Record Details

Climatology of the Eastern Arabian Sea during the last glacial cycle reconstructed from paired measurement of foraminiferal delta sup(18)O and Mg/Ca

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Climatology of the Eastern Arabian Sea during the last glacial cycle reconstructed from paired measurement of foraminiferal delta sup(18)O and Mg/Ca
 
Creator Banakar, V.K.
Mahesh, B.S.
Burr, G.
Chodankar, A.R.
 
Subject Palaeoclimate
Surface salinity
Oxygen isotopes
Arabian Sea
 
Description Paired measurements of Mg/Ca and delta sup(18)O of Globigerenoides sacculifer from an Eastern Arabian Sea (EAS) sediment core indicate that sea-surface temperature (SST) varied within 2 degrees C and sea-surface salinity within 2 psu during the last 100 ka. SST was coldest (approx. 27 degrees C) during Marine Isotope Stage (MIS) 4 and 2. Sea-surface salinity was highest (approx. 37.5 psu) during most of the last glacial period (approx. 60-18 ka), concurrent with increased delta sup(18)O sub(G. sacculifer) and C/N ratios of organic matter and indicative of sustained intense winter monsoons. SST time series are influenced by both Greenland and Antarctic climates. However, the seasurface salinity time series and the deglacial warming in the SST record (beginning at approx. 18 ka) compare well with the LR04 benthic delta sup(18)O-stack and Antarctic temperatures. This suggests a teleconnection between the climate in the Southern Hemisphere and the EAS. Therefore, the last 100-ka variability in EAS climatology appears to have evolved in response to a combination of global climatic forcings and regional monsoons. The most intense summer monsoons within the Holocene occurred at approx. 8 ka and are marked by SST cooling of approx. 1 degrees C, sea-surface salinity decrease of 0.5 psu, and delta sup(18)O sub(G. sacculifer) decrease of 0.2 ppt.
 
Date 2010-04-27T05:07:12Z
2010-04-27T05:07:12Z
2010
 
Type Journal Article
 
Identifier Quaternary Research, vol.73(3); 535-540
no
http://drs.nio.org/drs/handle/2264/3592
 
Language en
 
Relation Quat_Res_73_535.jpg
 
Rights An edited version of this paper was published by Elsevier. Copyright [2010] Elsevier
 
Publisher Elsevier