ONSET AND RETREAT DATES OF THE SOUTH CHINA SEA SUMMER MONSOON AND THEIR RELATIONSHIPS WITH THE MONSOON INTENSITY IN THE CONTEXT OF CLIMATE WARMING

Global gridded daily mean data from the NCEP/NCAR Reanalysis （1948-2012） are used to obtain the onset date, retreat date and duration time series of the South China Sea summer monsoon （SCSSM） for the past 65 years. The summer monsoon onset （retreat） date is defined as the time when the mean zonal wi...

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Published inJournal of Tropical Meteorology Vol. 22; no. 3; pp. 362 - 373
Main Author 李栋梁 蒋元春 张莉萍 王慧 李潇
Format Journal Article
LanguageEnglish
Published Guangzhou Guangzhou Institute of Tropical & Marine Meteorology 01.09.2016
Subjects
Atmospheric circulation
Precipitation
Summer
Wind shear
South China Sea
China
Japan
Bay of Bengal
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Summary:Global gridded daily mean data from the NCEP/NCAR Reanalysis （1948-2012） are used to obtain the onset date, retreat date and duration time series of the South China Sea summer monsoon （SCSSM） for the past 65 years. The summer monsoon onset （retreat） date is defined as the time when the mean zonal wind at 850 hPa shifts steadily from easterly （westerly） to westerly （easterly） and the pseudo-equivalent potential temperature at the same level remains steady at greater than 335 K （less than 335 K） in the South China Sea area [l10-120~E （10-20~N）]. The clockwise vortex of the equatorial Indian Ocean region, together with the cross-equatorial flow and the subtropical high, plays a decisive role in the burst of the SCSSM. The onset date of the SCSSM is closely related to its intensity. With late （early） onset of the summer monsoon, its intensity is relatively strong （weak）, and the zonal wind undergoes an early （late） abrupt change in the upper troposphere. Climate warming significantly affects the onset and retreat dates of the SCSSM and its intensity. With climate warming, the number of early-onset （-retreat） years of the SCSSM is clearly greater （less）, and the SCSSM is clearly weakened.
Bibliography:LI Dong-liang JIANG Yuan-chun , ZHANG Li-ping , WANG Hui , LI Xiao （1. Key Laboratory of Meteorological Disaster, Ministry of Education / Joint International Research Laboratory of Climate and Environment Change / Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044 China; 2. Weihai Meteorological Bureau, Weihai, Shandong 264200 China）
climate warming; South China Sea summer monsoon; onset and retreat dates; cross-equatorial flow
44-1409/P
Global gridded daily mean data from the NCEP/NCAR Reanalysis （1948-2012） are used to obtain the onset date, retreat date and duration time series of the South China Sea summer monsoon （SCSSM） for the past 65 years. The summer monsoon onset （retreat） date is defined as the time when the mean zonal wind at 850 hPa shifts steadily from easterly （westerly） to westerly （easterly） and the pseudo-equivalent potential temperature at the same level remains steady at greater than 335 K （less than 335 K） in the South China Sea area [l10-120~E （10-20~N）]. The clockwise vortex of the equatorial Indian Ocean region, together with the cross-equatorial flow and the subtropical high, plays a decisive role in the burst of the SCSSM. The onset date of the SCSSM is closely related to its intensity. With late （early） onset of the summer monsoon, its intensity is relatively strong （weak）, and the zonal wind undergoes an early （late） abrupt change in the upper troposphere. Climate warming significantly affects the onset and retreat dates of the SCSSM and its intensity. With climate warming, the number of early-onset （-retreat） years of the SCSSM is clearly greater （less）, and the SCSSM is clearly weakened.
ISSN:1006-8775
DOI:10.16555/j.1006-8775.2016.03.010