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一次沙尘暴过程锋生函数和地表热通量的数值诊断
引用本文:孙军,姚秀萍.一次沙尘暴过程锋生函数和地表热通量的数值诊断[J].高原气象,2002,21(5):488-494.
作者姓名:孙军  姚秀萍
作者单位:1. 国家气象中心,北京,100081
2. 北京气象学院,北京,100081
基金项目: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。

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
文章编号:1000-0534(2002)05-0488-07
修稿时间:2001年4月9日

Simulating Diagnostic Analyses for Frontogenesis and Surface Sensible Heat Flux of a Sand-Dust Storm Process
SUN Jun ,YAO Xiu-ping.Simulating Diagnostic Analyses for Frontogenesis and Surface Sensible Heat Flux of a Sand-Dust Storm Process[J].Plateau Meteorology,2002,21(5):488-494.
Authors:SUN Jun  YAO Xiu-ping
Institution:SUN Jun 1,YAO Xiu-ping 2
Abstract: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.
Keywords:Sand-dust storm  frontogenesis  Strong wind  Dust source  Thermal unstability  Numerical simulation  Sensible heat flux  Latent heat flux
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