摘要
结合 1 991年 7月 5日 2 0时至 6日 2 0时一次典型的江淮梅雨锋暴雨过程实况资料 ,系统、细致地比较分析了实时分析的湿 Q矢量散度场与同时次改进后的MM4(MMM4)模式实时分析输出场之间的差异。结果表明 :在整个梅雨锋暴雨过程中 ,湿 Q矢量散度辐合场与同时刻地面雨区之间的对应关系较 ω场优越 ;70 0 h Pa湿Q矢量散度辐合区对同时刻地面降水场有指示作用 ,尤其在梅雨锋暴雨的发展阶段及强盛时期 ,它对实际降水的落区及强度指示作用更为明显 ;
The differences between wet Q vector divergence field(WQVDF) and ω field from the modified MM4 model are examined in details by the use of data concerning a typical Meiyu front heavy rainfall in Jiang-Huai Basins during 5—6 July 1991. The results show that WQVDF convergence is more closely associated with the precipitation than ω field throughout the rainstorm; the 700hPa convergence field has indication to the surface rainfall on a synchronous basis, especially in the developing and developed stages, which serves as a better indicator to the fallout area and intensity of precipitation;the calculating scheme of vertical velocity involved in the MMM4 model needs to be further improved.
出处
《南京气象学院学报》
CSCD
北大核心
2002年第3期420-424,共5页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金项目 4 9775 2 5 9
国家自然科学基金项目 4 0 0 75 0 0 9
关键词
湿Q矢量散度场
ω场
比较分析
梅雨锋暴雨
MMM4模式
降水场
wet Q vector divergence field
ω field
comparison and analysis
Meiyu front rainstorm
modified MMM4 model
