Influence of Tropical Western Pacific Warm Pool Thermal State on the Interdecadal Change of the Onset of the South China Sea Summer Monsoon in the Late-1990s  

作　　者：HUANGFU Jing-Liang HUANG Rong-Hui CHEN Wen 

机构地区：[1]Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2015年第2期95-99,共5页大气和海洋科学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41461164005,41375065,and 41230527)

摘　　要：An interdecadal shift in the onset date of the South China Sea summer monsoon(SCSSM) is identified during the late 1990 s by using the European Centre for Medium-Range Weather Forecasts Interim Reanalysis dataset. The mean onset date was brought forward by two pentads during 1999–2013 compared to that during 1979–1998. The large-scale atmospheric and oceanic change associated with this shift exhibits a significant interdecadal variation signal around 1998/1999, indicating that the shift during the late 1990 s is robust. Different from the well-known mid-1990 s shift, this shift carried more important systematical significance. Diagnostic analysis suggests that the earlier outbreak of the SCSSM was due to the interdecadal warming of the warm pool, which brought stronger convection anomalies and led to a weak western Pacific subtropical high(WPSH) during boreal spring(March–May). The earlier retreat of the WPSH was a direct cause of this shift.An interdecadal shift in the onset date of the South China Sea summer monsoon （SCSSM） is identified during the late 1990s by using the European Centre for Medium-Range Weather Forecasts Interim Reanalysis dataset. The mean onset date was brought forward by two pentads during 1999-2013 compared to that during 1979-1998. The large-scale atmospheric and oceanic change associated with this shift exhibits a significant interdecadal variation signal around 1998/1999, indicating that the shift during the late 1990s is robust. Different from the well-known mid-1990s shift, this shift carried more important systematical significance. Diagnostic analysis suggests that the earlier outbreak of the SCSSM was due to the interdecadal warming of the warm pool, which brought stronger convection anomalies and led to a weak western Pacific subtropical high （WPSH） during boreal spring （March-May）. The earlier retreat of the WPSH was a direct cause of this shift.

关 键 词：South China Sea summer monsoon interde-cadal change CONVECTION western Pacific subtropical high 

分 类 号：P425.42[天文地球—大气科学及气象学]