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Tracing the strength of the southwest monsoon using boron isotopes in the eastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Tracing the strength of the southwest monsoon using boron isotopes in the eastern Arabian Sea
 
Creator Naik, S.S.
Naidu, P.D.
Foster, G.L.
Martínez-Boti, M.A.
 
Subject PALAEO-STUDIES
PALAEO-STUDIES
 
Description Here we present the first boron isotope-based pCO2sw (pCO2 of seawater) reconstruction from the eastern Arabian Sea using the planktic foraminifera species Globigerinoides ruber. Our results from sediment core AAS9/21 show that pCO2sw varied between ~160 and 300 µatm during the last 23 kyr. The deltapCO2, the sea-air pCO2 difference, is relatively small during the last glacial maximum and becomes more negative towards the Holocene, with the exception of a significant excess during the last deglaciation centered on the Bølling-Ållerød. Throughout the record, deltapCO2 is predominantly negative, probably as a result of enhanced biological productivity (and higher nutrient and carbon utilization) during the southwest monsoon. A reduction in deltapCO2 during the last glacial maximum is therefore consistent with a reduction in the strength of this monsoon system.
 
Date 2015-08-24T09:40:20Z
2015-08-24T09:40:20Z
2015
 
Type Journal Article
 
Identifier Geophysical Research Letters, vol.42(5); 2015; 1450-1458
http://drs.nio.org/drs/handle/2264/4752
 
Language en
 
Rights An edited version of this paper was published by AGU. Copyright [2015] AGU. To view the published open abstract, go to http://dx.doi.org/10.1002/2015GL063089
 
Publisher American Geophysical Union