cycle hydrologique des régions tropicales dans différents contextes climatiques : Links between El Niño events and the hydrological cycle of tropical regions in different climatic contexts.

Degree: Docteur es, Météorologie, Océanographie, Physique de l’Environnement, 2015, Paris Saclay

URL: http://www.theses.fr/2015SACLV028

►

La variabilité interannuelle du Pacifique tropical est aujourd’hui principalement modulée par l’oscillation ElNiño/Oscillation Australe (ENSO). Étant donnés les forts impacts économiques et sanitaires de ce… (more)

▼

La variabilité interannuelle du Pacifique tropical est aujourd’hui principalement modulée par l’oscillation ElNiño/Oscillation Australe (ENSO). Étant donnés les forts impacts économiques et sanitaires de ce phénomène,la compréhension de son évolution au fil du temps représente un enjeu majeur. Étudier la variabilité ENSOdans différents contextes climatiques permet de comprendre comment celle-ci est reliée à l’état moyen duclimat. Nous utilisons des simulations climatiques de l’Holocène moyen (6 000 ans et 4 000 ans avant nosjours), du dernier maximum glaciaire (21 000 ans avant nos jours) et d’un climat théorique avec le dioxyde decarbone atmosphérique multiplié par quatre, réalisées avec plusieurs modèles numériques. Nous montrons que lavariabilité ENSO a des caractéristiques significativement différentes dans chaque contexte climatique. Les liensentre ces différences et l’état moyen du climat sont nombreux et non linéaires. L’étude des paléoclimats est alorsnécessaire pour comprendre les changements d’ENSO et pouvoir projeter son évolution future. De nombreusesarchives climatiques utilisées pour reconstruire le paléo-ENSO sont situées dans le sud-ouest du Pacifiquetropical, sous l’influence de la zone de convergence du Pacifique sud (SPCZ). Nous montrons que l’impactd’ENSO sur la position de la SPCZ change avec le climat. Or, celui-ci est déterminant pour l’interprétation dusignal issu des archives. Ainsi, les mécanismes reliant ENSO à la SPCZ dans le climat moderne ne peuvent pasêtre directement extrapolés à d’autres contextes climatiques. En combinant l’information des modèles et desarchives, nous pouvons avancer sur la compréhension des changements de variabilité dans le Pacifique sudouestet sur l’interprétation des enregistrements fossiles. En dernier lieu, nous abordons les changements de lavariabilité ENSO avec un nouvel angle de vue, celui de son rôle au sein du bilan énergétique global. D’aprèsles résultats du modèle IPSL-CM5A-LR, la contribution relative des événements El Niño à la redistributionglobale d’énergie est amoindrie à l’Holocène moyen, par rapport au climat moderne. Par ailleurs, la capacitédu Pacifique tropical à exporter l’énergie en moyenne est aussi réduite. Ainsi, la pompe à chaleur globaleconstituée par le Pacifique tropical est moins puissante à l’Holocène moyen, à la fois par la réduction de sacapacité moyenne à exporter que par la contribution amoindrie d’El Niño. Ce résultat suggère qu’il y a unecohérence entre le changement d’ENSO et le rôle de pompe à chaleur joué par le Pacifique tropical.

Interannual variability in the tropical Pacific is mainly modulated by the El Niño / Southern Oscillation (ENSO).Understanding the time evolution of this phenomenon is a major issue, given its strong impacts on health andeconomics. Studying the ENSO variability in different climatic contexts allows us to understand its links to themean-state. We use climatic simulations of the mid-Holocene (6,000 years and 4,000 years before present),the last glacial maximum (21,000 years before present) and a…

Advisors/Committee Members: Braconnot, Pascale (thesis director), Marti, Olivier (thesis director).

