2017年我国区域性高温过程特征及异常大气环流成因分析  

Characteristics and abnormal atmospheric circulation of regional high temperature process in 2017 over China

作　　者：王国复[1] 叶殿秀[1] 张颖娴[1] 黄大鹏[1] 侯威[1] WANG Guo-Fu;YE Dian-Xiu;ZHANG Ying-Xian;HUANG Da-Peng;HOU Wei(National Climate Center,China Meteorological Administration,Beijing 100081,China)

机构地区：[1]中国气象局国家气候中心,北京100081

出　　处：《气候变化研究进展》2018年第4期341-349,共9页Climate Change Research

基　　金：公益类行业(气象)科研专项(GYHY20140617);国家科技基础资源调查专项(2017FY101201);中国气象局气候变化专项(CCSF201701;CCSF201803)

摘　　要：基于区域性高温过程综合强度指数,利用1961年1月—2017年8月全国2452个气象站的日最高气温和2017年NCEP/NCAR再分析资料,分析2017年我国区域性高温过程的特征,并探讨2017年夏季我国第2次区域性高温事件的形成机理。2017年我国区域性高温过程呈现强度强、日数长、覆盖范围大的特点。在气候变暖的背景下,我国单次区域性高温过程最大影响范围呈极明显扩大趋势。2017年7月上中旬,强大的大陆高压控制我国北方地区,进而造成了这次影响范围广、持续时间长的高温事件。7月下旬,我国广大南方地区处于副热带高压脊的控制下,强大的下沉气流和反气旋环流,使得大气层更加稳定,最终导致高温天气的形成。Based on the comprehensive strength index of regional high temperature process,the daily maximum temperature of 2452 national stations from January 1961 to August 2017 and the NCEP/NCAR reanalysis data in 2017 were used to analyze the characteristics of regional high temperature process in 2017,as well as the formation mechanism of the second regional high temperature event in summer of 2017.In 2017,regional high temperature event over China showed features of high intensity,long duration,and large coverage.Under the background of climate warming,the maximum influence domain of the single regional high temperature process in China was extending obviously.In the early July of 2017,the powerful continental high pressure controlled the northern part of China,which caused the high temperature event with a wide range of influence and a long duration.In the late July,the vast southern region of China was under the control of the subtropical ridge.The strong downdraft and anti-cyclonic circulation made the atmosphere more stable,which finally led to the formation of high temperature weather.

关 键 词：区域性高温过程 2017年夏季 形成机理 

分 类 号：P423[天文地球—大气科学及气象学] P434