气候变化领域集成服务门户(CCPortal): Historical and projected low-frequency variability in the Somali Jet and Indian Summer Monsoon

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DOI	10.1007/s00382-020-05492-z
	Historical and projected low-frequency variability in the Somali Jet and Indian Summer Monsoon
	Jain S.; Mishra S.K.; Anand A.; Salunke P.; Fasullo J.T.
发表日期	2020
ISSN	0930-7575
英文摘要	Using reanalysis data and observations, interannual variations and long-term trends in the Somali Jet (hereafter, the Jet) and Indian Summer Monsoon Rainfall (ISMR) are characterized for drought vs flood, El Niño vs La Niña, and positive vs negative Indian Ocean Dipole (IOD) summer monsoon seasons. In flood years, the Jet is stronger over the upstream sector (i.e., Arabian Sea) and weaker over the downstream (i.e., Bay of Bengal), resulting in additional convergence and enhanced moisture transport over India, whereas the reverse occurs during drought years. The Jet and ISMR characteristics for El Niño (La Niña) years are similar to drought (flood) years, despite only around half of dry (wet) years, being associated with El Niño (La Niña). In +IOD years, the Jet shifts northward and intensifies over central and northern India, bringing more moisture and rainfall to those regions, while the −IOD has an opposite but relatively weak impact on ISMR. Over the last century, the Jet has become weaker over peninsular India, with reductions in rainfall across east India. Future projections under the SSP585 scenario from the CMIP6 multi-model mean suggest that the Jet will progressively shift northward and strengthen over the Arabian Sea, with associated rainfall increases over entire Indian region. The long-term changes in the Jet over the twentieth century are of comparable magnitude to interannual variations; however, the absolute magnitude of projected future changes is smaller than interannual variations observed in the past. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	El niño; Indian Ocean dipole; Indian Summer Monsoon Rainfall; Jet; La niña
语种	英语
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145650
作者单位	Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, Delhi 110016, India; School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FF, United Kingdom; National Center for Atmospheric Research (NCAR), Boulder, CO 80307, United States
推荐引用方式 GB/T 7714	Jain S.,Mishra S.K.,Anand A.,et al. Historical and projected low-frequency variability in the Somali Jet and Indian Summer Monsoon[J],2020.
APA	Jain S.,Mishra S.K.,Anand A.,Salunke P.,&Fasullo J.T..(2020).Historical and projected low-frequency variability in the Somali Jet and Indian Summer Monsoon.Climate Dynamics.
MLA	Jain S.,et al."Historical and projected low-frequency variability in the Somali Jet and Indian Summer Monsoon".Climate Dynamics (2020).