Subjects/Keywords: El-Niño; Variabilité; Tropiques; Climat; Changement; ENSO; El-Niño; Variability; Tropics; Climate; Change; ENSO; 551.46

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Saint-Lu, M. (2015). Étude des liens entre les événements El Niño et le cycle hydrologique des régions tropicales dans différents contextes climatiques : Links between El Niño events and the hydrological cycle of tropical regions in different climatic contexts. (Doctoral Dissertation). Paris Saclay. Retrieved from http://www.theses.fr/2015SACLV028

Chicago Manual of Style (16^th Edition):

Saint-Lu, Marion. “Étude des liens entre les événements El Niño et le cycle hydrologique des régions tropicales dans différents contextes climatiques : Links between El Niño events and the hydrological cycle of tropical regions in different climatic contexts.” 2015. Doctoral Dissertation, Paris Saclay. Accessed December 13, 2019. http://www.theses.fr/2015SACLV028.

MLA Handbook (7^th Edition):

Saint-Lu, Marion. “Étude des liens entre les événements El Niño et le cycle hydrologique des régions tropicales dans différents contextes climatiques : Links between El Niño events and the hydrological cycle of tropical regions in different climatic contexts.” 2015. Web. 13 Dec 2019.

Vancouver:

Saint-Lu M. Étude des liens entre les événements El Niño et le cycle hydrologique des régions tropicales dans différents contextes climatiques : Links between El Niño events and the hydrological cycle of tropical regions in different climatic contexts. [Internet] [Doctoral dissertation]. Paris Saclay; 2015. [cited 2019 Dec 13]. Available from: http://www.theses.fr/2015SACLV028.

Council of Science Editors:

Saint-Lu M. Étude des liens entre les événements El Niño et le cycle hydrologique des régions tropicales dans différents contextes climatiques : Links between El Niño events and the hydrological cycle of tropical regions in different climatic contexts. [Doctoral Dissertation]. Paris Saclay; 2015. Available from: http://www.theses.fr/2015SACLV028

27. Guillermic, Maxence. From systematics to applications : Boron-based proxies in different types of biogenic carbonates : Des systématiques aux applications : les traceurs à base de bore dans différents types de carbonates biogéniques.

Degree: Docteur es, Géosciences marines, 2018, Brest

URL: http://www.theses.fr/2018BRES0112

►

Les traceurs à base de bore (δ11B et B/Ca) dans les carbonates ont reçu une attention considérable au cours des dernières décennies dans le domaine… (more)

▼

Les traceurs à base de bore (δ11B et B/Ca) dans les carbonates ont reçu une attention considérable au cours des dernières décennies dans le domaine des géosciences de par leur potentiel à recalculer le pH. Cette thèse explore les frontières des applications de ces traceurs à la paléocéanographie et à la biogéochimie. A cause de la montée des teneurs en CO2 d’origine anthropique, il est devenu extrêmement important de comprendre comment les systèmes de la Terre répondront dans le futur. Les organismes marins sont aussi impactés par le réchauffement et l’acidification des océans, c’est pourquoi il est essentiel d’identifier les espèces résilientes et de comprendre les mécanismes sous-jacents à leur acclimatation. Les objectifs de cette thèse sont de répondre à certaines questions fondamentales, comment le CO2 atmosphérique a évolué au cours des transitions climatiques majeures du Néogène? Comment le dégazage ou l’absorption de carbone ont-ils évolué dans l’Est équatorial Pacifique au cours des derniers 6.5 Ma? Les changements de source et puits de carbones peuvent-ils moduler le CO2 atmosphérique passé et expliquer les transitions climatiques? Et pour les organismes marins, comment les mécanismes permettant la biominéralisation sont-ils impactés par l’augmentation des températures et l’acidification des océans dans les coraux tropicaux ?

Boron-based proxies (δ11B and B/Ca) in carbonates have gained considerable attention in the geosciences over the last several decades, given their potential to constrain pH. This thesis explores frontier applications of these proxies to paleoceanography and biogeochemistry. Due to rising anthropogenic CO2 levels, it is becoming increasingly important to understand how Earth’s systems will respond in the future.Marine organisms are also impacted by the warming and acidification of the ocean, therefore it is essential to identify resilient species and understand the underlying mechanisms of acclimatization.The objectives of this thesis are to answer several fundamental questions, for instance, how has atmospheric CO2 changed during major climate transitions over the Neogene? How did degassing or absorption of carbon evolve in the East equatorial Pacific during the last 6.5 Ma? Can changes of sources and sinks modulate past atmospheric CO2 and explain past climate transitions? And for marine organisms, how are the mechanisms allowing biomineralization impacted by increased temperature and the acidification of the ocean in tropical corals?

