The Relationship of Land-Ocean Thermal Anomaly Difference
with Mei-yu and South China Sea Summer Monsoon |
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Authors: | WANG Zhifu and QIAN Yongfu |
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Institution: | Department of Atmospheric Sciences, Nanjing University, Nanjing 210093;
Key Laboratory of Meteorological Disaster of Ministry of Education,
Nanjing University of Information Science $\&$ Technology, Nanjing 210044;Department of Atmospheric Sciences, Nanjing University, Nanjing 210093 |
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Abstract: | Based on the NCEP/NCAR reanalysis data for the period of 1948--2004 and the monthly rainfall
data at 160 stations in China from 1951 to 2004, the relationships among the land-ocean temperature
anomaly difference in the mid-lower troposphere in spring (April--May), the mei-yu rainfall in the
Yangtze River-Huaihe River basin, and the activities of the South China Sea summer monsoon (SCSSM) are
analyzed by using correlation and composite analyses. Results show that a significant positive correlation
exists between mei-yu rainfall and air temperature in the middle latitudes above the western Pacific,
while a significant negative correlation is located to the southwest of the Baikal Lake. When the
land-ocean thermal anomaly difference is stronger in spring, the western Pacific subtropical high (WPSH)
will be weaker and retreat eastward in summer (June--July), and the SCSSM will be stronger and advance
further north, resulting in deficient moisture along the mei-yu front and below-normal precipitation in
the mid and lower reaches of the Yangtze River, and vice versa for the weaker difference case. The
effects and relative importance of the land and ocean anomalous heating on monsoon variability is also
compared. It is found that the land and ocean thermal anomalies are both closely related to the summer
circulation and mei-yu rainfall and SCSSM intensity, whereas the land heating anomaly is more important
than ocean heating in changing the land-ocean thermal contrast and hence the summer monsoon intensity. |
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Keywords: | land-ocean thermal anomaly difference South China Sea summer monsoon Yangtze River-Huaihe River mei-yu rainfall correlation analysis composite analysis |
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