The contrasting effects of thermodynamic and dynamic processes on East Asian summer monsoon precipitation during the Last Glacial Maximum: a data-model comparison
Abstract The Last Glacial Maximum (LGM; 21 ka BP) was the most recent glacial period when the global ice sheet volume was at a maximum. Therefore, the LGM can be used to investigate atmospheric dynamics under a climate that differed significantly from the present. This study quantitatively compares...
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crspringernat:10.1007/s00382-020-05533-7 2023-05-15T16:41:32+02:00 The contrasting effects of thermodynamic and dynamic processes on East Asian summer monsoon precipitation during the Last Glacial Maximum: a data-model comparison Sun, Yong Wu, Haibin Kageyama, Masa Ramstein, Gilles Li, Laurent Z. X. Tan, Ning Lin, Yating Liu, Bo Zheng, Weipeng Zhang, Wenchao Zou, Liwei Zhou, Tianjun International Cooperation and Exchange Programme State Key Laboratory of Drug Research National Key Research and Development Program of China Ministry of Science and Technology of the People's Republic of China National Natural Science Foundation of China The Second Tibetan Plateau Scientific Expedition and Research (STEP) program 2020 http://dx.doi.org/10.1007/s00382-020-05533-7 http://link.springer.com/content/pdf/10.1007/s00382-020-05533-7.pdf http://link.springer.com/article/10.1007/s00382-020-05533-7/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Climate Dynamics volume 56, issue 3-4, page 1303-1316 ISSN 0930-7575 1432-0894 Atmospheric Science journal-article 2020 crspringernat https://doi.org/10.1007/s00382-020-05533-7 2022-01-14T15:39:10Z Abstract The Last Glacial Maximum (LGM; 21 ka BP) was the most recent glacial period when the global ice sheet volume was at a maximum. Therefore, the LGM can be used to investigate atmospheric dynamics under a climate that differed significantly from the present. This study quantitatively compares pollen records of boreal summer (June–July–August) precipitation with the PMIP3 LGM simulations. The data-model comparison shows an overall agreement on a drier than pre-industrial East Asian summer monsoon (EASM) climate. Nevertheless, 17 out of 55 records show a regional precipitation increase that is also simulated over the additional land mass area due to sea level drop. The thermodynamic and dynamic responses are analyzed to explain a drier LGM EASM as a combination of these two antagonistic mechanisms. Relatively low atmospheric moisture content was the main thermodynamic control on the lower LGM (relative to pre-industrial levels) EASM precipitation amounts in both the reconstructions and the models. In contrast, two dynamic processes in relation to stationary eddy activity act to increase EASM precipitation regionally in records and simulations, respectively. Precipitation increase in records is explained by dynamic enhancement of the horizontal moisture transport, while dynamic enhancement of the vertical moisture transport leads to simulated precipitation increase over the specific region where landmass was exposed during LGM along continental coastlines of China due to significant drop in sea level (relative to pre-industrial levels). Overall, the opposing effects of thermodynamic and dynamic processes on precipitation during the LGM provide a means to reconcile the spatial heterogeneity of recorded precipitation changes in sign, although data-model comparison suggests that the simulated dynamic wetting mechanism is too weak relative to the thermodynamic drying mechanism over data-model disagreement regions. Article in Journal/Newspaper Ice Sheet Springer Nature (via Crossref) Climate Dynamics 56 3-4 1303 1316 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
Atmospheric Science |
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Atmospheric Science Sun, Yong Wu, Haibin Kageyama, Masa Ramstein, Gilles Li, Laurent Z. X. Tan, Ning Lin, Yating Liu, Bo Zheng, Weipeng Zhang, Wenchao Zou, Liwei Zhou, Tianjun The contrasting effects of thermodynamic and dynamic processes on East Asian summer monsoon precipitation during the Last Glacial Maximum: a data-model comparison |
topic_facet |
Atmospheric Science |
description |