Advisors/Committee Members: Barrat, Jean-Alix (thesis director).

Subjects/Keywords: Bore; CO2; Climat; Coraux; Pacifique; ENSO; Boron; CO2; Climate; Corals; Pacific; ENSO

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Guillermic, M. (2018). From systematics to applications : Boron-based proxies in different types of biogenic carbonates : Des systématiques aux applications : les traceurs à base de bore dans différents types de carbonates biogéniques. (Doctoral Dissertation). Brest. Retrieved from http://www.theses.fr/2018BRES0112

Chicago Manual of Style (16^th Edition):

Guillermic, Maxence. “From systematics to applications : Boron-based proxies in different types of biogenic carbonates : Des systématiques aux applications : les traceurs à base de bore dans différents types de carbonates biogéniques.” 2018. Doctoral Dissertation, Brest. Accessed December 13, 2019. http://www.theses.fr/2018BRES0112.

MLA Handbook (7^th Edition):

Guillermic, Maxence. “From systematics to applications : Boron-based proxies in different types of biogenic carbonates : Des systématiques aux applications : les traceurs à base de bore dans différents types de carbonates biogéniques.” 2018. Web. 13 Dec 2019.

Vancouver:

Guillermic M. From systematics to applications : Boron-based proxies in different types of biogenic carbonates : Des systématiques aux applications : les traceurs à base de bore dans différents types de carbonates biogéniques. [Internet] [Doctoral dissertation]. Brest; 2018. [cited 2019 Dec 13]. Available from: http://www.theses.fr/2018BRES0112.

Council of Science Editors:

Guillermic M. From systematics to applications : Boron-based proxies in different types of biogenic carbonates : Des systématiques aux applications : les traceurs à base de bore dans différents types de carbonates biogéniques. [Doctoral Dissertation]. Brest; 2018. Available from: http://www.theses.fr/2018BRES0112

28. Puy, Martin. L'influence des coups de vent d'ouest dans le Pacifique équatorial sur El Niño : origines atmosphériques et impacts océaniques : The influence of equatorial pacific westerly wind events on El Niño : atmospheric origins and oceanic impacts.

Degree: Docteur es, Océanographie physique, 2016, Université Pierre et Marie Curie – Paris VI

URL: http://www.theses.fr/2016PA066020

►

Les coups de vent d’ouest (WWEs) issu de la variabilité synoptique atmosphérique jouent un rôle crucial dans les irrégularités d’ENSO en contribuant au déclenchement et… (more)

▼

Les coups de vent d’ouest (WWEs) issu de la variabilité synoptique atmosphérique jouent un rôle crucial dans les irrégularités d’ENSO en contribuant au déclenchement et au développement de sa phase chaude, El Niño. Les WWEs sont des événements haute fréquence peu prévisibles et dont les origines atmosphériques restent encore débattues. Dans le but d’affiner la prévisibilité d’ENSO, cette thèse caractérise la part stochastique de la part prévisible des WWEs ainsi que de leur réponse océanique et couplée. Dans une première partie, j’ai relié l’occurrence et les caractéristiques des coups de vent à des phénomènes de grande échelle comme l'oscillation de Madden-Julian, les ondes de Rossby atmosphériques et ENSO, à partir d’analyse d’observations. Ensuite, la forte sensibilité de la réponse océanique des WWEs à l’état de l’océan a été mise en évidence grâce à une série de simulations océaniques forcées. Finalement, une simulation d’ensemble réalisée avec un modèle couplé océan-atmosphère a permis d'explorer le rôle des WWEs dans l’évolution contrastée des années 1997,2014 et 2015 qui présentaient des conditions similaires et favorables au déclenchement d'El Niño. Les résultats de ce travail montrent que la stochasticité des WWEs aboutit à une limitation intrinsèque de la prévisibilité des caractéristiques d’El Niño.

