贾子康,郑志海,封国林. 2020. 中国南方地区盛夏高温类型及其对应的大尺度环流和海温异常[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.073
中国南方地区盛夏高温类型及其对应的大尺度环流和海温异常
Midsummer High Temperature Types in Southern China and their corresponding large-scale circulation and Sea Surface Temperature Anomalies
投稿时间:2019-07-24  修订日期:2020-07-09
DOI:10.11676/qxxb2020.073
中文关键词:  盛夏高温 聚类分析 大气环流 海温异常
英文关键词:Midsummer high temperature Clustering analysis Atmospheric circulation Sea surface temperature anomaly
基金项目:国家重点研发计划专项(2017YFC1502303),国家自然科学基金项目(41530531,41875101,41875096)
作者单位E-mail
贾子康 兰州大学大气科学学院 jiazk17@lzu.edu.cn 
郑志海 兰州大学大气科学学院国家气候中心 zhengzh@cma.gov.cn 
封国林 国家气候中心 fenggl@cma.gov.cn 
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中文摘要:
      利用中国2374个站点的日最高气温资料、NCEP/NCAR大气环流资料以及NOAA海温资料[目的]分析了中国南方盛夏高温的主要类型,比较了各类型高温对应的大尺度环流以及与海温异常信号之间的联系。研究结果表明:中国南方地区年高温日数有明显的增加趋势,利用聚类分析将中国南方盛夏高温分为江淮型、华南型和华中型三类。江淮型高温中心区域位于江淮地区,该类型高温空间范围大,发生频次高,典型的环流系统为高低空呈现异常反气旋,西太副高偏强偏西,南北位置略偏北。该类型高温是西太副高直接控制下的高温型,与前冬到夏季中部型El Ni?o衰减和春季赤道大西洋地区海温偏高有关。华南型高温中心区域在江南南部到华南地区,典型的环流系统是东亚副热带急流的位置偏南,西太副高偏强、偏西和脊线偏南,华南型高温也是西太副高直接控制下的高温,且伴随着西南季风的减弱,干热特征明显,该类型高温与东部型El Ni?o衰减及其与之相联系的印度洋电容器效应密切相关。华中型高温主要位于湖北省和湖南省,对应的环流型为西太副高偏弱偏东,在中高纬度与北大西洋-欧亚遥相关型类似,是大陆高压控制下的高温,使得水汽条件较另两类高温偏好。北大西洋-欧亚遥相关型是华中型高温的可能信号源。
英文摘要:
      Daily maximum temperature data of 2374 stations in China、NCEP/NCAR atmospheric circulation data and NOAA sea surface temperature(SST) data are used to analyze the main types of midsummer high temperature in Southern China, as well as the large-scale circulation corresponding to each type of high temperature and its relation with SST anomaly signals .The results show that the annual high temperature days in Southern China has a significant growth trend. Clustering analysis is used to classify the midsummer high temperature in Southern China into three types:Jianghuai type, South China type and Central China type.The Jianghuai type high temperature is centered on the Jianghuai area, with a wide range and high frequency. When the Jianghuai type high temperature occurs, the anomalous anticyclone is at high to low tropospheres, meanwhile the Western Pacific subtropical high (WPSH) is strong to the west,and its ridgeline is slightly northerly. So Jianghuai type high temperature is a high temperature type under control of WPSH. This type of high temperature is mainly related to the attenuation of the central type El Ni?o from the pre-winter to the summer and the warmer SST in equatorial Atlantic in spring.The central area of South China type high temperature is in the south of the Yangtze River to the South China.The typical circulation systems are the southerly position of East Asian subtropical jet , the stronger、westward WPSH and its ridgeline southerly.Also the South China type high temperature is directly under control of the WPSH,accompanied by the weakening of the southwest monsoon,and it has obvious characteristics of dry heat.This type of high temperature is closely related to the attenuation of the eastern type El Ni?o and its associated Indian Ocean capacitor effect.The Central China type high temperature is mainly located in Hubei province and Hunan province. The corresponding circulation is that the WPSH is slightly weaker and eastward and it''s similar to the North Atlantic - Eurasia remote correlation pattern in the middle and high latitudes. It is the high temperature under control of continental high pressure, which makes the water vapor condition better than the other two types of high temperature. The North Atlantic-Eurasian teleconnection is a possible signal source of Central China type high temperature.
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