夏季东北冷涡气候特征分析

Climatic Characteristics of Northeast Cold Vortex in Summer

利用1980—2015年夏季NCEP 2.5°×2.5°逐日再分析资料和四平市各县站逐日降水资料。采用气候倾向率、气候趋势系数、小波分析等方法,统计了1980—2015年的东北冷涡气候特征,得出以下结论:东北冷涡夏季年均出现23.4 d,占夏季总天数的25.4%;东北冷涡出现天数和出现频次整体呈现下降趋势,1980—2015年存在1个2年周期,东北冷涡在6月出现最多,7月次之,平均每个东北冷涡过程持续时间约为4.1 d。

Daily NCEP2.5°×2.5° reanalysis data and daily precipitation data of each county station in Siping City from 1980 to 2015 were used. Based on climate trend rate, climate trend coefficient and wavelet analysis, the climatic characteristics of the northeast cold vortex during 1980-2015 were analyzed. The following conclusions were drawn: the annual average occurrence of the northeast cold vortex in summer was 23.4 days, accounting for 25.4% of the total days in summer. The occurrence days and frequency of THE NORTHEAST Cold Vortex showed a decreasing trend as a whole, and there was a 2-year cycle from 1980 to 2015.The northeast cold vortex appeared the most in June, followed by July, and the average duration of each process was about 4.1 days.