Equatorial Pacific Westerly Wind Events (WWEs) impact ENSO evolution through their oceanic response and strongly contribute to its irregularities. WWEs are characterized by episodes of anomalous, short-lived, strong westerlies developing over the western Pacific warm pool. This thesis characterize the atmospheric origins and the oceanic and coupled impacts of these events in order to improve ENSO prediction. First, we show that, at intraseasonnal timescale, the Madden-Julian oscillation and the convectively coupled Rossby waves provide favourable conditions for the occurence of WWEs and confirm their modulation by ENSO at interannual timescale. Oceanic simulation with idealized forcing further allow characterizing and understanding the modulation of the SST response to WWE by the oceanic background state. Finally, The role of WWEs in the contrasted evolution of El Niño in 1997,2014 and 2015, which exhibited favourable conditions for El Niño to develop, is explored in ensemble simulations using a coupled ocean-atmosphere model. It is shown that the stochasticity of the WWEs acts as a strong limitation for ENSO predictability.

Advisors/Committee Members: Guilyardi, Eric (thesis director), Lengaigne, Matthieu (thesis director).

Subjects/Keywords: Coups de vent d'ouest; MJO; Ondes de Rossby; Convection; ENSO; NEMO; Westerly wind events; Predictability; Equatorial pacific; ENSO; 551.46

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Puy, M. (2016). L'influence des coups de vent d'ouest dans le Pacifique équatorial sur El Niño : origines atmosphériques et impacts océaniques : The influence of equatorial pacific westerly wind events on El Niño : atmospheric origins and oceanic impacts. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2016PA066020

Chicago Manual of Style (16^th Edition):

Puy, Martin. “L'influence des coups de vent d'ouest dans le Pacifique équatorial sur El Niño : origines atmosphériques et impacts océaniques : The influence of equatorial pacific westerly wind events on El Niño : atmospheric origins and oceanic impacts.” 2016. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed December 13, 2019. http://www.theses.fr/2016PA066020.

MLA Handbook (7^th Edition):

Puy, Martin. “L'influence des coups de vent d'ouest dans le Pacifique équatorial sur El Niño : origines atmosphériques et impacts océaniques : The influence of equatorial pacific westerly wind events on El Niño : atmospheric origins and oceanic impacts.” 2016. Web. 13 Dec 2019.

Vancouver:

Puy M. L'influence des coups de vent d'ouest dans le Pacifique équatorial sur El Niño : origines atmosphériques et impacts océaniques : The influence of equatorial pacific westerly wind events on El Niño : atmospheric origins and oceanic impacts. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2016. [cited 2019 Dec 13]. Available from: http://www.theses.fr/2016PA066020.

Council of Science Editors:

Puy M. L'influence des coups de vent d'ouest dans le Pacifique équatorial sur El Niño : origines atmosphériques et impacts océaniques : The influence of equatorial pacific westerly wind events on El Niño : atmospheric origins and oceanic impacts. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2016. Available from: http://www.theses.fr/2016PA066020

29. Vergara, Oscar. Ventilation de la circulation océanique dans le Pacifique sud-est par les ondes de Rossby et l'activité méso-échelle : téléconnexions d'ENSO : Ventilation of the oceanic circulation in the Southeast Pacific by mesoscale activity and Rossby waves at interannual to decadal timescales : ENSO teleconnections.

Degree: Docteur es, Océanographie, 2017, Université Toulouse III – Paul Sabatier

URL: http://www.theses.fr/2017TOU30356

► L'objectif principal de cette thèse est l'étude de la connexion entre la variabilité dans l'océan Pacifique équatorial et la circulation de subsurface le long des… (more)

