摘要
对2009年8月19～20日沈阳地区出现的一次区域性暴雨天气进行分析,结果表明,此次降水的环流形势为典型的副热带高压与西风槽相迎合的暴雨天气形势;地面气旋发展的辐合作用和锋面的抬升作用是这次暴雨产生的触发机制;中低空急流的耦合配置为对流发展创造了有利条件,同时2支急流为这次暴雨天气提供了源源不断的水汽输送;K指数分布、500和700hPa的总温度场和假相当位温场对于降水量的预报有一定的指示意义;日本传真图和MM5对此次降水量预报把握较好。
The analysis of ＇09.08.19 ＇regional rainstorm weather in Shenyang showed that the circulation situation of the rainfall was the typical subtropical high pressure with westerly trough. Surface cyclone development in cooperation with the convergence and the role of the front of the uplift produced by the heavy rains trigger mechanism. The coupling configuration of low-level jet created favorable conditions for the development of convection,while the two rapids provided a steady stream of water vapor transport for the heavy rainfall. K exponential distribution,500 hPa,700 hPa temperature field and the total pseudo-equivalent potential temperature for the precipitation forecasts have a certain direction meaning. Japan fax map and MM5 grasped the precipitation forecasts better.
出处
《安徽农业科学》
CAS
北大核心
2010年第9期4665-4668,共4页
Journal of Anhui Agricultural Sciences
关键词
西风槽
副高北边缘
急流
K指数
总温度场
假相当位温场
Westerly trough
Northern edge of subtropical high
Jet stream
K index
Total temperature field
Pseudo-equivalent potential temperature
