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Rainouts over the Arabian Sea and Western Ghats during moisture advection and recycling explain the isotopic composition of Bangalore summer rains

Rahul, P and Ghosh, Prosenjit and Bhattacharya, SK (2016) Rainouts over the Arabian Sea and Western Ghats during moisture advection and recycling explain the isotopic composition of Bangalore summer rains. In: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 121 (11). pp. 6148-6163.

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Official URL: http://dx.doi.org/10.1002/2015JD024579

Abstract

Variations in the isotope ratios (O-18/O-16 and D/H) of meteoric water at continental stations serve as valuable tracers for the hydrological cycle. In the present study, we investigated the role of sea surface temperature, wind speed, relative humidity, and rainout processes on the stable isotopic composition of the 2010 monsoon rainwater of Bangalore. The wind over the ocean influences the sea surface temperature and humidity which in turn influence the vapor isotopic composition. The rainout over the Arabian Sea and the land mass (Western Ghats) during advection of the air parcel to Bangalore and its recycling further modify the vapor composition. The isotopic ratios (delta O-18, delta D, and d-excess) of the precipitation at Bangalore was estimated following a Rayleigh fractionation model involving rainout and recycling processes yield values consistent with our observation. In some samples, however, the observed isotopic ratios are higher (by 2 to 5 parts per thousand), and a few of them are associated with high d-excess values. These discrepancies could be due to limitation of the model assumptions.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
Department/Centre: Division of Mechanical Sciences > Centre for Earth Sciences
Division of Mechanical Sciences > Divecha Centre for Climate Change
Depositing User: Id for Latest eprints
Date Deposited: 22 Oct 2016 06:52
Last Modified: 22 Oct 2016 06:52
URI: http://eprints.iisc.ac.in/id/eprint/54665

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