2022年夏季热带印度洋-太平洋海温异常对长江中下游高温异常的影响  

The impact of tropical Indo-Pacific ocean sea surface temperature anomalies on high temperature anomalies in the middle and lower reaches of the Yangtze River basin in the summer of 2022

作　　者：金大超[1] 管兆勇[1] 王子佳 闫尊 JIN Dachao;GUAN Zhaoyong;WANG Zijia;YAN Zun(Key Laboratory of Meteorological Disasters of Ministry of Education(KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science and Technology,Nanjing 210044,China;College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心,江苏南京210044 [2]河海大学水文水资源学院,江苏南京210098

出　　处：《大气科学学报》2024年第5期713-720,共8页Transactions of Atmospheric Sciences

基　　金：国家重点研发计划重点专项(2019YFC1510201);国家自然科学基金项目(42088101)。

摘　　要：利用NCEP/NCAR再分析资料、ERSST v5海表温度资料和大气环流模式,分析了2022年夏季热带印度洋-太平洋海温异常对长江中下游地区高温事件的影响机理及相对贡献。研究表明,此次高温异常事件受La Ni a事件和负位相IOD事件的共同影响,长江中下游地区的温度异常为1.52℃、为近40年来最高,温度正异常的极大值位于河南和湖北两省交界处的西侧。热带印度洋和太平洋海温异常引起了长江中下游约0.39℃的增温,对长江中下游地区此次高温异常的贡献为25.66%。La Ni a事件和负位相IOD事件可通过增强西太平洋副热带高压,进而有利于维持长江中下游地区的异常下沉运动,为高温事件的发生提供了有利条件。Using NCEP/NCAR reanalysis data,ERSST v5 sea surface temperature data,and an atmospheric circulation model,we analyzed the mechanisms and relative contributions of tropical Indo-Pacific ocean SST anomalies to the high-temperature event in the middle and lower reaches of the Yangtze River basin during the summer of 2022.The study shows that the summer of 2022 recorded the highest temperatures in the middle and lower reaches of the Yangtze River basin in the past 40 years,with an area mean anomalous temperature of 1.52℃.The spatial distribution of positive temperature anomalies in this region was highly uneven,with the maximum anomalies located to the west of the Henan-Hubei border.This positive temperature anomaly event was influenced by both La Ni a and the negative phase of the IOD.After removing the ENSO and IOD signals,the anomalous temperatures in the middle and lower reaches of the Yangtze River were 1.23 and 1.37℃,respectively.When both ENSO and IOD signals were removed,the temperature anomaly was 1.13℃,indicating that tropical Indian Ocean and Pacific SST anomalies contributed 25.66%to the summer high-temperature anomalies in this region.The atmospheric Matsuno-Gill response to the La Ni a event caused an anticyclonic circulation anomaly from the middle and lower reaches of the Yangtze River to the Northwest Pacific region.The negative phase IOD event enhanced the subtropical high in the western Pacific by strengthening the easterly anomalies over the Maritime Continent.The strengthened western Pacific subtropical high favored maintaining anomalous subsidence motion in the middle and lower reaches of the Yangtze River basin,facilitating the occurrence of the high-temperature event.These results provide a scientific basis for understanding the extreme high-temperature events in the middle and lower reaches of the Yangtze River basin during summer.

关 键 词：2022年夏季 长江中下游地区 高温异常 热带印度洋-太平洋 海温异常 

分 类 号：P731.11[天文地球—海洋科学] P461.2