摘要
利用国家气象中心高分辨率有限区域业务预报模式（ＨＬＡＦＳ），对有无下曳气流的积云参数化方案进行了对比试验，通过对积云内各物理量及大尺度物理量场的诊断分析研究下曳气流对积云对流发生发展的作用以及对大尺度热力、动力场的影响。结果表明：（１）下曳气流具有湿冷的特征，主要出现在强对流时段对流层中下层；（２）下曳气流的引入，促进了模式中强积云对流的发生发展，并在更高更多的空间层次上更强地加热及干化环境大气，进而改变了积云对流对大尺度热力场。
By using a high resolution limited area operational forecasting model,the comparative forecasting experiments were performed to study the role of downdrafts in cumulus convection. The main conclusions are as follows:(1)Being relatively cool and moist, downdraft occurs mainly in middle and lower troposphere below 500 hPa during the period of deep convection development.(2)The downdrafts introdued have promoted the formation and development of deep cumulus clouds, which tend to warm and dry the cumulus environment more strongly at higher and more spatial levels. Consequently, the contributions of cumulus clouds to the large scale environment thermodynamic and dynamic fields are modified.
出处
《气象》
CSCD
北大核心
1999年第11期9-14,共6页
Meteorological Monthly
