GSTDTAP  > 气候变化
DOI10.1007/s00382-016-3233-1
Indian summer monsoon rainfall variability in response to differences in the decay phase of El Nio
Chowdary, Jasti S.1; Harsha, H. S.1,2; Gnanaseelan, C.1; Srinivas, G.1; Parekh, Anant1; Pillai, Prasanth1; Naidu, C. V.2
2017-04-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2017
卷号48
文章类型Article
语种英语
国家India
英文摘要

In general the Indian summer monsoon (ISM) rainfall is near normal or excess during the El Nio decay phase. Nevertheless the impact of large variations in decaying El Nio on the ISM rainfall and circulation is not systematically examined. Based on the timing of El Nio decay with respect to boreal summer season, El Nio decay phases are classified into three types in this study using 142 years of sea surface temperature (SST) data, which are as follows: (1) early-decay (ED; decay during spring), (2) mid-summer decay (MD; decay by mid-summer) and (3) no-decay (ND; no decay in summer). It is observed that ISM rainfall is above normal/excess during ED years, normal during MD years and below normal/deficit in ND years, suggesting that the differences in El Nio decay phase display profound impact on the ISM rainfall. Tropical Indian Ocean (TIO) SST warming, induced by El Nio, decays rapidly before the second half of the monsoon season (August and September) in ED years, but persists up to the end of the season in MD years, whereas TIO warming maintained up to winter in ND case. Analysis reveals the existence of strong sub-seasonal ISM rainfall variations in the summer following El Nio years. During ED years, strong negative SST anomalies develop over the equatorial central-eastern Pacific by June and are apparent throughout the summer season accompanied by anomalous moisture divergence and high sea level pressure (SLP). The associated moisture convergence and low SLP over ISM region favour excess rainfall (mainly from July onwards). This circulation and rainfall anomalies are highly influenced by warm TIO SST and Pacific La Nia conditions in ED years. Convergence of southwesterlies from Arabian Sea and northeasterlies from Bay of Bengal leads to positive rainfall over most part of the Indian subcontinent from August onwards in MD years. ND years are characterized by negative rainfall anomaly spatial pattern and weaker circulation over India throughout the summer season, which are mainly due to persisting El Nio related warm SST anomalies over the Pacific. Atmospheric general circulation model simulation supports our hypothesis that El Nio decay variations modulate ISM rainfall and circulation.


英文关键词Indian summer monsoon El Nino decay phase Sea surface temperature Indian Ocean Tropospheric temperature
领域气候变化
收录类别SCI-E
WOS记录号WOS:000398926400036
WOS关键词SEA-SURFACE TEMPERATURE ; INDO-WESTERN PACIFIC ; COMMUNITY ATMOSPHERE MODEL ; SOUTHERN-OSCILLATION ; ENSO TELECONNECTIONS ; TROPICAL PACIFIC ; OCEAN CAPACITOR ; NINO EVENTS ; CLIMATE ; PREDICTABILITY
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/36307
专题气候变化
作者单位1.Indian Inst Trop Meteorol, Pune, Maharashtra, India;
2.Andhra Univ, Dept Meteorol & Oceanog, Visakhapatnam, Andhra Prades, India
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Chowdary, Jasti S.,Harsha, H. S.,Gnanaseelan, C.,et al. Indian summer monsoon rainfall variability in response to differences in the decay phase of El Nio[J]. CLIMATE DYNAMICS,2017,48.
APA Chowdary, Jasti S..,Harsha, H. S..,Gnanaseelan, C..,Srinivas, G..,Parekh, Anant.,...&Naidu, C. V..(2017).Indian summer monsoon rainfall variability in response to differences in the decay phase of El Nio.CLIMATE DYNAMICS,48.
MLA Chowdary, Jasti S.,et al."Indian summer monsoon rainfall variability in response to differences in the decay phase of El Nio".CLIMATE DYNAMICS 48(2017).
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