El Nino and the Indian rainfall in June

被引:0
|
作者
Gadgil, Sulochana [1 ]
Francis, P. A. [2 ]
机构
[1] Indian Inst Sci, Ctr Atmospher & Ocean Sci, Bengaluru 560012, Karnataka, India
[2] Minist Earth Sci, Indian Natl Ctr Ocean Informat Serv, Hyderabad 500090, Andhra Pradesh, India
来源
CURRENT SCIENCE | 2016年 / 110卷 / 06期
关键词
All-India rainfall; El Nino; ENSO index; West pacific; SUMMER MONSOON; EQUATORIAL PACIFIC; PREDICTION; SOUTH;
D O I
暂无
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We have addressed the question of whether the massive deficit of 42% in rainfall over the Indian region in June 2014 can be attributed primarily to the El Nino. We have shown that the variation of convection over the Northern part of the Tropical West Pacific (NWTP: 120-150E, 20-30N) plays a major role in determining the all-India rainfall in June with deficit (excess) in rainfall associated with enhancement (suppression) of convection over NWTP. In June 2014, the outgoing long wave radiation (OLR) anomaly over this region was unfavourable, whereas in June 2015, the OLR anomaly over NWTP was favourable and the all-India rainfall was 16% higher than the long-term average. We find that during El Nino, when the convection over the equatorial central Pacific intensifies, there is a high propensity for intensification of convection over NWTP. Thus, El Nino appears to have an impact on the rainfall over the Indian region via its impact on the convection over the West Pacific, particularly over NWTP. This occurred in June 2014, which suggests that the large deficit in June 2014, could be primarily attributed to the El Nino acting via intensification of convection over NWTP.
引用
收藏
页码:1010 / 1022
页数:13
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