气象2018，Vol.44Issue(1)：199-205,7.DOI:10.7519/j.issn.1000-0526.2018.01.018
2017年夏季北半球大气环流特征及对我国天气气候的影响
Northern Hemisphere Atmospheric Circulation Characteristics in Summer 2017 and Its Impact on Weather and Climate in China
摘要
Abstract
During the summer of 2017 (June to August),the average precipitation over China was 348.6 mm,which is 8.1％ more than the climate mean (332.6 mm).Two rainfall belts were observed over eastern China.The average temperature in summer was 21.7℃,which is 0.8℃ higher than the climate mean (20.9℃).The summer of 2017 is the second warmest since 1961.The East Asian summer monsoon (EASM) was weaker than normal,while the West Pacific subtropical high (WPSH) was significantly stronger than normal with southward ridge position.The anomalous Philippine Sea anticyclone controlled the lower troposphere.The "-+-" circulation pattern was located in Eurasian mid-high latitude,with negative anomalous over Ural Mountain and near Japan and positive anomalous over Baikal Region.Circulation configuration of low latitudes and mid-high latitudes resulted in anomalous convergence of moisture flux and more precipitation over the south of the Yangtze River.Further analysis indicated that the interdecadal strengthening of West Pacific subtropical high and the sea surface temperature anomalies over the central and eastern tropical Pacific changing from negative to positive are the important cause for the significantly more precipitation over the south of the Yangtze River.关键词
夏季降水/西太平洋副热带高压/位相转换/年代际变化Key words
summer precipitation/West Pacific subtropical high/phase-switching/interdecadal variation分类
天文与地球科学引用本文复制引用
郑志海,王永光..2017年夏季北半球大气环流特征及对我国天气气候的影响[J].气象,2018,44(1):199-205,7.基金项目
国家自然科学基金项目(41475096)、国家科技支撑计划项目(2015BAC03B04)、国家重点研发计划专项(2017YFC1502303和2017YFA0603701)共同资助 （41475096）
