A Numerical Study of the Onset of the South China Sea Summer Monsoon of 1994

Wu Chisheng and Wang Anyu (Department of Atmospheric Science, Zhongshan University, Guangzhou 510275) Fong Soikun and Ku Chimeng (Geophysical and Meteorological Observatory, Macau)  

Using the NCAR data and the PSU/ NCAR's mesoscale model (MMS), the summer monsoon onset over the South China Sea in 1994 is simulated, and a series of sensitivity experiments are carried out. The numerical experiment results show:(1) The MM5 successfully reproduces the evolution of the monsoon onset. (2) The equatorward movement of a middle latitude trough-front system into the South China may give rise to the retreating eastward of the subtropical high ridge over the South China Sea. In consequence, it is benificial to the establishment of the South China Sea summer monsoon. (3) In the upper troposphere, when the high pressure ridge in the middle westerlies moves near the longitude of the South Asian High, the South Asian High northward advances and its center rapidly moves from 16°N to the northern part of the Indochina Peninsula. It is obvious that the movement of the South Asian High has close relationship with the South China Sea summer onset. (4) The convective heating over the Indochina Peninsula and its neighbouring regions also has important effect on the South China Sea summer monsoon onset.

【Fund】： 国家自然科学基金资助项目49675264;; 科技部攀登A项目“南海季风试验研究”共同资助
【CateGory Index】： P425.42

Download(CAJ format) Download(PDF format)

CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.