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The abrupt onset of the modern South Asian monsoon winds

DRS at CSIR-National Institute of Oceanography

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Title The abrupt onset of the modern South Asian monsoon winds
 
Creator Betzler, C.
Eberli, G.P.
Kroon, D.
Wright, J.D.
Swart, P.K.
Nath, B.N.
Alvarez-Zarikian, C.A.
Alonso-Garcia, M.
Bialik, O.M.
Blattler, C.L.
Guo, J.
Haffen, S.
Horozal, S.
Inoue, M.
Jovane, L.
Lanci, L.
Laya, J.C.
Mee, A.L.H.
Ludmann, T.
Nakakuni, M.
Niino, K.
Petruny, L.M.
Pratiwi, S.D.
Reijmer, J.J.G.
Reolid, J.
Slagle, A.L.
Sloss, C.R.
Su, X.
Yao, Z.
Young, J.R.
 
Subject METEOROLOGY AND CLIMATOLOGY
CHEMISTRY AND BIOGEOCHEMISTRY
METEOROLOGY AND CLIMATOLOGY
GEOLOGY AND GEOPHYSICS
 
Description The South Asian Monson (SAM) is one of the most intense climatic elements yet its initiation and variations are not well established. Dating the deposits of SAM wind-driven currents in IODP cores from the Maldives yields an age of 12.9 Ma indicating an abrupt SAM onset, over a short period of 300 kyrs. This coincided with the Indian Ocean Oxygen Minimum Zone expansion as revealed by geochemical tracers and the onset of upwelling reflected by the sediment’s content of particulate organic matter. A weaker ‘proto-monsoon’ existed between 12.9 and 25 Ma, as mirrored by the sedimentary signature of dust influx. Abrupt SAM initiation favors a strong influence of climate in addition to the tectonic control, and we propose that the post Miocene Climate Optimum cooling, together with increased continentalization and establishment of the bipolar ocean circulation, i.e. the beginning of the modern world, shifted the monsoon over a threshold towards the modern system
 
Date 2016-08-19T12:16:37Z
2016-08-19T12:16:37Z
2016
 
Type Journal Article
 
Identifier Scientific Reports, vol.6; 2016; no. 29838 doi: 10.1038/srep29838
http://drs.nio.org/drs/handle/2264/5004
 
Language en
 
Rights This is an open access article licensed under a Creative Commons Attribution 4.0 International License © Author(s) 2016.
 
Publisher Macmillan Publishers Limited