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Intensified monsoon and spatiotemporal changes in precipitation patterns in the NW Himalaya during the early-mid Holocene

Anoop, A and Prasad, S and Krishnan, R and Naumann, R and Dulski, P (2013) Intensified monsoon and spatiotemporal changes in precipitation patterns in the NW Himalaya during the early-mid Holocene. Quaternary International, 313-14. pp. 74-84.

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Abstract

We have undertaken a high resolution palaeoclimate reconstruction on radiocarbon dated palaeolake sediments from the Spiti valley, NW Himalaya. This site lies in the climatically sensitive winter westerlies and Indian Summer Monsoon (ISM) transitional regime and provides an opportunity to reconstruct the precipitation seasonality, and extreme precipitation events that are characterised by intensified erosion. The lake sediments reveal distinct lithofacies that provide evidence of changes in depositional environment and climate during early to mid Holocene (8.7-6.1calkaBP). We have identified three stages during the period of lake's existence: the Stage I (8.7-7.6calkaBP) is marked by lake establishment; Stage II (~7.6-6.8calkaBP) by sustained cooler periods and weakened summer monsoon, and Stage III (~6.8-6.1calkaBP) by a shift from colder to warmer climate with stronger ISM. We have identified several short term cooler periods at ca. 8.7, 8.5, 8.3 and 7.2-6.9calkaBP. Based on an overview of regional climate records we show that there is an abrupt switch in precipitation seasonality ca. 6.8calkaBP that is followed by the onset of the intensified monsoon in the NW Himalaya.

Item Type: Article
Additional Information: Copyrights of this article belongs to Elsevier.
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 20 Jun 2014 10:25
Last Modified: 20 Jun 2014 10:25
URI: http://moeseprints.incois.gov.in/id/eprint/270

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