摘要
利用南昌探空和地面观测资料,对2008年1月20日—31日南昌大气垂直温湿场进行了分析。结果表明,逆温层中冷、暖层的变化以及中低层湿度的变化是影响冻雨天气出现的重要因素。逆温层中暖层增温,以及暖层下冷层的加强,是冻雨天气发生发展的重要因素;逆温层中暖层的减弱以及冷层的加强,可导致冻雨天气减弱或结束。中低层维持深厚高湿环境也是冻雨天气出现与维持的一个重要条件;深厚高湿环境的破坏、低层湿度的减小,是导致冻雨天气减弱或结束的重要因素。
Based on the data of sounding and surface observation from Nanchang station, the atmospheric vertical temperature and humidity fields of Nanchang during January 20 to 31, 2008 are analyzed. The results indicate that the changes of cold and warm levels in the inversion layer and the change of low-middle humidity are the main factors which generate freezing rain. In the inversion layer, the temperature increase in the warm level and the strengthening of the lower cold level are the reasons for freezing rain development, and the temperature decrease in the warm level and the strengthening of the lower cold level result in weakening or even finishing freezing rain. The persistent deep and humid low-middle layer is also the important condition for freezing rain. The destruction of the deep and humid environment and the decrease of humidity at the lower layer cause the freezing rain to weaken or end.
出处
《气象与减灾研究》
2008年第4期69-72,共4页
Meteorology and Disaster Reduction Research
关键词
冻雨
逆温层
湿度
Freezing rain, Inversion layer, Humidity.
