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18O depletion in monsoon rain relates to large scale organized convection rather than the amount of rainfall

Scientific reports, 2014-07, Vol.4 (1), p.5661-5661, Article 5661 [Peer Reviewed Journal]

Copyright Nature Publishing Group Jul 2014 ;Copyright © 2014, Macmillan Publishers Limited. All rights reserved 2014 Macmillan Publishers Limited. All rights reserved ;ISSN: 2045-2322 ;EISSN: 2045-2322 ;DOI: 10.1038/srep05661 ;PMID: 25012535

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  • Title:
    18O depletion in monsoon rain relates to large scale organized convection rather than the amount of rainfall
  • Author: Lekshmy, P R ; Midhun, M ; Ramesh, R ; Jani, R A
  • Subjects: Clouds ; Convection ; Rain ; Rainfall ; Wind
  • Is Part Of: Scientific reports, 2014-07, Vol.4 (1), p.5661-5661, Article 5661
  • Description: Oxygen isotopic variations in rainfall proxies such as tree rings and cave calcites from South and East Asia have been used to reconstruct past monsoon variability, mainly through the amount effect: the observed (18)O depletion of rain with increasing amount, manifested as a negative correlation of the monthly amount of tropical rain with its δ(18)O, both measured at the same station. This relation exhibits a significant spatial variability, and at some sites (especially North-East and peninsular India), the rainfall proxies are not interpretable by this effect. We show here that relatively higher (18)O-depletion in monsoon rain is not related necessarily to its amount, but rather, to large scale organized convection. Presenting δ(18)O analyses of ~654 samples of daily rain collected during summer 2012 across 9 stations in Kerala, southern India, we demonstrate that although the cross correlations between the amounts of rainfall in different stations is insignificant, the δ(18)O values of rain exhibit highly coherent variations (significant at P = 0.05). Significantly more (18)O-depletion in the rain is caused by clouds only during events with a large spatial extent of clouds observable over in the south eastern Arabian Sea.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2045-2322
    EISSN: 2045-2322
    DOI: 10.1038/srep05661
    PMID: 25012535
  • Source: PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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