摘要
该文根据河北省常规地面观测资料和北京站、张家口站的探空资料,分析了此次冻雨过程的温湿结构特征,并且利用WRF中尺度数值模式,结合NCEP再分析资料,对此次冻雨天气过程进行了数值模拟。结果表明张家口上空的降水云系的云顶高度约为1.5km,云顶温度为-10℃,降水是以雪的形式降落的;然而,发生在北京地区的冻雨过程的云顶高度约为1.5 km,降水云系云顶温度约为-2℃,整个云体温度在-2^-8℃,云层中的部分水是以过冷却水的形式降落到0℃以下的地面物体上,形成冻雨,且为暖雨机制。
In this article, I analysis the structural characteristics of this freezing precipitation in temperature and humidity,based on conventional surface meteorological observation data and air sounding data of Beijing station and Zhangjiakou sta-tion. And I simulate this freezing precipitation case with WRF model combining with NCEP reanalysis data. The results show that cloud top height for Zhangjiakou is about 1.5km, and cloud top temperature is about-10 ℃, precipitation is landing in the form of snow. However, cloud top height for Beijing is about 1.5km, but, cloud top temperature is about-2 ℃. Furthermore the entire cloud body temperature is between-2° to-8 ℃,part of precipitation landing in the form of cooling water to the ground objects whose temperature is below 0 ℃, Forming a freezing precipitation, which is warm rain process.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第S1期441-444,463,共5页
Environmental Science & Technology
关键词
WRF模式
数值模拟
冻雨
暖雨机制
WRF model
simulation
freezing precipitation
warm rain process
