###
气象:2023,49(9):1119-1130
本文二维码信息
码上扫一扫!
长江流域夏季高温年代际变化季内非一致特征及其环流异常分析
肖莺,张俊,杜良敏,任永建,高雅琦
(武汉区域气候中心,武汉 430074; 湖北省烟草气象研究重点实验室,武汉 430205; 三峡国家气候观象台,湖北宜昌 443002; 中国气象局流域强降水重点开放实验室,武汉 430205; 三峡水利枢纽梯级调度通信中心,湖北宜昌 443133; 湖北省气象服务中心,武汉 430205)
Intraseasonal Inconsistency of Interdecadal Variations of Summer High Temperature in Yangtze River Basin and the Corresponding Atmospheric Circulation Anomaly
XIAO Ying,ZHANG Jun,DU Liangmin,REN Yongjian,GAO Yaqi
(Wuhan Regional Climate Center, Wuhan 430074; Key Laboratory of Tobacco Meteorology Research of Hubei Province, Wuhan 430205; Three Gorges National Climatological Observatory, Hubei, Yichang 443002; Key Laboratory of Basin Heavy Rainfall, CMA, Wuhan 430205; Three Gorges Cascade Dispatching and Communication Center, Hubei, Yichang 443133; Hubei Meteorological Service Center, Wuhan 430205)
摘要
图/表
参考文献
相似文献
本文已被:浏览 93次   下载 638
投稿时间:2022-05-21    修订日期:2023-08-02
中文摘要: 利用长江流域台站观测最高气温资料、梅雨资料和NCEP/NCAR再分析资料,分析了1961—2020年长江流域高温站次在夏季不同时期的年代际转折特征及其环流异常。结果表明:长江流域的高温主要集中发生在中东部(105°E以东区域)。长江流域中东部夏季高温在2002年前后存在气候突变,相对于35℃阈值,37℃和40℃的高温站次在突变前后的增量更加明显。季内不同时段的年代际变化具有非一致特征,可将其分为两类:增长平缓期,无明显的年代际转折;增长快速期,在2002年前后存在突变,且年代际相对变化率较夏季整个季节的相对变化率高。欧亚遥相关、东亚太平洋遥相关、梅雨结束时间是造成季内非一致性变化的主要原因。在增长快速期,高温年代际显著增多往往伴随着东亚遥相关的异常加强,其中相对变化率最大的两个时段在欧亚中高纬环流有着明显差异;而在增长平缓期,欧亚遥相关有小幅度的年代际增强,东亚遥相关年代际减弱,其中7月9—19日高温站次增长缓慢还和梅雨结束偏晚有关。
Abstract:Using the maximum temperature observation data, Meiyu data and NCEP/NCAR reanalysis data, we analyze the interdecadal variation characteristics of high temperature stations in Yangtze River Basin and the corresponding atmospheric circulation anomaly at different periods of summer from 1961 to 2020. The results show that high temperature events mainly occurred in the middle-east part (east of 105°E) of the Yangtze River Basin. There existed an abrupt mutation in the summer high temperature across this basin around 2002. Relative to the 35℃ threshold, the increments of high temperature stations at 37℃ and 40℃ were more obvious before and after the mutation. But interdecadal variation characteristics at different periods of summer were inconsistent, and they can be divided into two categories: the slow increasing periods without significant interdecadal turnings and the quick increasing periods, in which an abrupt mutation occurred around 2002 and the interdacadal relative change rates were higher than that of the whole season of summer. The Eurasian teleconnection, the East Asia-Pacific teleconnection and the end time of Meiyu were the major contributors to the intraseasonal inconsistency. During the quick increasing periods, the significant interdecadal increase of high temperature was always accompanied by abnormal intensification of East Asia-Pacific teleconnection. The circulations in the mid-high latitude over Eurasia were significantly different between the two periods with the largest relative change rates. During the slow increasing periods, however, Eurasian teleconnection strengthened at a lower magnitude, while East Asia-Pacific teleconnection was weakened. The slow increase of high temperature stations in 9-19 July was related to the late end of Meiyu.
文章编号:     中图分类号:P461    文献标志码:
基金项目:长江流域气象开放基金项目(CJLY2022Y07)、湖北省烟草公司科技项目(027Y2022-006)、中国长江三峡电力股份有限公司项目(2421020001)、湖北省自然科学基金项目(2022CFD014)、中国气象局复盘总结专项(FPZJ2023-082)和国家重点研发计划(2017YFC1502306)共同资助
引用文本:
肖莺,张俊,杜良敏,任永建,高雅琦,2023.长江流域夏季高温年代际变化季内非一致特征及其环流异常分析[J].气象,49(9):1119-1130.
XIAO Ying,ZHANG Jun,DU Liangmin,REN Yongjian,GAO Yaqi,2023.Intraseasonal Inconsistency of Interdecadal Variations of Summer High Temperature in Yangtze River Basin and the Corresponding Atmospheric Circulation Anomaly[J].Meteor Mon,49(9):1119-1130.