摘要
１９９４年南海夏季风建立于５月第一候，利用ＭＭ５成功地模拟了这一过程，并通过敏感性试验，讨论了中纬度系统和中南半岛及其附近地区的积云对流对夏季风环流建立的影响，结果表明：（１）南下接近副热带一定强度的中纬度槽－锋系统的强迫，可引起南海地区副热带高压脊的减弱东撤。因而有利于南海夏季风的建立；（２）东移的中纬度高压脊与南亚高压的同相叠加是触发夏季风建立的重要因子之一，它引起南亚高压中心迅速北移至中南半岛的北部；（３）中南半岛及其附近地区的积云对流加热，对南海地区夏季风环流的建立也有重要的影响。
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.
出处
《大气科学》
CSCD
北大核心
2001年第4期455-464,共10页
Chinese Journal of Atmospheric Sciences
基金
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
关键词
南海
夏季风
积云对流参数化
中纬度槽-锋系统
数值模拟
1994年
South China Sea
summer monsoon
numerical simulation, middle latitude trouth-front system
convective parameterization
