气候变化领域集成服务门户(CCPortal): Role of moisture transport from Western Pacific region on water vapor isotopes over the Bay of Bengal

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DOI	10.1016/j.atmosres.2021.105895
	Role of moisture transport from Western Pacific region on water vapor isotopes over the Bay of Bengal
	Lekshmy P.R.; Midhun M.; Ramesh R.
发表日期	2022
ISSN	0169-8095
卷号	265
英文摘要	Bay of Bengal (BoB) region is a major moisture source to both Indian Summer Monsoon (ISM) and North East Monsoon (NEM) rainfall over the surrounding region. Oxygen isotopic ratios (δ18O) in the rainfall over the peripheral region show a decreasing trend towards the later months of ISM and shows minimum during NEM. This was previously explained with local factors of BoB such as isotopically depleted river discharge to BoB, increased cyclonic activity etc., however, the exact reasons remain unclear. δ18O of vapor collected from BoB when there was no cyclonic activity also shows ~2 ‰ depletion in NEM season compared to that during ISM. Here we show, easterly winds passing through a convectively active narrow zonal band (central to western equatorial Pacific and Indonesian region) bring significant amounts (median 64%: interquartile range 30%) of isotopically depleted moisture to BoB region, and results in anomalous depletion of vapor over BoB during NEM. Vapor source-tagged simulations from isotope enabled Community Atmospheric Model show easterly moisture flux from western Pacific region dominates over the BoB surface evaporation flux. © 2021 Elsevier B.V.
英文关键词	Bay of Bengal; Moisture transport; North east monsoon; Water vapor isotope
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236521
作者单位	Department of Atmospheric Sciences, Cochin University of Science and Technology, Kochi, 682016, India; Geosciences Division, Physical Research Laboratory, Ahmedabad, 380009, India
推荐引用方式 GB/T 7714	Lekshmy P.R.,Midhun M.,Ramesh R.. Role of moisture transport from Western Pacific region on water vapor isotopes over the Bay of Bengal[J],2022,265.
APA	Lekshmy P.R.,Midhun M.,&Ramesh R..(2022).Role of moisture transport from Western Pacific region on water vapor isotopes over the Bay of Bengal.Atmospheric Research,265.
MLA	Lekshmy P.R.,et al."Role of moisture transport from Western Pacific region on water vapor isotopes over the Bay of Bengal".Atmospheric Research 265(2022).