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Indian summer monsoon and winter hydrographic variations over past millennia resolved by clay sedimentation

DRS at CSIR-National Institute of Oceanography

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Title Indian summer monsoon and winter hydrographic variations over past millennia resolved by clay sedimentation
 
Creator Chauhan, O.S.
Dayal, A.M.
Basavaiah, N.
Kader, U.S.A.
 
Subject Indian summer monsoon
winter hydrography
clay sedimentation
palaeo studies
 
Description Reconstruction of century-scale Indian monsoon and winter hydrography is made from an AMS-dated core located in the unique region of the southeast Arabian Sea which lies in the pathways of the low salinity Bay of Bengal Waters, advecting during winter northeast monsoon (NEM). Based upon clay mineral analyses in seawaters, we identify chlorite and kaolinite as specific clays supplied by the Bay of Bengal waters and local fluvial flux (by the southwest monsoon (SWM) precipitation from the Peninsular India), respectively, along the southwest continental margin of India. An evaluation of clay flux and delta sup(18) O in G. ruber portrays century-scale weaker SWM precipitation events during approx. 450-650 yr, approx. 1000 yr, and 1800-2200 cal yr BP. Kaolinite wt % and flux were found to be low during all these events, though chlorite had a persistent or enhanced flux. From the enhanced flux of chlorite and reduced kaolinite/chlorite ratio, during weaker phases of SWM, we deduce a stronger NEM (winter hydrography), implying an inverse coupling between the summer and the winter monsoon.
 
Date 2010-10-07T08:57:59Z
2010-10-07T08:57:59Z
2010
 
Type Journal Article
 
Identifier Geochemistry, Geophysics, Geosystems, vol.11(9); 12 pp; doi:10.1029/2010GC003067
no
http://drs.nio.org/drs/handle/2264/3721
 
Language en
 
Relation Geochem_Geophys_Geosyst_11_12pp.jpg
 
Rights An edited version of this paper was published by AGU. Copyright [2010] AGU. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
 
Publisher American Geophysical Union