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DOI | 10.1088/1748-9326/aabdd5 |
Preceding winter La Nina reduces Indian summer monsoon rainfall | |
Chakraborty, Arindam1,2 | |
2018-05-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2018 |
卷号 | 13期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
英文摘要 | Leaving out the strong El Nino Southern Oscillation (ENSO) years, our understanding in the interannual variation of the Indian summer monsoon rainfall (ISMR) stands poor for the rest. This study quantifies the role of ENSO in the preceding winter on ISMR with a particular emphasis on ENSO-neutral summer and La Nina winter. Results show that, unlike the simultaneous ENSO-ISMR relationship, La Nina of previous winter reduces mean rainfall over the country by about 4% even during ENSO neutral summer. Moreover, when ENSO changes phase from La Nina in winter to El Nino in summer, ISMR is anomalously lower than during persisting El Nino years (-14.5% and -5.3%, respectively), increasing the probability of severe drought. This suppression effect of La Nina of the preceding winter on summer monsoon precipitation over India is mostly experienced in its western and southern parts. Principal component analysis of the zonal propagation of surface pressure anomalies from winter to summer along Northern Hemisphere subtropics decomposes interannual variations of seasonally persisting anomalies from zonal propagations. The dominant modes are associated with the seasonal transition of the ENSO phase, and are well correlated with date of onset and seasonal mean rainfall of monsoon over India. These results improve our understanding of the interannual variations of ISMR and could be used for diagnostics of general circulation models. |
英文关键词 | Indian summer monsoon droughts winter La Nina moisture flux global delayed teleconnection |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000456532500003 |
WOS关键词 | SOUTHERN-OSCILLATION ; EL-NINO ; GLOBAL MODES ; PACIFIC ; CLIMATE ; VARIABILITY ; PREDICTION ; ATMOSPHERE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/14955 |
专题 | 气候变化 |
作者单位 | 1.Indian Inst Sci, Ctr Atmospher & Ocean Sci, Bangalore 560012, Karnataka, India; 2.Indian Inst Sci, Divecha Ctr Climate Change, Bangalore 560012, Karnataka, India |
推荐引用方式 GB/T 7714 | Chakraborty, Arindam. Preceding winter La Nina reduces Indian summer monsoon rainfall[J]. ENVIRONMENTAL RESEARCH LETTERS,2018,13(5). |
APA | Chakraborty, Arindam.(2018).Preceding winter La Nina reduces Indian summer monsoon rainfall.ENVIRONMENTAL RESEARCH LETTERS,13(5). |
MLA | Chakraborty, Arindam."Preceding winter La Nina reduces Indian summer monsoon rainfall".ENVIRONMENTAL RESEARCH LETTERS 13.5(2018). |
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