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DOI | 10.1007/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
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
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 |
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/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 |
推荐引用方式 GB/T 7714 | 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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