Abrupt weakening of the Indian summer monsoon at 8.2 kyr B.P.

Dixit, Yama and Hodell, David A. and Sinha, Rajiv and Petrie, Cameron A. (2014) Abrupt weakening of the Indian summer monsoon at 8.2 kyr B.P. Earth and Planetary Science Letters, 391. pp. 16-23. ISSN 0012-821X DOI 10.1016/j.epsl.2014.01.026

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Abstract

An oxygen isotope record of biogenic carbonate from paleolake Riwasa in northwestern (NW) India provides a history of the Indian Summer Monsoon (ISM) from ∼11 to 6 kyr B.P. The lake was dry throughout the Late Glacial period when aeolian sands were deposited. Lacustrine sedimentation commenced in the early Holocene and the lake deepened significantly at ∼9.4 kyr B.P., indicating a strengthening of the ISM in response to summer insolation forcing. This high lake stand was interrupted by an abrupt desiccation, which is marked by a 12-cm limestone hardground that formed during a period of sub-aerial exposure after ∼8.3 kyr B.P. The base of the hardground surface coincides with the beginning of the ‘8.2-kyr B.P. cooling event’ in the North Atlantic that has been associated with a glacial outburst flood and slowdown of Atlantic meridional overturning circulation. The hardground provides robust evidence of a weakening of the ISM on the Indian subcontinent at ∼8.2 kyr B.P., and supports previous results of a strong teleconnection between monsoon Asia and North Atlantic climate. Lacustrine sedimentation resumed at ∼7.9 kyr B.P. suggesting the 8.2-kyr desiccation of paleolake Riwasa represented an abrupt response of the ISM to forcing from the North Atlantic.

Item Type: Article
Additional Information: Copyright © 2014 The Authors
Uncontrolled Keywords: 2013AREP; IA67; OA;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 07 - Gold Open Access
01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Earth and Planetary Science Letters
Volume: 391
Page Range: pp. 16-23
Identification Number: 10.1016/j.epsl.2014.01.026
Depositing User: Sarah Humbert
Date Deposited: 21 Mar 2014 19:09
Last Modified: 13 Jul 2014 17:09
URI: http://eprints.esc.cam.ac.uk/id/eprint/2988

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