Seasonal variability of rainfall recorded in growth bands of the Giant African Land Snail Lissachatina fulica (Bowdich) from India

Rangarajan, Ravi and Ghosh, Prosenjit and Naggs, Fred (2013) Seasonal variability of rainfall recorded in growth bands of the Giant African Land Snail Lissachatina fulica (Bowdich) from India. In: CHEMICAL GEOLOGY, 357 . pp. 223-230.

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Abstract

Seasonal rainfall patterns in Bangalore, India, have been reconstructed using stable isotopic ratios in the growth bands of Giant African Land Snail shells. The present study was conducted at Bangalore, India which receives rain during the summer months. The oxygen isotopic record in the rainwater samples collected during different months covering the period of the summer monsoon of the year 2008 is compared with the isotopic ratio in the gastropod growth bands deposited simultaneously. The chronology of the shell growth band is independently established assuming the growth rate observed in a chamber experiment maintaining similar relative humidity and temperature conditions. A consistent pattern observed in the isotopic ratio in the gastropod growth bands and rainwater is demonstrated and provides a novel approach for precipitation reconstruction at seasonal and weekly time scales. This approach of using isotopic ratios in the gastropod growth bands for rainfall can serve as a substitute for filling gaps in rainfall data and for cases where no rain records are available. In addition, they can be used to determine the frequencies and magnitudes of dry spells from the past records. (C) 2013 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	CHEMICAL GEOLOGY
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	copyright for this article belongs to ELSEVIER SCIENCE BV NETHERLANDS
Keywords:	Monsoon; Gastropods; Dry spells; Enrichment
Department/Centre:	Division of Mechanical Sciences > Centre for Earth Sciences Division of Mechanical Sciences > Divecha Centre for Climate Change
Date Deposited:	26 Dec 2013 05:13
Last Modified:	26 Dec 2013 05:13
URI:	http://eprints.iisc.ac.in/id/eprint/47971

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