DOI: 10.1002/2015GL064517
论文题名: Spatial variation of amount effect over peninsular India and Sri Lanka: Role of seasonality
作者: Lekshmy P.R. ; Midhun M. ; Ramesh R.
刊名: Geophysical Research Letters
ISSN: 0094-9339
EISSN: 1944-9070
出版年: 2015
卷: 42, 期: 13 起始页码: 5500
结束页码: 5507
语种: 英语
英文关键词: amount effect
; paleomonsoon
; stable isotopes
Scopus关键词: Atmospheric thermodynamics
; Isotopes
; O rings
; Amount effects
; Cyclonic activities
; Indian summer monsoon
; Northeast monsoon
; paleomonsoon
; Peninsular india
; Spatial variations
; Stable isotopes
; Rain
; noise
; paleoclimate
; precipitation (climatology)
; proxy climate record
; rainfall
; seasonality
; spatial variation
; stable isotope
; Bay of Bengal
; India
; Indian Ocean
; Sri Lanka
英文摘要: The relationship between rain amount and rain δ18O of monsoon rain (amount effect) helps to reconstruct past monsoon variability from proxies (e.g., tree rings and speleothems). Analysis of new (and published) data of the δ18O of monsoon rains and vapor at nine stations shows that in regions of distinct seasonality in precipitation (e.g., peninsular India), the noise in such reconstructions can be minimized by a careful selection of sites. Peninsular India receives rain from both the Indian summer monsoon (ISM) and the northeast monsoon (NEM). Significant amount effect is observed only where the NEM rainfall is larger than or comparable to ISM rainfall. This is due to the higher quantity of NEM rain with more depleted 18O relative to ISM rain. NEM rain is more depleted in 18O because of cyclonic activity over Bay of Bengal, and the 18O depletion of Bay of Bengal surface waters due to post-ISM river runoff. Key Points Spatial variations of amount effect is driven by ratio of ISM to NEM rains Significant amount effect is observed in NEM-dominated region More 18O depletion of NEM rain is likely due to the cyclonic storms over BoB. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938149548&doi=10.1002%2f2015GL064517&partnerID=40&md5=e81f346de64928be61509b52a3627165
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8954
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Geosciences Division, Physical Research Laboratory, Ahmedabad, India
Recommended Citation:
Lekshmy P.R.,Midhun M.,Ramesh R.. Spatial variation of amount effect over peninsular India and Sri Lanka: Role of seasonality[J]. Geophysical Research Letters,2015-01-01,42(13).