摘要
应用常规观测资料和1°×1°的NCEP资料,对2008年1月中旬河南出现的一次冻雨天气过程的环流形势和影响系统的演变及气温垂直分布特征的分析结果表明:中层西南暖湿气流叠加在华北入侵强冷空气之上非常有利于冻雨天气的产生。因此,冷、暖、冷的大气温度垂直结构特征和中层暖平流的活动是冻雨产生、维持的必要条件;冻雨强度和地面的温、风、湿及降水强度均有密切的关系。
By using conventional observation data and the 1° × 1° NCEP reanalysis data, the freezing rain occurred in Henan in mid -January of 2008 is analyzed from the following aspects： circulation situation, influence system, the temperature vertical distribution and so on. The result shows it is beneficial to the generation of freezing rain that the strong cold air from North China and the SW warm and wet flow above which is in middle level. Therefore, the essential conditions of the formation, maintenance of the freezing rain are the vertical structure characteristic of the temperature distributed by cold, warm, cold from low level to high level and the warm advection in middle level. At same time, there is a close relationship between the intensity of freezing rain and the temperature, wind, humidity and precipitation intensity in the ground.
出处
《气象与环境科学》
2008年第4期36-39,共4页
Meteorological and Environmental Sciences
关键词
冻雨
冷空气
温度平流
物理量诊断
freezing rain
cold air
temperature advection
physical diagnosis
