Dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon
The effect of ice sheet topography on the East Asian summer monsoon (EASM) during the Last Glacial Maximum is studied using CCSM3 in a hierarchy of model configurations. It is found that receding ice sheets result in a weakened EASM, with the reduced ice sheet thickness playing a major role. The low...
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American Meteorological Society
2020
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ftulundlup:oai:lup.lub.lu.se:4b1edf3f-340e-43cd-813f-b2b6ce9404d4 2023-05-15T16:39:57+02:00 Dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon Gao, Yu Liu, Zhengyu Lu, Zhengyao 2020 https://lup.lub.lu.se/record/4b1edf3f-340e-43cd-813f-b2b6ce9404d4 https://doi.org/10.1175/JCLI-D-19-0562.1 eng eng American Meteorological Society https://lup.lub.lu.se/record/4b1edf3f-340e-43cd-813f-b2b6ce9404d4 http://dx.doi.org/10.1175/JCLI-D-19-0562.1 scopus:85090038571 Journal of Climate; 33(16), pp 6929-6944 (2020) ISSN: 0894-8755 Meteorology and Atmospheric Sciences contributiontojournal/article info:eu-repo/semantics/article text 2020 ftulundlup https://doi.org/10.1175/JCLI-D-19-0562.1 2023-02-01T23:40:04Z The effect of ice sheet topography on the East Asian summer monsoon (EASM) during the Last Glacial Maximum is studied using CCSM3 in a hierarchy of model configurations. It is found that receding ice sheets result in a weakened EASM, with the reduced ice sheet thickness playing a major role. The lower ice sheet topography weakens the EASM through shifting the position of the midlatitude jet, and through altering Northern Hemisphere stationary waves. In the jet shifting mechanism, the lowering of ice sheets shifts the westerly jet northward and decreases the westerly jet over the subtropics in summer, which reduces the advection of dry enthalpy and in turn precipitation over the EASM region. In the stationary wave mechanism, the lowering of ice sheets induces an anomalous stationary wave train along the westerly waveguide that propagates into the EASM region, generating an equivalent-barotropic low response; this leads to reduced lower-tropospheric southerlies, which in turn reduces the dry enthalpy advection into East Asia, and hence the EASM precipitation. Article in Journal/Newspaper Ice Sheet Lund University Publications (LUP) Journal of Climate 33 16 6929 6944 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Meteorology and Atmospheric Sciences |
spellingShingle |
Meteorology and Atmospheric Sciences Gao, Yu Liu, Zhengyu Lu, Zhengyao Dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon |
topic_facet |
Meteorology and Atmospheric Sciences |
description |
The effect of ice sheet topography on the East Asian summer monsoon (EASM) during the Last Glacial Maximum is studied using CCSM3 in a hierarchy of model configurations. It is found that receding ice sheets result in a weakened EASM, with the reduced ice sheet thickness playing a major role. The lower ice sheet topography weakens the EASM through shifting the position of the midlatitude jet, and through altering Northern Hemisphere stationary waves. In the jet shifting mechanism, the lowering of ice sheets shifts the westerly jet northward and decreases the westerly jet over the subtropics in summer, which reduces the advection of dry enthalpy and in turn precipitation over the EASM region. In the stationary wave mechanism, the lowering of ice sheets induces an anomalous stationary wave train along the westerly waveguide that propagates into the EASM region, generating an equivalent-barotropic low response; this leads to reduced lower-tropospheric southerlies, which in turn reduces the dry enthalpy advection into East Asia, and hence the EASM precipitation. |
format |
Article in Journal/Newspaper |
author |
Gao, Yu Liu, Zhengyu Lu, Zhengyao |
author_facet |
Gao, Yu Liu, Zhengyu Lu, Zhengyao |
author_sort |
Gao, Yu |
title |
Dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon |
title_short |
Dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon |
title_full |
Dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon |
title_fullStr |
Dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon |
title_full_unstemmed |
Dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon |
title_sort |
dynamic effect of last glacial maximum ice sheet topography on the east asian summer monsoon |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://lup.lub.lu.se/record/4b1edf3f-340e-43cd-813f-b2b6ce9404d4 https://doi.org/10.1175/JCLI-D-19-0562.1 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Journal of Climate; 33(16), pp 6929-6944 (2020) ISSN: 0894-8755 |
op_relation |
https://lup.lub.lu.se/record/4b1edf3f-340e-43cd-813f-b2b6ce9404d4 http://dx.doi.org/10.1175/JCLI-D-19-0562.1 scopus:85090038571 |
op_doi |
https://doi.org/10.1175/JCLI-D-19-0562.1 |
container_title |
Journal of Climate |
container_volume |
33 |
container_issue |
16 |
container_start_page |
6929 |
op_container_end_page |
6944 |
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1766030308257300480 |