摘要
在完全考虑非绝热加热项潜热作用的前提下,从原始方程出发,推导出改进后的湿Q矢量(以下记为Q^M)的表达式以及用其散度作强迫项的ω方程,并结合一次梅雨锋暴雨天气过程将改进前、后的湿Q矢量诊断能力进行比较,结果发现:(1)改进后的湿Q矢量对同时刻的地面降水的反映能力较原湿Q矢量(Q~*)有显著的提高。(2)在整个梅雨锋暴雨过程中,600 hPa高度上的改进后的湿Q矢量散度辐合场的辐合强度及其辐合中心的位置对同时刻的地面实际降水的强度及雨区位置都有非常好的指示作用。
With non-adiabatic latent heating completely considered and based on a primitive equation, derived are an expression of the modified wet Q vector (Q*)(hereafter termed QM) and a non-geostrophic ω equation wherein the QM divergence is taken as a forcing term with a diagnosis comparison of QM to Q* in the context of a Meiyu front synoptic process. The results show that (1) the ability of reflecting synchronous precipitation of QM is enhanced significantly in contrast to Q*; (2) the convergence intensity and center of 600 hPa QM divergence field are good indicators to the counterparts of precipitation throughout the rainstorm.
出处
《热带气象学报》
CSCD
北大核心
2003年第3期308-316,共9页
Journal of Tropical Meteorology
基金
国家自然科学基金项目40075009和4O205008共同资助
关键词
湿Q矢量
改进后的湿Q矢量
改进
梅雨锋暴雨
wet Q vector
modified wet Q vector
improvement
Meiyu front rainstorm
