东北冷涡气候特征及其对内蒙古降水的影响  

Climatic Characters of Northeast China Cold Vortex and Its Impact on Precipitation in Inner Mongolia

作　　者：刘炜[1,2] Liu Wei(Inner Mongolia Climatic Center,Inner Mongolia Hohhot 010051;Key Open Laboratory for Northeast China Cold Vortex Research,Liaoning Shenyang 110166)

机构地区：[1]内蒙古气候中心,内蒙古呼和浩特010051 [2]东北冷涡研究重点开放实验室,辽宁沈阳110166

出　　处：《内蒙古气象》2021年第2期9-13,共5页Meteorology Journal of Inner Mongolia

基　　金：内蒙古气象局科技创新项目(nmqxkjcx201817)。

摘　　要：基于内蒙古116个气象观测站1981—2017年5—8月逐日降水资料及NECP逐月再分析资料,采用传统东北冷涡定义,对5—8月东北冷涡活动过程次数、日数进行客观识别,并分析了东北冷涡活动日数与内蒙古降水的关系。结果表明:(1)东北冷涡活动日数与500 hPa高度场在东北亚地区呈现出显著的“南负北正”偶极型相关分布,内蒙古东部地区处于显著负相关区。(2)5—8月平均每次冷涡活动过程的持续时间为5~6 d,且5、6月冷涡活动维持日数呈增加的趋势。(3)5—8月东北冷涡活动日数与降水存在显著正相关的区域主要位于内蒙古东部偏北地区,其中5、6月冷涡活动日数与冷涡日东部偏北地区累计降水量存在显著正相关,表明冷涡活动具有气候“累积效应”。Based on the daily precipitation data of 116 stations in Inner Mongolia and the NECP monthly reanalysis data,according to traditional definition of Northeast China Cold Vortex,the frequency and days of the Northeast China Cold Vortex activities from May to August were identified objectively,and the relationships between the days of Northeast China Cold Vortex and the precipitation in Inner Mongolia were analyzed.The results were as follows.(1)The correlation between the active days of Northeast China Cold Vortex and the 500hPa height field in Northeast Asia shows a significant dipole distribution and there is a significant negative correlation in Eastern Inner Mongolia.(2)The average duration of each Northeast China Cold Vortex activity from May to August is 5-6 days,and the duration of Northeast China Cold Vortex activities is increased in May and June.(3)There is a significant positive correlation between the active days of Northeast China Cold Vortex and precipitation in Northeast Inner Mongolia from May to August.The positive correlation between the active days of Northeast China Cold Vortex and the average precipitation in Northeast Inner Mongolia is significant in May and June.It shows that the Northeast China Cold Vortex activities have climate"cumulative effect".

关 键 词：东北冷涡 客观识别 环流异常 冷涡降水 

分 类 号：P463[天文地球—大气科学及气象学]