摘要
下击暴流是危害飞行安全的一种重要天气现象，特别是尺度为１—４ｋｍ的微下击暴流。为了了解下击暴流的发展过程，以及大气环境条件和云－降水微物理结构对下击暴流发生演变的影响，利用我们设计发展的非静力全弹性中尺度－γ模式，以一次发生了下击暴流的大气的温、湿、风实测资料为算例进行了数值模拟研究。计算结果给出了下击暴流发生发展的过程，以及在发展过程中各种物理量的变化，得出一些大气环境条件及水凝物粒子微结构对下击暴流发展的影响机理，有助于台站预报员掌握这种天气现象的出现和演变。
ewnburst is a very dangerous weather phenomenon for aeroplane flying in or flying off the airport. In order to understand the initial formation and evolution of downburst and to study the effects of atmospheric environment condition and the microstructure of cloudprecipitation particles on the downburst development processes, we have designed and carryed out a modeling scheme by use of our own unhydrostatic compressible mesoscale-γ model including necessary cloud-precipitation processes. The initial condition of temperature, humidity and wind is from aobservation case on which the downburst occurred. The results of computations demonstrated the evolution of downburst and showed the variation of various environmental and microphysical parameters. Some of the mechanism about the downburst occurrence have been obtained. All the statements may be help the forecastor working in airport to manage the occurrence of downburst better.
出处
《气象学报》
CSCD
北大核心
1995年第2期168-176,共9页
Acta Meteorologica Sinica
基金
国家自然科学基金
关键词
下击暴流
数值模拟
云
降水
微物理结构
气流
Downburst
Numerical modeling
Microstructure of cloud-precipitation.
