20世纪80年代中期以来东亚大槽和东中国海海温关系的年代际减弱和成因分析  

Weakening relationship between the East Asian Trough and Sea Surface Temperature over East China Sea after mid-1980s and possible cause

作　　者：王国松[1,2] 侯敏 李琰[1,2] 牟林[1] 尚建设 宋军[1] 高佳[1] 李程[1] 李欢[1] WANG Guo-song HOU Min LI Yan MU Hn SHANG Jian-she SONG Jun GAO Jia H Cheng LI Huan(National Marine Data and Information Service, Tianjin 300171, China Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Xiamen 361005, China Tianjin Binhai New Area Meteorology Administration, Tianjin 300457, China Shandong Province Shanghe Meteorology Administration, Jinan 251600, China)

机构地区：[1]国家海洋信息中心,天津300171 [2]国家海洋局海洋-大气化学与全球变化重点实验室,福建厦门361005 [3]天津市滨海新区气象局,天津300457 [4]山东省商河县气象局,山东济南251600

出　　处：《海洋通报》2016年第6期649-656,共8页Marine Science Bulletin

基　　金：国家自然科学基金面上项目(41376014);国家科技支撑计划课题(2014BAB12B02);天津市科技支撑计划项目(14ZCZDSF00012);国家海洋局海洋-大气化学与全球变化重点实验室开放基金(GCMAC1402)

摘　　要：基于Had ISST(Hadley Centre Sea-ice and Sea surface Temperature Data Set)的月平均海温(SST)资料,对1960-2012年中国近海冬季SST的长期变化趋势进行了详细分析。结果显示冬季SST经历了一个显著的升温过程,增幅达0.018℃/年,在80年代末期发生了显著的气候增暖过程。对东亚冬季风子系统与冬季东中国海SST关系的年代际变化进行了分析。结果发现在1960-2012年间,东亚冬季风5个关键子系统中,东亚大槽与东中国海冬季SST年际变率上关系最为密切。进一步研究发现,自20世纪80年代中期以来,东亚大槽和东中国海冬季SST都发生了明显的年代际变化,其中东亚大槽为年代际减弱,而东中国海冬季SST发生了年代际增暖。尽管1960-2012年间东亚大槽与东中国海冬季SST有显著的负相关关系,但这种统计相关在1989-2012年期间显著减弱。这种相关减弱的原因很可能是由于NPO(North Pacific Oscillation)的年代际变化背景下的东亚大槽的强度减弱有关。Based on monthly mean HadlSST data, long-term changes of sea surface temperature （SST） in winter over the East China Sea （ECS） have been analyzed for the time period 1960-2012. The results show that SST in winter experiences a significant increase by the value of 0.018 ℃/year. An abrupt wanning of SST oceurred in late 1980s. The East Asian winter monsoon （EAWM） consists of subsystems such as the Siberian high, Aleutian low, East Asian Trough （EAT） , low-level northerly wind and high-level East Asian jet stream. It is revealed that the correlation between these subsystems and SST over East China Sea was calculated. The most significant relationship occurs between the EAT and SST over the ECS during 1960- 2012. Further study shows that there is also significant inter-annual relationship between EAT and SST over the ECS in winter during 1960-1983. However, the significant inter-annual relations in the previous period are found to have beendisrupted during 1989-2012. Further analysis reveals that after late 1980s, the intensity of EAT tends to decrease. These changes may have caused the weakening relationships between the EAWM and SST over the ECS during 1987-2012.

关 键 词：海温 东亚冬季风 东亚大槽 中国近海 年季变化 

分 类 号：P732.5[天文地球—海洋科学]