Atmospheric Circulation Cells Associated with Anomalous East Asian Winter Monsoon |
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Authors: | ZENG Gang Wei-Chyung WANG SUN Zhaobo and LI Zhongxian |
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Institution: | Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Atmospheric Sciences Research Center, State University of New York at Albany, Albany 12203, USA,Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044,Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044 |
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Abstract: | Atmospheric circulation cells associated with anomalous East Asian Winter
Monsoon (EAWM) were studied using the 1948/49 to 2002/03 NCEP/NCAR
reanalysis and NCAR CAM3 AGCM simulations with monthly global sea surface
temperatures from 1950 to 2000. Several atmospheric cells in the Pacific
i.e., the zonal Walker cell (ZWC) in the tropic, the Hadley cell in the
western Pacific (WPHC), the midlatitude zonal cell (MZC) over the central
North Pacific, and the Hadley cell in the eastern Pacific (EPHC)] are
associated with anomalous EAWM. When the EAWM is strong, ZWC, WPHC, and MZC
are enhanced, as opposed to EPHC. The anomalous enhanced ZWC is
characterized by air parcels rising in the western tropical Pacific, flowing
eastward in the upper troposphere, and descending in the tropical central
Pacific before returning to the tropical western Pacific. The enhanced MZC
has characteristics opposite those of the enhanced ZWC in the central North
Pacific. The anomalous WPHC shows air parcels rising in the western Pacific,
as in the case of ZWC, followed by flowing northward in the upper
troposphere and descending in the west North Pacific, as in the case of the
enhanced MZC before returning to the western tropical Pacific. The anomalous
EPHC is opposite in properties to the anomalous WPHC. Opposite
characteristics are found during the weak EAWM period. The model simulations
and the observations show similar characteristics and indicate the important
role of sea surface temperature. A possible mechanism is proposed to link
interannual variation of EAWM with the central-eastern tropical Pacific sea
surface temperature anomaly (SSTA). |
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Keywords: | East Asian winter monsoon zonal Walker cell Hadley cell midlatitude zonal cell sea surface temperature anomaly |
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