The response of stable water isotopes in precipitation and the surface ocean to tropical climate variability
Typescript (photocopy) Thesis (PhD) -- University of Melbourne, Faculty of Science, 2004 Includes bibliographical references (leaves 259-280) Stable water isotope records may be used to reconstruct tropical climate variability on seasonal to glacial time scales. Isotopic ratios in precipitation are...
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ftumelbourne:oai:jupiter.its.unimelb.edu.au:11343/341611 2024-06-02T08:14:21+00:00 The response of stable water isotopes in precipitation and the surface ocean to tropical climate variability Brown, Josephine. 2004 http://hdl.handle.net/11343/341611 English eng University of Melbourne THSS_b2865761-00001 http://hdl.handle.net/11343/341611 Copyright in works deposited in Minerva Access is retained by the copyright owner. The work may not be altered without permission from the copyright owner. Readers may only download, print and save electronic copies of whole works for their own personal non-commercial use. Any use that exceeds these limits requires permission from the copyright owner. Attribution is essential when quoting or paraphrasing from these works. Stable isotopes Atmospheric circulation -- Tropics PhD thesis 2004 ftumelbourne 2024-05-06T13:15:31Z Typescript (photocopy) Thesis (PhD) -- University of Melbourne, Faculty of Science, 2004 Includes bibliographical references (leaves 259-280) Stable water isotope records may be used to reconstruct tropical climate variability on seasonal to glacial time scales. Isotopic ratios in precipitation are archived in tropical ice cores, and may be interpreted as records of precipitation, temperature and atmospheric circulation variability in the tropics. Isotopic ratios in the carbonate skeletons of coral and foraminifera record local and mean ocean isotopic ratios as well as sea surface temperature. Reconstruction of past climate from isotopic records requires assumptions about the isotope-climate relationship on the relevant time scale. In order to test these assumptions, an isotopic tracer scheme in the Melbourne University General Circulation Model is- used to simulate the isotope-climate relationship for present day and Last Glacial Maximum climate. A scheme to calculate surface ocean and river runoff isotopic ratios is developed and used to test the sensitivity of the surface ocean isotopic distribution to changes in climate forcing. Present day climate from 1950-1999 is simulated using observed sea surface temperatures and sea ice coverage, and the interannual variability of the modelled isotopic ratios in precipitation and the surface ocean are compared with observational records. On interannual time scales, the modelled isotopic ratios in tropical precipitation are predominantly controlled by precipitation amount. The isotopic signal also reflects strong modes of tropical climate variability, including El Nino-Southern Oscillation and monsoon variability. The modelled surface ocean isotopic ratios respond to interannual precipitation and evaporation variability, with a strong El Nino-Southern Oscillation signal in the tropical Pacific. The isotopic variability archived in coral and foraminiferal carbonates reflects both sea surface temperature and local precipitation and evaporation changes, and a ... Doctoral or Postdoctoral Thesis Sea ice The University of Melbourne: Digital Repository Pacific |
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The University of Melbourne: Digital Repository |
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English |
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Stable isotopes Atmospheric circulation -- Tropics |
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Stable isotopes Atmospheric circulation -- Tropics Brown, Josephine. The response of stable water isotopes in precipitation and the surface ocean to tropical climate variability |
topic_facet |
Stable isotopes Atmospheric circulation -- Tropics |
description |
Typescript (photocopy) Thesis (PhD) -- University of Melbourne, Faculty of Science, 2004 Includes bibliographical references (leaves 259-280) Stable water isotope records may be used to reconstruct tropical climate variability on seasonal to glacial time scales. Isotopic ratios in precipitation are archived in tropical ice cores, and may be interpreted as records of precipitation, temperature and atmospheric circulation variability in the tropics. Isotopic ratios in the carbonate skeletons of coral and foraminifera record local and mean ocean isotopic ratios as well as sea surface temperature. Reconstruction of past climate from isotopic records requires assumptions about the isotope-climate relationship on the relevant time scale. In order to test these assumptions, an isotopic tracer scheme in the Melbourne University General Circulation Model is- used to simulate the isotope-climate relationship for present day and Last Glacial Maximum climate. A scheme to calculate surface ocean and river runoff isotopic ratios is developed and used to test the sensitivity of the surface ocean isotopic distribution to changes in climate forcing. Present day climate from 1950-1999 is simulated using observed sea surface temperatures and sea ice coverage, and the interannual variability of the modelled isotopic ratios in precipitation and the surface ocean are compared with observational records. On interannual time scales, the modelled isotopic ratios in tropical precipitation are predominantly controlled by precipitation amount. The isotopic signal also reflects strong modes of tropical climate variability, including El Nino-Southern Oscillation and monsoon variability. The modelled surface ocean isotopic ratios respond to interannual precipitation and evaporation variability, with a strong El Nino-Southern Oscillation signal in the tropical Pacific. The isotopic variability archived in coral and foraminiferal carbonates reflects both sea surface temperature and local precipitation and evaporation changes, and a ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Brown, Josephine. |
author_facet |
Brown, Josephine. |
author_sort |
Brown, Josephine. |
title |
The response of stable water isotopes in precipitation and the surface ocean to tropical climate variability |
title_short |
The response of stable water isotopes in precipitation and the surface ocean to tropical climate variability |
title_full |
The response of stable water isotopes in precipitation and the surface ocean to tropical climate variability |
title_fullStr |
The response of stable water isotopes in precipitation and the surface ocean to tropical climate variability |
title_full_unstemmed |
The response of stable water isotopes in precipitation and the surface ocean to tropical climate variability |
title_sort |
response of stable water isotopes in precipitation and the surface ocean to tropical climate variability |
publisher |
University of Melbourne |
publishDate |
2004 |
url |
http://hdl.handle.net/11343/341611 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
THSS_b2865761-00001 http://hdl.handle.net/11343/341611 |
op_rights |
Copyright in works deposited in Minerva Access is retained by the copyright owner. The work may not be altered without permission from the copyright owner. Readers may only download, print and save electronic copies of whole works for their own personal non-commercial use. Any use that exceeds these limits requires permission from the copyright owner. Attribution is essential when quoting or paraphrasing from these works. |
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