Analysis on Frost Weather in Southeast Jilin Province in August of 2009

• 作者: YUN Tian LIU Zheng
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: 霜冻天气 天气分析 吉林省 东南部 强冷空气 观测资料 诊断方法 环流形势
• 年，卷（期）: 2012,（8）
• 页码范围: 1-3
• 页数: 3页
• 分类号: P458.121.1

摘要

[Objective]The research aimed to analyze frost weather in southeast Jilin Province in August of 2009. [Method]Based on NECP reanalysis data and routine observation data,by using analytic and diagnostic methods of the synoptics,frost weather in southeast Jilin Province in August of 2009 was analyzed from circulation situation,weather factor characteristics and so on. [Result] It was a strong cold air influence process with cold wave outbreak property. In prior period,high-altitude situation was stable,and it was high-temperature and rainless in Jilin. In later period,polar vortex and big trough deepened and developed,and strong cold air went south. After big trough and cold front moved eastward,cold air erupted in the province. Generation condition of the frost weather in southeast Jilin Province was that East Asian big trough and strong cold front transited,and high altitude of Jilin Province was controlled by northwest airflow. 850 hPa temperature ≤4 ℃ in central east Jilin Province. Center intensity of the cold high reached 1 020 hPa,and it was just in central east Jilin Province. Control time of the cold air ≥36 h,and rainfall <10 mm in 48 h. [Conclusion]Weather and factor conditions in the process had important significance for future frost weather forecast in summer.