热带气象学报2012，Vol.28Issue(1)：31-40,10.DOI:10.3969/j.issn.1004-4965.2012.01.004
1990s年代际转型前后南海季风系统的气候节内振荡(CISO)特征
CLIMATOLOGICAL INTRAEASONAL OSCILLATION OF THE SOUTH CHINA SEA MONSOON SYSTEM BEFORE AND AFTER THE DECADAL SHIFT IN 1990S
摘要
Abstract
Based on multi-variables empirical orthogonal function (MV-EOF) analysis, spatial and temporal patterns of the South China Sea (SCS) monsoon system in intraseasonal oscillation are analyzed. Results show that the onset of SCS summer monsoon shows a decadal shift around 1993/1994 from later-than-normal onset before 1993 to earlier-than-normal onset after 1994. The first leading mode shows similar characteristics during the onset of SCS summer monsoon (SCSSM) before and after the decadal shift. The spatial distribution of precipitation in early and late onset years shows a pattern of alternatively dry and wet from the equator to the north, and an anomalous cyclonic circulation is located north of the SCS at 850hPa. Corresponding large-scale circulation shows that relative to the first mode the SCSSM trough is southward in late onset years before the shift and it is northward in early onset years after the shift. The second mode reflects the characteristics during the summer after the onset of SCSSM. The second spatial distribution shows a north-south see-saw precipitation pattern and westerly anomaly at 850hPa over the SCS. Corresponding large-scale circulation shows northward propagation of convection signals and an out-of-phase relationship between SCSSM and EASM. Quasi-biweekly oscillation dominates the monsoon activities in late onset years and convection signals spread into the SCS from the northwest before the shift, while early onset years, after the shift, are controlled by 30-60-day oscillation and the convection signals enter the SCS from the southeast.关键词
南海夏季风爆发/1990s年代际转型/气候季节内振荡(CISO)/时空分布Key words
onset of South China Sea summer monsoon/decadal shift in the 1990s/climatological intraseasonal oscillation (CISO)/spatial-temporal distribution分类
天文与地球科学引用本文复制引用
邢雯,黄菲,王宏,黄少妮..1990s年代际转型前后南海季风系统的气候节内振荡(CISO)特征[J].热带气象学报,2012,28(1):31-40,10.基金项目
国家自然科学基金项目(40975038,40830106) （40975038,40830106）
中国气象局行业专项(GYHY200906008) （GYHY200906008）
国家重大科学研究计划(2012CB955604) （2012CB955604）
高等学校创新引智计划(B07036)共同资助 （B07036）