▼ L'objectif principal de cette thèse est l'étude de la connexion entre la variabilité dans l'océan Pacifique équatorial et la circulation de subsurface le long des côtes du Pérou et du Chili, à des échelles de temps interannuelles à décennales. Les diagnostiques menés dans ce travail se basent sur un modèle régional océanique. L'accent est mis sur l'interprétation de la propagation verticale de la variabilité dans les couches intermédiaires de l'océan, où l'on trouve une intense zone de minimum d'oxygène (OMZ ; de l'anglais Oxygen Minimum Zone), et la relation de cette propagation verticale avec les processus advectifs et diffusifs. La propagation verticale est diagnostiquée à travers le flux vertical d'énergie associé à la propagation verticale de l'onde de Rossby extratropicale (ETRW; de l'anglais Extra-Tropical Rossby Wave). Aux échelles de temps interannuelles, les résultats montrent que 80% du flux vertical d'énergie dans l'océan Pacifique Sud-Est (SEP ; de l'anglais South-Eastern Pacific) est associé aux événements El Niño extraordinaires. Ce flux d'énergie s'étend vers l'Ouest en suivant les rayons théoriques WKB, avec une pente plus prononcée au fur et à mesure que la latitude augmente. Les analyses du flux d'énergie mettent aussi en évidence l'existence d'une modulation du flux d'énergie interannuel à l'échelle décennale, qui serait liée aux fluctuations décennales et inter-décennales dans le Pacifique équatorial. Une décomposition de la stratification en modes verticaux montre que le flux d'énergie associé à El Niño et aux fluctuations décennales se projette sur les trois premiers modes baroclines, ce qui confirme l'interprétation du flux d'énergie comme la propagation de l'onde de Rossby. Des tests de sensibilité menés avec un modèle linéaire ajusté aux conditions de la simulation montrent que la propagation d'énergie verticale pendant les événements El Niño est aussi impactée par la contribution des modes baroclines supérieurs. La variabilité méridienne/verticale du flux d'énergie vertical met en évidence une atténuation de l'amplitude le long de la trajectoire de l'onde, ce qui est interprété comme un flux diffusif de chaleur induit par la dissipation de l'onde. La variabilité de subsurface de la circulation à l'échelle saisonnière est aussi étudiée dans cette région à travers la ventilation de l'OMZ. Les résultats montrent que la variabilité saisonnière de l'OMZ en dessous de 400 m de profondeur possède des caractéristiques de propagation similaires à celles du flux d'énergie associé à l'ETRW annuelle, ce qui indique que l'ETRWpourrait influencer la variabilité de l'OMZ profonde, du moins à l'échelle saisonnière. Au-dessus de 400 m de profondeur, le processus dominant qui influence la ventilation de l'OMZ à l'échelle saisonnière est le transport d'oxygène par les tourbillons de méso-échelle. Dans ce travail, nous mettons en évidence la nature complexe de la variabilité de la circulation de subsurface dans le SEP. Nous montrons en particulier la connexion entre la circulation sous la thermocline… Advisors/Committee Members: Dewitte, Boris (thesis director).

Subjects/Keywords: Onde de Rossby; Océan Pacifique sud; ENSO; Humboldt; Flux d'énergie vertical; Rossby wave; South pacific ocean; ENSO; Humboldt; Vertical energy flux

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Vergara, O. (2017). Ventilation de la circulation océanique dans le Pacifique sud-est par les ondes de Rossby et l'activité méso-échelle : téléconnexions d'ENSO : Ventilation of the oceanic circulation in the Southeast Pacific by mesoscale activity and Rossby waves at interannual to decadal timescales : ENSO teleconnections. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2017TOU30356

Chicago Manual of Style (16^th Edition):

Vergara, Oscar. “Ventilation de la circulation océanique dans le Pacifique sud-est par les ondes de Rossby et l'activité méso-échelle : téléconnexions d'ENSO : Ventilation of the oceanic circulation in the Southeast Pacific by mesoscale activity and Rossby waves at interannual to decadal timescales : ENSO teleconnections.” 2017. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed December 13, 2019. http://www.theses.fr/2017TOU30356.

MLA Handbook (7^th Edition):

Vergara, Oscar. “Ventilation de la circulation océanique dans le Pacifique sud-est par les ondes de Rossby et l'activité méso-échelle : téléconnexions d'ENSO : Ventilation of the oceanic circulation in the Southeast Pacific by mesoscale activity and Rossby waves at interannual to decadal timescales : ENSO teleconnections.” 2017. Web. 13 Dec 2019.

Vancouver:

Vergara O. Ventilation de la circulation océanique dans le Pacifique sud-est par les ondes de Rossby et l'activité méso-échelle : téléconnexions d'ENSO : Ventilation of the oceanic circulation in the Southeast Pacific by mesoscale activity and Rossby waves at interannual to decadal timescales : ENSO teleconnections. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2017. [cited 2019 Dec 13]. Available from: http://www.theses.fr/2017TOU30356.

