HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE
Large-scale climate modes such as the El Niño/Southern Oscillation (ENSO), the Asian monsoon, and the Arctic Oscillation are responsible for much of the Earth’s climate variability. Despite the importance of these modes, we have limited understanding of how they vary on long (multidecadal to millenn...
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The University of Arizona.
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ftunivarizona:oai:repository.arizona.edu:10150/145432 2024-09-09T19:21:46+00:00 HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE Conroy, Jessica Overpeck, Jonathan T. Cole, Julia Cohen, Andrew Russell, Joellen Quade, Jay 2011 http://hdl.handle.net/10150/145432 en eng The University of Arizona. http://hdl.handle.net/10150/145432 752261498 11655 Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Asian monsoon dust Galapagos lakes tropical Pacific Electronic Dissertation text 2011 ftunivarizona 2024-06-25T03:38:06Z Large-scale climate modes such as the El Niño/Southern Oscillation (ENSO), the Asian monsoon, and the Arctic Oscillation are responsible for much of the Earth’s climate variability. Despite the importance of these modes, we have limited understanding of how they vary on long (multidecadal to millennial) timescales due to the short length of instrumental climate records. Fortunately, climate information stored in natural archives can provide us with information on how these modes varied in the more distant past. Lake sediments are an ideal climate archive since they are continuous, have high temporal resolution, and contain many potential climate proxies. In the present study, I use lake sediment records to assess past climate and environmental changes associated with the El Niño/Southern Oscillation, the Asian monsoon, and the Arctic Oscillation. Exploring modern precipitation variability across the Asian monsoon region, I found that precipitation within this broad area is not coherent, which holds implications for paleorecords that are hypothesized to represent monsoon variability, including many lake sediment records on the Tibetan Plateau. Monsoon precipitation in the Arabian Sea is distinct from precipitation in India and China, and increased precipitation in the Arabian Sea coincides with decreased precipitation in the western North Pacific. Furthermore, only precipitation in southwestern Tibet responds to the Southwest monsoon, whereas precipitation in southeastern Tibet responds to the western North Pacific monsoon. In southwestern Tibet, I have reconstructed dust variability over the last millennium using the lake sediment record from Kiang Co. The sediment record shows a trend toward increasing dust over the 20th century, and our hypothesized dust proxy is positively correlated with the June-November Arctic Oscillation Index. A trend toward more positive Arctic Oscillation Index values as well as higher temperatures over the 20th century likely drove increased dustiness in southwestern Tibet, due the ... Doctoral or Postdoctoral Thesis Arctic The University of Arizona: UA Campus Repository Arctic Galapagos Pacific |
institution |
Open Polar |
collection |
The University of Arizona: UA Campus Repository |
op_collection_id |
ftunivarizona |
language |
English |
topic |
Asian monsoon dust Galapagos lakes tropical Pacific |
spellingShingle |
Asian monsoon dust Galapagos lakes tropical Pacific Conroy, Jessica HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE |
topic_facet |
Asian monsoon dust Galapagos lakes tropical Pacific |
description |
Large-scale climate modes such as the El Niño/Southern Oscillation (ENSO), the Asian monsoon, and the Arctic Oscillation are responsible for much of the Earth’s climate variability. Despite the importance of these modes, we have limited understanding of how they vary on long (multidecadal to millennial) timescales due to the short length of instrumental climate records. Fortunately, climate information stored in natural archives can provide us with information on how these modes varied in the more distant past. Lake sediments are an ideal climate archive since they are continuous, have high temporal resolution, and contain many potential climate proxies. In the present study, I use lake sediment records to assess past climate and environmental changes associated with the El Niño/Southern Oscillation, the Asian monsoon, and the Arctic Oscillation. Exploring modern precipitation variability across the Asian monsoon region, I found that precipitation within this broad area is not coherent, which holds implications for paleorecords that are hypothesized to represent monsoon variability, including many lake sediment records on the Tibetan Plateau. Monsoon precipitation in the Arabian Sea is distinct from precipitation in India and China, and increased precipitation in the Arabian Sea coincides with decreased precipitation in the western North Pacific. Furthermore, only precipitation in southwestern Tibet responds to the Southwest monsoon, whereas precipitation in southeastern Tibet responds to the western North Pacific monsoon. In southwestern Tibet, I have reconstructed dust variability over the last millennium using the lake sediment record from Kiang Co. The sediment record shows a trend toward increasing dust over the 20th century, and our hypothesized dust proxy is positively correlated with the June-November Arctic Oscillation Index. A trend toward more positive Arctic Oscillation Index values as well as higher temperatures over the 20th century likely drove increased dustiness in southwestern Tibet, due the ... |
author2 |
Overpeck, Jonathan T. Cole, Julia Cohen, Andrew Russell, Joellen Quade, Jay |
format |
Doctoral or Postdoctoral Thesis |
author |
Conroy, Jessica |
author_facet |
Conroy, Jessica |
author_sort |
Conroy, Jessica |
title |
HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE |
title_short |
HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE |
title_full |
HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE |
title_fullStr |
HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE |
title_full_unstemmed |
HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE |
title_sort |
history and dynamics of climate variability in the asian monsoon region and tropical pacific during the late holocene |
publisher |
The University of Arizona. |
publishDate |
2011 |
url |
http://hdl.handle.net/10150/145432 |
geographic |
Arctic Galapagos Pacific |
geographic_facet |
Arctic Galapagos Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://hdl.handle.net/10150/145432 752261498 11655 |
op_rights |
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. |
_version_ |
1809762021422399488 |