Reduction of the East Asian winter monsoon interannual variability after the mid-1980s and possible cause  

作　　者：HE ShengPing 

机构地区：[1]Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences [2]Climate Change Research Center, Chinese Academy of Sciences [3]Graduate University of Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2013年第12期1331-1338,共8页

基　　金：supported by the National Natural Science Foundation of China (41130103);the National Basic Research Program of China (2009CB421406)

摘　　要：The East Asian winter monsoon (EAWM) consists of subsystems such as the Siberian high, Aleutian low, East Asian trough, low-level northerly wind and high-level East Asian jet stream. It is revealed that the interannual variation of the EAWM-related atmospheric circulation has exhibited an obvious weakening since the mid-1980s. During 1956-1980, significant negative correlations between the EAWM and sea surface temperature are observed in the oceans along the east coast of East Asia, accompanied by significant positive correlations in the western Warm Pool. However, the significant interannual relationship in the previous period is found to have been disrupted during 1986-2010. Further analysis reveals that the Arctic Oscillation after the mid-1980s tends to suppress the interannual variability of the EAWM. In addition, it was found that the large-scale warming after the mid-1980s is favorable to reduce the land-sea thermal contrast variability on both the interdecadal and interannual time scales.The East Asian winter monsoon （EAWM） consists of subsystems low-level northerly wind and high-level East Asian jet stream. It is such as the Siberian high, Aleutian low, East Asian trough, revealed that the interannual variation of the EAWM-related atmospheric circulation has exhibited an obvious weakening since the mid-1980s. During 1956-1980, significant negative correlations between the EAWM and sea surface temperature are observed in the oceans along the east coast of East Asia, accompanied by significant positive correlations in the western Warm Pool. However, the significant interannual relationship in the previous period is found to have been disrupted during 1986-2010. Further analysis reveals that the Arctic Oscillation after the mid-1980s tends to suppress the interannual variability of the EAWM. In addition, it was found that the large-scale warming after the mid-1980s is favorable to reduce the land-sea thermal contrast variability on both the interdecadal and interannual time scales.

关 键 词：东亚冬季风 东亚大槽 年际变化 年代际 中期 年际时间尺度 原因 西伯利亚高压 

分 类 号：P425.42[天文地球—大气科学及气象学] TS34[轻工技术与工程]