摘要
利用NCEP的全球数据同化系统(GDAS)1°×1°分析资料、NOAA的2.5°×2.5°全球格点资料和气象观测资料等,对2010年2月24日沈阳地区大范围冻雨灾害天气过程进行分析。结果表明:冻雨发生前期,沈阳地区的明显增温是导致大范围雨雪冰冻灾害的主要原因;925—750 hPa存在的t≥0℃温厚暖层是冻雨形成的必要条件;西南气流的建立有利于大量暖湿空气向东北地区输送,并决定了低温冰冻灾害发生的区域。中层温厚暖层的建立与破坏时间对冻雨的预报具有一定的指示意义。
Based on 1° × 1° global data assimilation system（GDAS） data from NCEP,2.5°×2.5° global grid data from NOAA and meteorological observational data,the weather process of freezing rain on February 24,2010 in Shenyang region was analyzed.The results show that obvious warming prior to the freezing rain is the important reason causing freezing rain disaster in Shenyang region.Warm and deep layer between 925 hPa and 750 hPa in which temperature is equal or greater than 0 ℃ is the necessary condition for the formation of freezing rain.Southwest airflow contributes to the transmission of warm and moist air to the northeast region,and it could determine the range of freezing disaster occurrence.The time of establishment and destruction of warm and deep middle layer is indicative to forecast of freezing rain.
出处
《气象与环境学报》
2010年第6期43-46,共4页
Journal of Meteorology and Environment
基金
"沈阳桃仙国际机场客观分析诊断系统"项目资助
关键词
冻雨
高低空环流
中层暖层结构
西南气流
增温
Freezing rain
Upper and lower air circulation
Warm structure of middle layer
Southwest airflow
Warming
