印度洋海面温度对黄淮地区夏季降水影响的年代际变化研究  

Study on interdecadal variation of impact of Indian Ocean SST on Huanghuai summer precipitation

作　　者：顾伟宗[1] 陈丽娟[2] 伯忠凯[3] GU Weizong;CHEN Lijuan;BO Zhongkai(Ensuring Center of Atmospheric Sounding Technology, Shandong Meteorological Bureau, Jinan 250031, China;Laboratory of Climate Studies (CMA), National Climate Center, Beijing 100081, China;Shandong Climate Center, Jinan 250031, China)

机构地区：[1]山东省气象局大气探测技术保障中心,山东济南250031 [2]国家气候中心中国气象局气候研究开放实验室,北京100081 [3]山东省气候中心,山东济南250031

出　　处：《海洋气象学报》2020年第4期89-96,共8页Journal of Marine Meteorology

基　　金：国家重点基础研究发展计划(973)项目(2015CB453203);国家自然科学基金项目(41275073);山东省气象局重点科研项目(2016sdqxz02)。

摘　　要：利用1961—2016年我国400个气象台站夏季降水资料、NCEP/NCAR再分析资料和NOAA的海面温度资料,分析了黄淮地区夏季降水与同期大气环流及前期海面温度关系的年代际变化特征。结果显示,20世纪80年代之前(后),前期冬季太平洋海面温度发生厄尔尼诺时,黄淮地区夏季降水偏少(多),20世纪80年代中期之前,前期冬季印度洋海面温度全区一致型模态与黄淮地区夏季降水关系较弱,但是从20世纪80年代中期开始,正相关关系明显增强。进一步研究发现,前期印度洋海面温度一致偏高时,夏季500 hPa高度场上,副热带高压明显增强,这种相关关系20世纪80年代中期之后明显强于20世纪80年代之前,海平面气压场上,高相关区在20世纪80年代之后呈现明显的南方涛动模态,印度洋海面温度通过影响决定黄淮地区夏季降水异常的大气环流关键区域,使得其与黄淮地区夏季降水的关系随着年代际变化增强。Based on the summer precipitation data of 400 meteorological stations in China,NCEP/NCAR reanalysis data,and NOAA SST(sea surface temperature)dataset from 1961 to 2016,the interdecadal variations of the relationship between the summer precipitation in the Huanghuai region and synchronous circulation as well as that between the summer precipitation in the Huanghuai region and SST of the last year are studied.The results show before(after)the 1980s,when El Nino occurs to the Pacific SST in the last winter,the summer precipitation in the Huanghuai region is less(more);before the mid-1980s,the relationship between the Indian Ocean Basin-wide(IOBW)of the last winter and the summer precipitation in the Huanghuai region is weak,while from the 1980s,the positive correlation is significantly enhanced.Further study shows when the Indian Ocean SST is consistently higher in the last year,the subtropical high in the geopotential height field at 500 hPa in summer is greatly enhanced,and such correlation after the mid-1980s is obviously stronger than that before the 1980s.On the sea-level pressure field,the area of higher correlation presents obvious Southern Oscillation mode after the 1980s,and the Indian Ocean SST strengthens its relationship with the summer precipitation in the Huanghuai region with interdecadal variations by affecting the key circulation areas which determines the summer precipitation anomaly in the Huanghuai region.

关 键 词：黄淮地区 夏季降水 海面温度 年代际 

分 类 号：P462.4[天文地球—大气科学及气象学] P468.024