| ONSET AND RETREAT DATES OF THE SOUTH CHINA SEA SUMMER MONSOON AND THEIR
RELATIONSHIPS WITH THE MONSOON INTENSITY IN THE CONTEXT OF CLIMATE WARMING |
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| 作者姓名： | 李栋梁 蒋元春 张莉萍 王 慧 李 潇 |
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| 作者单位： | College of Atmospheric Science, Nanjing University of Information Science &
Technology / Collaborative Innovation Center on Forecast and Evaluation of
Meteorological Disasters / Key Laboratory of Meteorological Disaster, Ministry of
Education, Nanjing |
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| 摘 要： | 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 area110-120°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.
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| 关 键 词： | climate warming South China Sea summer monsoon onset and retreat dates cross-equatorial flow |
| 修稿时间： | 2016/5/20 0:00:00 |
ONSET AND RETREAT DATES OF THE SOUTH CHINA SEA SUMMER MONSOON AND THEIR
RELATIONSHIPS WITH THE MONSOON INTENSITY IN THE CONTEXT OF CLIMATE WARMING |
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| LI Dong-liang,JIANG Yuan-chun,ZHANG Li-ping,WANG Hui and LI Xiao.ONSET AND RETREAT DATES OF THE SOUTH CHINA SEA SUMMER MONSOON AND THEIR
RELATIONSHIPS WITH THE MONSOON INTENSITY IN THE CONTEXT OF CLIMATE WARMING[J].Journal of Tropical Meteorology,2016,22(3):362-373. |
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| Authors: | LI Dong-liang JIANG Yuan-chun ZHANG Li-ping WANG Hui and LI Xiao |
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| Institution: | College of Atmospheric Science, Nanjing University of Information Science &
Technology / Collaborative Innovation Center on Forecast and Evaluation of
Meteorological Disasters / Key Laboratory of Meteorological Disaster, Ministry of
Education, Nanjing |
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| Abstract: | 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 area110-120°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. |
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| Keywords: | climate warming South China Sea summer monsoon onset and retreat dates cross-equatorial flow |
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