Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-019-05071-x |
Significant changes in the ENSO-monsoon relationship and associated circulation features on multidecadal timescale | |
Seetha, C. J.1,2; Varikoden, Hamza2; Babu, C. A.1; Kuttippurath, J.3 | |
2019-12-05 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | India |
英文摘要 | We observe significant changes in the ENSO-Indian summer monsoon rainfall (ISMR) relationship in past three multidecadal epochs (early epoch: 1931-1960, middle epoch: 1961-1990, and recent epoch: 1991-2015) based on consistent correlation. The rainfall during early epoch was above normal, however, in other two epochs it was relatively dry. The ENSO-ISMR relationship and its changes are mostly pronounced in the monsoon core zone. During the early epoch, the effect of La Nina was more dominant by accounting higher number of La Nina events with higher values of Nino 3.4 index, which can be attributed to the surplus rainfall over most regions of India. The rainfall during the consecutive two multidecadal epochs is below normal and this may be attributed to the strong El Nino events. The dryness in the northeast region cannot be linked with ENSO events as it has insignificant relationship with the rainfall over this region. The weakening of Low Level Jet during the recent epoch can be a reason to reduce monsoon rainfall during recent periods. It is evident that the reduced moisture transport also accounts for the reduced precipitation. The changes in equatorial Walker and regional Hadley circulations during the three epochs show the same mode of variability and in phase with the changes in rainfall and other circulation related parameters. This study emphasizes the basin mode warming of world oceans and the increased frequency of El Nino events during the recent epochs linked to the climate change and its impact of ISMR. |
英文关键词 | ISMR ENSO Multidecadal variability Circulation Moisture flux |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000500870800001 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; ASIAN SUMMER MONSOON ; INDIAN-OCEAN DIPOLE ; EL-NINO ; SOUTHERN-OSCILLATION ; RAINFALL RELATIONSHIP ; INTERDECADAL CHANGES ; DECADAL VARIATIONS ; CLIMATE-CHANGE ; TIME SCALES |
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/224311 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Cochin Univ Sci & Technol, Dept Atmospher Sci, Kochi 682016, India; 2.Indian Inst Trop Meteorol, Pune 411008, Maharashtra, India; 3.Indian Inst Technol Kharagpur, CORAL, Kharagpur, W Bengal, India |
推荐引用方式 GB/T 7714 | Seetha, C. J.,Varikoden, Hamza,Babu, C. A.,et al. Significant changes in the ENSO-monsoon relationship and associated circulation features on multidecadal timescale[J]. CLIMATE DYNAMICS,2019. |
APA | Seetha, C. J.,Varikoden, Hamza,Babu, C. A.,&Kuttippurath, J..(2019).Significant changes in the ENSO-monsoon relationship and associated circulation features on multidecadal timescale.CLIMATE DYNAMICS. |
MLA | Seetha, C. J.,et al."Significant changes in the ENSO-monsoon relationship and associated circulation features on multidecadal timescale".CLIMATE DYNAMICS (2019). |
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