THE MODELING STUDY OF DOWNBURST  

作　　者：许焕斌 魏绍远 

机构地区：[1]Beijing Institute of Applied Meteorology,Beijing 100029 [2]Air Force Institute of Meteorology,Nanjing 211101

出　　处：《Acta meteorologica Sinica》1996年第1期108-117,共10页

基　　金：The project is supported by the National Natural Science Foundation of China

摘　　要：Downburst is a very dangerous weather phenomenon for aeroplane taking off or landing. In order to understand the initial formation and evolution of downburst and to study the effects of at- mospheric environment condition and the microstructure of cloud-precipitation particles on the downburst development processes, we have designed and carried out a modeling scheme by making use of our own non-hydrostatic compressible mesoscale-γ model including necessary cloud-precipi- tation processes. The initial conditions of temperature, humidity and wind are from an observation case in which the downburst occurred. The results of computations demonstrate the evolution of downburst and show the variation of various environmental and microphysical parameters. Some of the mechanisms about the downburst occurrence have been obtained. Computation results may help airport forecasters to determine the occurrence of downburst better.Downburst is a very dangerous weather phenomenon for aeroplane taking off or landing. In order to understand the initial formation and evolution of downburst and to study the effects of at- mospheric environment condition and the microstructure of cloud-precipitation particles on the downburst development processes, we have designed and carried out a modeling scheme by making use of our own non-hydrostatic compressible mesoscale-γ model including necessary cloud-precipi- tation processes. The initial conditions of temperature, humidity and wind are from an observation case in which the downburst occurred. The results of computations demonstrate the evolution of downburst and show the variation of various environmental and microphysical parameters. Some of the mechanisms about the downburst occurrence have been obtained. Computation results may help airport forecasters to determine the occurrence of downburst better.

关 键 词：DOWNBURST numerical modeling microstructure of cloud-precipitation 

分 类 号：P427.32[天文地球—大气科学及气象学]