一次沙尘暴过程锋生函数和地表热通量的数值诊断  

Simulating Diagnostic Analyses for Frontogenesis and Surface Sensible Heat Flux of a Sand-Dust Storm Process

作　　者：孙军 姚秀萍[2] 

机构地区：[1]国家气象中心,北京100081 [2]北京气象学院,北京100081

出　　处：《高原气象》2002年第5期488-494,共7页Plateau Meteorology

基　　金：国家气象中心 (ZX95 0 2 )课题资助

摘　　要：沙尘暴是我国西北地区春季常发生的一种灾害性天气现象。本文利用国家气象中心改进的PSU/NCAR的非静力中尺度模式MM5 ,对 1995年 5月 16日我国西北地区发生的一次沙尘暴天气个例进行了锋生函数和地表热通量的诊断分析。结果表明 ,沙尘暴过程是冷锋在移至我国西北地区时产生的一种强烈锋生过程 ;地表感热通量明显大于地表潜热通量 ;有无地面热通量对比试验表明 ,热力因子在沙尘暴产生过程中具有重要作用。The sand and dust storm is a disastrous weather phenomenon which often occurs in the northwest of China spring. The diagnostic analysis of a sand-dust storm case, which occurred on 16 May 1995, is studied by using of the PSU/NCAR non-hydrostatic mesoscale model MM5 improved by NMC. The results show that the dust storm is a process of strong frontogenesis when the cold front move to the northwest China region. The sensible heat flux is very greater than the latent heat flux in the PBL air. The case study also indicates that the thermal factor play an important role on the producing process of the dust storm through removing the surface flux from the MM5.

关 键 词：沙尘暴 锋生 强风 沙源 热力不稳定 数值模拟 感热通量 潜热通量 

分 类 号：P445.4[天文地球—大气科学及气象学] P425.