Council of Science Editors:

Vergara O. Ventilation de la circulation océanique dans le Pacifique sud-est par les ondes de Rossby et l'activité méso-échelle : téléconnexions d'ENSO : Ventilation of the oceanic circulation in the Southeast Pacific by mesoscale activity and Rossby waves at interannual to decadal timescales : ENSO teleconnections. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2017. Available from: http://www.theses.fr/2017TOU30356

Texas A&M University

30. Perugachi Salamea, Carlos. Analysis of Upwelling Changes in the Eastern Equatorial Pacific during El Ni?o Southern Oscillation.

Degree: 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10374

► The ocean reanalysis Simple Ocean Data Assimilation (SODA) 2.2.4 is used to explore the changes in upwelling from normal conditions to either El Nino or… (more)

▼ The ocean reanalysis Simple Ocean Data Assimilation (SODA) 2.2.4 is used to explore the changes in upwelling from normal conditions to either El Nino or La Nina conditions. Physical and thermodynamic variables from the reanalysis are used to explore the structure and behavior of El Nino Southern Oscillation (ENSO) events. The results of this analysis show that sea surface temperature (SST), entrainment velocity, wind stress, mixed layer depth, wind curl, and heat content anomalies are in general agreement with ENSO theory. Interestingly, the distribution of upwelling based on the entrainment velocity is very patchy, which led us to explore zonal and meridional sections of vertical velocity. We used three methods to compute changes in upwelling during ENSO events. The first method computes upwelling within the areas of SST anomalies during ENSO events. During El Nino events upwelling shows prominent decadal variability, while during La Nina the decadal variability is weaker. A new upwelling index is used for the second method, and upwelling is computed in the areas of strong upwelling anomalies. The variability of upwelling is higher in periods of reduced upwelling than in periods of strong upwelling. Despite the fact that the new index is computed independently, it agrees in the timing of the index used to define ENSO events for this research. The first and second methods show that the amplitude of SST anomalies and upwelling anomalies do not have a direct relationship, suggesting that upwelling does not explain all of the variance in SST. The last method used is to compute changes in upwelling in the Nino 1+2 region during ENSO events. In the east Pacific there is almost no correlation between upwelling and SST anomalies during ENSO, but this might be attributed to the fact that the Nino 1+2 region is a relatively small region compared to the Nino 3.4 region that is used to define ENSO events. In general, the time series of SST and upwelling anomalies agree well just in the cases when ENSO events are prominently in the eastern Pacific. A comparison between yearly fisheries data from Ecuador and Peru and monthly data of SST anomalies during ENSO years is presented showing that during El Nino events the fish catch decreases and during La Nina events the fish catch increases. We infer that the increase or decrease in fish catch is associated to changes in fish populations, and that these changes are mainly due to availability of nutrients and changes in temperature during ENSO events. Advisors/Committee Members: Giese, Benjamin (advisor), North, Gerald (committee member), Seidel, Howard (committee member).

Subjects/Keywords: El Ni?o Southern Oscillation; ENSO; SODA; upwelling; Eastern Equatorial Pacific

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Perugachi Salamea, C. (2012). Analysis of Upwelling Changes in the Eastern Equatorial Pacific during El Ni?o Southern Oscillation. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10374

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):

Perugachi Salamea, Carlos. “Analysis of Upwelling Changes in the Eastern Equatorial Pacific during El Ni?o Southern Oscillation.” 2012. Thesis, Texas A&M University. Accessed December 13, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10374.

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

MLA Handbook (7^th Edition):

Perugachi Salamea, Carlos. “Analysis of Upwelling Changes in the Eastern Equatorial Pacific during El Ni?o Southern Oscillation.” 2012. Web. 13 Dec 2019.

Vancouver:

Perugachi Salamea C. Analysis of Upwelling Changes in the Eastern Equatorial Pacific during El Ni?o Southern Oscillation. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10374.

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

Council of Science Editors:

Perugachi Salamea C. Analysis of Upwelling Changes in the Eastern Equatorial Pacific during El Ni?o Southern Oscillation. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10374

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

Open Access Theses and Dissertations