摘要
利用美国PSU/NCAR的MM5V3中尺度非静力模式,对发生在2002年12月22—23日华北平原的一次回流天气过程进行了数值试验。结果发现:来自东北平原的低层冷空气虽然经渤海侵入华北平原,但仍然保持干冷气团的特性,在降水中起“冷垫”作用。降水的起止时间与中高层暖湿气流和低层干冷空气的风向相关较好;降水强度的变化与风速的大小成正相关。伴随西南暖湿气流,华北回流降水的水汽来自南方。
By use of the meso-scale non-hydrostatic model MM5 （ V3 ） , and the observational data and T213 output data,we simulate and analyze the backflow precipitation over North China on Dec. 22-23, 2002. The results show that the lower level Northeast airflow was dry and cold, and it acted as a cold wedge ; the start and end time of precipitation were closely correlated to the wind direction, including the upper warm air flow and lower cold air flow;and the precipitation strength was correlated to the wind speed. The moisture came from the South along with the south-west air flow.
出处
《南京气象学院学报》
CSCD
北大核心
2006年第1期107-113,共7页
Journal of Nanjing Institute of Meteorology
基金
河北省气象局项目"华北平原回流天气的结构特征研究"
关键词
回流天气
中尺度模式
冷垫
backflow precipition
mesoscale model
cold wedge