Abstract The Last Glacial Maximum (LGM; 21 ka BP) was the most recent glacial period when the global ice sheet volume was at a maximum. Therefore, the LGM can be used to investigate atmospheric dynamics under a climate that differed significantly from the present. This study quantitatively compares pollen records of boreal summer (June–July–August) precipitation with the PMIP3 LGM simulations. The data-model comparison shows an overall agreement on a drier than pre-industrial East Asian summer monsoon (EASM) climate. Nevertheless, 17 out of 55 records show a regional precipitation increase that is also simulated over the additional land mass area due to sea level drop. The thermodynamic and dynamic responses are analyzed to explain a drier LGM EASM as a combination of these two antagonistic mechanisms. Relatively low atmospheric moisture content was the main thermodynamic control on the lower LGM (relative to pre-industrial levels) EASM precipitation amounts in both the reconstructions and the models. In contrast, two dynamic processes in relation to stationary eddy activity act to increase EASM precipitation regionally in records and simulations, respectively. Precipitation increase in records is explained by dynamic enhancement of the horizontal moisture transport, while dynamic enhancement of the vertical moisture transport leads to simulated precipitation increase over the specific region where landmass was exposed during LGM along continental coastlines of China due to significant drop in sea level (relative to pre-industrial levels). Overall, the opposing effects of thermodynamic and dynamic processes on precipitation during the LGM provide a means to reconcile the spatial heterogeneity of recorded precipitation changes in sign, although data-model comparison suggests that the simulated dynamic wetting mechanism is too weak relative to the thermodynamic drying mechanism over data-model disagreement regions. |
author2 |
International Cooperation and Exchange Programme State Key Laboratory of Drug Research National Key Research and Development Program of China Ministry of Science and Technology of the People's Republic of China National Natural Science Foundation of China The Second Tibetan Plateau Scientific Expedition and Research (STEP) program |
format |
Article in Journal/Newspaper |
author |
Sun, Yong Wu, Haibin Kageyama, Masa Ramstein, Gilles Li, Laurent Z. X. Tan, Ning Lin, Yating Liu, Bo Zheng, Weipeng Zhang, Wenchao Zou, Liwei Zhou, Tianjun |
author_facet |
Sun, Yong Wu, Haibin Kageyama, Masa Ramstein, Gilles Li, Laurent Z. X. Tan, Ning Lin, Yating Liu, Bo Zheng, Weipeng Zhang, Wenchao Zou, Liwei Zhou, Tianjun |
author_sort |
Sun, Yong |
title |
The contrasting effects of thermodynamic and dynamic processes on East Asian summer monsoon precipitation during the Last Glacial Maximum: a data-model comparison |
title_short |
The contrasting effects of thermodynamic and dynamic processes on East Asian summer monsoon precipitation during the Last Glacial Maximum: a data-model comparison |
title_full |
The contrasting effects of thermodynamic and dynamic processes on East Asian summer monsoon precipitation during the Last Glacial Maximum: a data-model comparison |
title_fullStr |
The contrasting effects of thermodynamic and dynamic processes on East Asian summer monsoon precipitation during the Last Glacial Maximum: a data-model comparison |
title_full_unstemmed |
The contrasting effects of thermodynamic and dynamic processes on East Asian summer monsoon precipitation during the Last Glacial Maximum: a data-model comparison |
title_sort |
contrasting effects of thermodynamic and dynamic processes on east asian summer monsoon precipitation during the last glacial maximum: a data-model comparison |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
http://dx.doi.org/10.1007/s00382-020-05533-7 http://link.springer.com/content/pdf/10.1007/s00382-020-05533-7.pdf http://link.springer.com/article/10.1007/s00382-020-05533-7/fulltext.html |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Climate Dynamics volume 56, issue 3-4, page 1303-1316 ISSN 0930-7575 1432-0894 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00382-020-05533-7 |
container_title |
Climate Dynamics |
container_volume |
56 |
container_issue |
3-4 |
container_start_page |
1303 |
op_container_end_page |
1316 |
_version_ |
1766031974152011776 |