Impact of Stratospheric Sudden Warming on East Asian Winter Monsoons
Fifty-two Stratospheric sudden warming (SSW) events that occurred from 1957 to 2002 were analyzed based on the 40-year European Centre for Medium-Range Weather Forecasts Reanalysis dataset. Those that could descent to the troposphere were composited to investigate their impacts on the East Asian win...
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Series: | Advances in Meteorology |
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doaj-cd2f890408494a43b7676e150fe02c8e2020-11-24T22:40:45ZengHindawi LimitedAdvances in Meteorology1687-93091687-93172015-01-01201510.1155/2015/640912640912Impact of Stratospheric Sudden Warming on East Asian Winter MonsoonsQuanliang Chen0Luyang Xu1Hongke Cai2College of Atmospheric Science, Chengdu University of Information Technology and Plateau Atmospheric and Environment Laboratory of Sichuan Province, Chengdu 610225, ChinaCollege of Atmospheric Science, Chengdu University of Information Technology and Plateau Atmospheric and Environment Laboratory of Sichuan Province, Chengdu 610225, ChinaCollege of Atmospheric Science, Chengdu University of Information Technology and Plateau Atmospheric and Environment Laboratory of Sichuan Province, Chengdu 610225, ChinaFifty-two Stratospheric sudden warming (SSW) events that occurred from 1957 to 2002 were analyzed based on the 40-year European Centre for Medium-Range Weather Forecasts Reanalysis dataset. Those that could descent to the troposphere were composited to investigate their impacts on the East Asian winter monsoon (EAWM). It reveals that when the SSW occurs, the Arctic Oscillation (AO) and the North Pacific Oscillation (NPO) are both in the negative phase and that the tropospheric circulation is quite wave-like. The Siberian high and the Aleutian low are both strengthened, leading to an increased gradient between the Asian continent and the North Pacific. Hence, a strong EAWM is observed with widespread cooling over inland and coastal East Asia. After the peak of the SSW, in contrast, the tropospheric circulation is quite zonally symmetric with negative phases of AO and NPO. The mid-tropospheric East Asian trough deepens and shifts eastward. This configuration facilitates warming over the East Asian inland and cooling over the coastal East Asia centered over Japan. The activities of planetary waves during the lifecycle of the SSW were analyzed. The anomalous propagation and the attendant altered amplitude of the planetary waves can well explain the observed circulation and the EAWM.http://dx.doi.org/10.1155/2015/640912 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Quanliang Chen Luyang Xu Hongke Cai |
spellingShingle |
Quanliang Chen Luyang Xu Hongke Cai Impact of Stratospheric Sudden Warming on East Asian Winter Monsoons Advances in Meteorology |
author_facet |
Quanliang Chen Luyang Xu Hongke Cai |
author_sort |
Quanliang Chen |
title |
Impact of Stratospheric Sudden Warming on East Asian Winter Monsoons |
title_short |
Impact of Stratospheric Sudden Warming on East Asian Winter Monsoons |
title_full |
Impact of Stratospheric Sudden Warming on East Asian Winter Monsoons |
title_fullStr |
Impact of Stratospheric Sudden Warming on East Asian Winter Monsoons |
title_full_unstemmed |
Impact of Stratospheric Sudden Warming on East Asian Winter Monsoons |
title_sort |
impact of stratospheric sudden warming on east asian winter monsoons |
publisher |
Hindawi Limited |
series |
Advances in Meteorology |
issn |
1687-9309 1687-9317 |
publishDate |
2015-01-01 |
description |
Fifty-two Stratospheric sudden warming (SSW) events that occurred from 1957 to 2002 were analyzed based on the 40-year European Centre for Medium-Range Weather Forecasts Reanalysis dataset. Those that could descent to the troposphere were composited to investigate their impacts on the East Asian winter monsoon (EAWM). It reveals that when the SSW occurs, the Arctic Oscillation (AO) and the North Pacific Oscillation (NPO) are both in the negative phase and that the tropospheric circulation is quite wave-like. The Siberian high and the Aleutian low are both strengthened, leading to an increased gradient between the Asian continent and the North Pacific. Hence, a strong EAWM is observed with widespread cooling over inland and coastal East Asia. After the peak of the SSW, in contrast, the tropospheric circulation is quite zonally symmetric with negative phases of AO and NPO. The mid-tropospheric East Asian trough deepens and shifts eastward. This configuration facilitates warming over the East Asian inland and cooling over the coastal East Asia centered over Japan. The activities of planetary waves during the lifecycle of the SSW were analyzed. The anomalous propagation and the attendant altered amplitude of the planetary waves can well explain the observed circulation and the EAWM. |
url |
http://dx.doi.org/10.1155/2015/640912 |
work_keys_str_mv |
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1725703494046842880 |