Authors: Peng Liu Yongfu Qian Anning Huang
Publish Date: 2009/05/08
Volume: 26, Issue: 3, Pages: 493-502
Abstract
The present study analyzes the differences in spatial and temporal variations of surface temperatures between early and late onset years of the South China Sea summer monsoon SCSSM It is found that when the land surface temperature north of 40°N is lower higher and the sea surface temperature over the South China Seawestern North Pacific SCSWNP is higher lower in winter the onset of the SCSSM begins earlier later When the land surface temperature north of 40°N is higher lower and the sea surface temperature over the SCSWNP is lower higher in spring the onset of the SCSSM occurs earlier later The reason why the anomalies of the land surface temperatures north of 40°N can influence the atmospheric circulation is investigated by analysis of the wind and temperature fields In order to verify the mechanisms of influence over the land and sea surface temperature distribution patterns and test the ability of the pσ regional climate model pσ RCM9 to simulate the SCSSM onset three types of years with early normal and late SCSSM onset are selected and the SCSSM regimes are numerically simulated According to the results obtained from five sensitive experiments when the land surface temperature is higher in the eastern part north of 40°N and lower in the western part north of 40°N and it rises faster in the eastern coastal regions and the Indian Peninsula while the sea surface temperatures over the SCSWNP are lower the early onset of the SCSSM can be expected
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