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Equatorial Indian Ocean productivity during the last 33 kyr and possible linkage to Westerly Jet variability

DRS at CSIR-National Institute of Oceanography

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Title Equatorial Indian Ocean productivity during the last 33 kyr and possible linkage to Westerly Jet variability
 
Creator Punyu, V.R.
Banakar, V.K.
Garg, A.
 
Subject palaeoclimate
holocene
equatorial westerlies
phytoplankton
primary production
organic matter
radiocarbon dating
 
Description The top 1 m radiocarbon dated section of a 5.6 m long sediment core retrieved from the Equatorial Indian Ocean is studied for productivity changes in response to climate variability that have taken place during the last ~33 kyr. The robust indicators of marine productivity such as phytol and brassicasterol exhibit distinctly higher contents (av.5.8 ng/g and 4.8 ng/g respectively) during the LGM (25–17 ky BP) as compared to the succeeding period (16–5 ky BP: av.1.9 ng/g each) and preceding period (33–25 ky BP: av.1.8 and 0.8 ng/g respectively) which suggest increased productivity during the cold and dry climate of the LGM. The Corgcontent is also relatively higher during this period than the warmer Holocene. However, marginally higher C/N ratios (~7.8) and enrichment of delta13 Corg(~-19.8‰) during the LGM than the Holocene (C/N ~6.4 and delta13 Corg~- 21.5‰), and also the higher carbon preference index (CPI) of n-alkanes and n-alkanols together suggest the presence of terrestrial organic matter in the sediment. The increased equatorial productivity and terrestrial organic matter input together during the LGM may indicate intensified inter-monsoon equatorial Westerly Jets resulting in elevated productivity
 
Date 2014-02-05T09:39:59Z
2014-02-05T09:39:59Z
2014
 
Type Journal Article
 
Identifier Marine Geology, vol.348; 2014; 44-51.
no
http://drs.nio.org/drs/handle/2264/4458
 
Language en
 
Relation —
 
Rights An edited version of this paper was published by Elsevier. Copyright [2013] Elsevier
 
Publisher Elsevier