1990s年代际转型前后南海季风系统的气候季节内振荡(CISO)特征

邢雯; 黄菲; 王宏; 黄少妮

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季节内振荡(CISO)特征

doi: 10.3969/j.issn.1004-4965.2012.01.004

中国海洋大学山东省高校海洋-大气相互作用与气候重点实验室/海洋气象联合开放实验室(JOLMM),山东青岛 266100

基金项目: 国家自然科学基金项目(40975038,40830106); 中国气象局行业专项(GYHY200906008);国家重大科学研究计划(2012CB955604);高等学校创新引智计划(B07036)共同资助

计量
- 文章访问数: 1747
- HTML全文浏览量: 4
- PDF下载量: 1954
- 被引次数: 0
出版历程
- 收稿日期: 2010-07-09
- 修回日期: 2011-10-08

CLIMATOLOGICAL INTRAEASONAL OSCILLATION OF THE SOUTH CHINA SEA MONSOON SYSTEM BEFORE AND AFTER THE DECADAL SHIFT IN 1990S

Key Laboratory of Ocean-Atmosphere Interaction and Climate in Universities of Shandong (Ocean University of China) and Joint Open Laboratory of Marine Meteorology (JOLMM), Ocean University of China, Qingdao 266100, China

摘要

摘要: 利用多变量经验正交分解(MV-EOF)等方法,研究了在季节内振荡尺度上南海季风系统的时空分布特征。结果表明：南海夏季风的爆发时间在1993/1994年前后存在显著的年代际转型,由爆发偏晚转变成爆发偏早。第一模态反映了南海夏季风爆发时季风系统的时空特征,转型前后特征类似,降水场自赤道向北依次呈现干-湿-干交替分布的特征,南海中心为异常气旋。相应的大范围环流场主要反映了转型前的偏晚年,南海夏季风槽位置偏南,转型后的偏早年,南海夏季风槽位置偏北。第二模态体现了南海季风系统夏季的时空特征,转型前后共同特征表现为南海地区夏季北湿南干的南北偶极子降水分布及南海中心区的异常西风。相应的大范围环流场主要反映了南海季风活动与东亚季风呈现反位相的特点,且对流信号向北传播。转型前的偏晚年,季风活动受准双周振荡控制,对流信号由西北方向传入南海;转型后的偏早年,季风活动以30～60天振荡为主,对流信号由东南方向传播至南海。
- 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
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.
- onset of South China Sea summer monsoon /
- decadal shift in the 1990s /
- climatological intraseasonal oscillation (CISO) /
- spatial-temporal distribution

HTML全文

参考文献(25)

[1]	谢安, 张振洲. 南海夏季风的推进[J]. 气象学报, 1994, 52(3)：374-378.
[2]	TAO S Y, CHEN L X. A review of recent research on the East Asian summer monsoon in China. Monsoon Meteorology[M]. Oxford: Oxford University Press: Chang C P, Krishnamurti T N, Eds, 1987: 60-92.
[3]	余志豪. 南海季风研究的近况[J]. 海洋地质动态, 2002, 18(4)：23-24.
[4]	李崇银, 张利平. 南海夏季风活动及其影响[J]. 大气科学, 1999, 23(3)：257-266.
[5]	李崇银, 屈昕. 伴随南海夏季风爆发的大气大尺度环流特征[J]. 大气科学, 2000, 24(1)：1-14.
[6]	吴尚森, 梁建茵, 李春晖. 南海夏季风强度与我国汛期降水的关系[J]. 热带气象学报, 2003, 19(增刊)：25-36.
[7]	MADDEN R A, JULIAN P R. Detection of a 40-50 day oscillation in the zonal wind in the tropical Pacific[J]. J Atmos Sci, 1971, 28(5): 702-708.
[8]	MADDEN R A, JULIAN P R. Description of global-scale circulation cells in the tropics with a 40-50 day period[J]. J Atmos Sci, 1972, 29(6): 1 109-1 123.
[9]	KRISHNAMURTI T N, ARDANUY P. The 10-20-day westward propagating mode and breaks in the monsoons[J]. Tellus, 1980, 32(1): 15-26.
[10]	KRISHNAMURTI T N, SUBRAHMANYAM D. The 30-50 day mode at 850mb during MONEX[J]. J Atmos Sci, 1982, 39(9): 2 088-2 095.
[11]	CHEN T C, CHEN J M.The 10-20-day mode of the 1979 Indian monsoon: Its relation with the time variation of monsoon rainfall[J]. Mon Wea Rev, 1993, 121(9): 2 465-2 482.
[12]	CHEN T C, CHEN J M. An observational study of the South China Sea monsoon during the 1979 summer: Onset and life cycle[J]. Mon Wea Rev, 1995, 123(8): 2 295-2 318.
[13]	CHAN J C L, AI W, XU J. Mechanisms responsible for the maintenance of the 1998 South China Sea summer monsoon[J]. J Meteor Soc Japan, 2002, 80(5): 1 103-1 113.
[14]	穆明权, 李崇银. 1998年南海夏季风的爆发与大气季节内振荡的活动[J]. 气候与环境研究,2000,5(4)：375-387.
[15]	MAO Jiangyu, CHAN J C L. Intraseasonal Variability of the South China Sea Summer Monsoon[J]. J of Climate, 2005, 18(13): 2 388-2 402.
[16]	CHEN T C, YEN M C, WENG S P. Interaction between the Summer Monsoon in East Asia and the South China Sea: Intraseasonal Monsoon Modes[J]. J Atmos Sci, 2000, 57(9): 1 373-1 392.
[17]	WANG B, HUANG F, WU Z, ct al. Multi-Scale Climate Variability of the South China Sea Monsoon: A Review[J]. Dyn Atmos Ocean, 2009, 47(1/3): 15-37.
[18]	WANG B, LIN H. Rainy seasons of the Asian-Pacific monsoon[J]. J Climate, 2002, 15(4): 386-398.
[19]	黄菲,邢雯,李元妮,等. 1990s年代际转型前后南海季风系统的季节变化[J]. 中国海洋大学学报,2011,41(1/2)：9-15.
[20]	WANG B. The vertical structure and development of the ENSO anomaly mode during 1979-1989[J]. J Atmos Sci, 1992, 49(8): 698-712.
[21]	WANG B, LIN H, ZHANG Y, ct al. Definition of South China Sea Monsoon Onset and Commencement of the East Asia[J]. Jounal of Climate, 2004, 17(4)：699-710.
[22]	NORTH G R, BELL T L, CAHALAN R F, ct al. Sampling errors in the estimation of empiriacal orthogonal functions[J]. Mon Wea Rev, 1982, 110(7): 699- 706.
[23]	周发琇, 张涛,高荣珍,等. 南海季风区地域性大气环流的结构[J]. 中国海洋大学学报,2001,31(4)：467-472.
[24]	朱伟军, 孙照渤, 齐卫宁. 南海季风爆发及其环流特征[J]. 南京气象学院学报, 1997, 20(4)：440-446.
[25]	高辉. 南海夏季风爆发前后深对流传播的多向性[J]. 大气科学, 2009, 33 (1): 29-37.