Impacts of the MJO on Winter Rainfall and Circulation in China

被引:97
作者
Jia Xiaolong [1 ]
Chen Lijuan [1 ]
Ren Fumin [1 ]
Li Chongyin [2 ,3 ]
机构
[1] China Meteorol Adm, Natl Climate Ctr, Beijing 100081, Peoples R China
[2] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China
[3] PLA Univ Sci & Technol, Inst Meteorol, Nanjing 211101, Peoples R China
基金
中国国家自然科学基金;
关键词
MJO; rainfall anomaly; subtropics; mid-high latitudes; vertical motion; MADDEN-JULIAN OSCILLATION; INTRASEASONAL OSCILLATION; EXTRATROPICAL RESPONSE; MOISTURE CONVERGENCE; LIFE-CYCLE; SUMMER; PRECIPITATION; MODULATION; CONVECTION; ASIA;
D O I
10.1007/s00376-010-9118-z
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Impacts of the MJO on winter rainfall and circulation in China are investigated using a real-time multivariate MJO index. Composite results using the daily rainfall anomalies and "rainy day" anomalies according to eight different MJO phases show that the MJO has considerable influence on winter rainfall in China. Rainfall anomalies show systematic and substantial changes (enhanced/suppressed) in the Yangtze River Basin and South China with the eastward propagation of the MJO convective center from the Indian Ocean to the western Pacific. When the MJO is in phase 2 and 3 (MJO convective center is located over the Indian Ocean), rainfall probability is significantly enhanced. While in phase 6 and 7 (MJO convective center is over the western Pacific), rainfall probability is significantly reduced. MJO in winter influences the rainfall in China mainly through modulating the circulation in the subtropics and mid-high latitudes. For the subtropics, MJO influences the northward moisture transport coming from the Bay of Bengal and the South China Sea by modulating the southern trough of the Bay of Bengal and the western Pacific subtropical high. For the mid-high latitudes, the propagation of the low frequency perturbations associated with the eastward-propagating MJO convection modulate the circulation in the mid-high latitudes, e.g. the East Asian winter monsoon and the low trough over central Asia.
引用
收藏
页码:521 / 533
页数:13
相关论文
共 78 条
[1]   Modulation of daily precipitation over southwest Asia by the Madden-Julian oscillation [J].
Barlow, M ;
Wheeler, M ;
Lyon, B ;
Cullen, H .
MONTHLY WEATHER REVIEW, 2005, 133 (12) :3579-3594
[2]  
Blade I, 1995, J ATMOS SCI, V52, P4448, DOI 10.1175/1520-0469(1995)052<4448:TLANER>2.0.CO
[3]  
2
[4]  
Bond NA, 2003, WEATHER FORECAST, V18, P600, DOI 10.1175/1520-0434(2003)018<0600:TIOTMO>2.0.CO
[5]  
2
[6]  
Carvalho LMV, 2004, J CLIMATE, V17, P88, DOI 10.1175/1520-0442(2004)017<0088:TSACZI>2.0.CO
[7]  
2
[8]  
CHAO WC, 1994, J ATMOS SCI, V51, P1282, DOI 10.1175/1520-0469(1994)051<1282:TIOSCC>2.0.CO
[9]  
2
[10]  
Chen LX, 2001, ADV ATMOS SCI, V18, P623