摘要
文章运用新近开发的双向嵌套的ＭＭ５中尺度模式，在国家气象中心的ＣＲＡＹ－Ｃ９２巨型机环境下，对１９９６年４月中旬末的华南暴雨过程进行了高分辨率数值模拟和敏感性试验．结果表明，该模式比较成功地模拟了这次暴雨过程及相关的中尺度系统的发生发展；凝结潜热通过一个类似于ＣＩＳＫ的机制对暴雨过程的发生发展产生了至关重要的作用；低空西南急流为暴雨的发生发展输送了潜在不稳定能量，并在与暴雨的相互作用中得以维持和加强；初始时刻（暴雨发生前１２小时）南海北部—华南地区低层潜在不稳定能量的储备是暴雨发生不可缺少的条件．
The earliest torrential rain event over South China in 1996 is simulated, and a series of sensitivity experiments are carried out using a nested grid version of PSU/NCAR′s mesoscale model (MM5) with a fine mesh grid size of 20 km. It is shown that the MM5 model reproduces successfully the development of the torrential rain and mesoscale system; latent heat release acts a vital role in the development of the torrential rain event by a mechanism similar to CISK; the low level southwest jet transports potential unstable energy to the torrential rain region, and interacts with torrential rain to maintain and strengthen itself; the store of the low level potential unstable energy over the South China Sea and the South China region at initial time(12 h before the occurrence of the torrential rain) is a crucial condition for the formation of the torrential rain.
出处
《应用气象学报》
CSCD
北大核心
1997年第3期257-268,共12页
Journal of Applied Meteorological Science
基金
国家自然科学基金
关键词
暴雨
中尺度系统
数值模拟
物理机制
降水分析
Torrential rain Mesoscale system Numerical simulation Physical mechanism
