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Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea
 
Creator Chauhan, O.S.
Vogelsang, E.
Basavaiah, N.
Kader, U.S.A.
 
Subject southwest monsoon
Arabian Sea
palaeoclimate reconstruction
solar influx
 
Description From temporal variation in delta sup(18) O in Globigerinoides ruber and G. sacculifer and geochemical indices of weathering/erosion (chemical index of alteration, Al and Ti), we infer rapid southwest monsoon (SWM) deterioration with dwindling fluvial and detrital fluxes at ca. 450-650, 1000 and 1800-2200 cal. a BP during the late Holocene. We have evaluated the role of solar influx (reconstructed) and high-latitude climate variability (archived in GRIP and GISP-2 cores) on SWM precipitation. Broadly, our delta sup(18) O climate reconstruction is concordant with GRIP and GISP-2, and supports a teleconnection through atmospheric connection between the SWM and the North Atlantic climate - albeit temporal extents of the Little Ice Age and Medieval Warm Period from high latitude are not entirely coeval. Moreover, there is a humid climate and enhanced precipitation during the terminal stages of the Little Ice Age. The medieval warming (ca. AD 800-1300) is not synchronous either, and is punctuated by an arid event centred at 1000 a BP. Although the delineation of the specific influence of solar influx on SWM precipitation is elusive, we surmise that SWM precipitation is a complex phenomenon and local orography along southwestern India may have a role on the entrapment of moisture from the southwest trade winds, when these hit land
 
Date 2010-07-01T09:35:01Z
2010-07-01T09:35:01Z
2010
 
Type Journal Article
 
Identifier Journal of Quaternary Science, vol.25(5); 798-807
no
http://drs.nio.org/drs/handle/2264/3648
 
Language en
 
Relation J_Quat_Sci_25_798.jpg
 
Rights Copyright © 2009 John Wiley & Sons, Ltd. This is a preprint of an article published in [Journal of Quaternary Science, vol.25(5); 798-807]” and URL: http://dx.doi.org/10.1002/jqs.1359
 
Publisher John Wiley