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

Tracing the strength of the southwest monsoon using boron isotopes in the eastern Arabian Sea
Tracing the strength of the southwest monsoon using boron isotopes in the eastern Arabian Sea
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 ?pCO2, the sea-air pCO2 difference, is relatively small during the last glacial maximum and becomes more negative toward the Holocene, with the exception of a significant excess during the last deglaciation centered on the Bølling-Ållerød. Throughout the record, ?pCO2 is predominantly negative, probably as a result of enhanced biological productivity (and higher nutrient and carbon utilization) during the southwest monsoon. A reduction in ?pCO2 during the last glacial maximum is therefore consistent with a reduction in the strength of this monsoon system.
Arabian Sea, Globigerinoides ruber, boron isotopes, monsoon, ?pCO2
0094-8276
1450-1458
Naik, Sushant S.
deaba64d-b2d9-45a4-8208-de9345f7a79a
Divakar Naidu, P.
a908f6bc-4483-4574-83ce-b297968e34a6
Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022
Martínez-Botí, Miguel A.
5d8a3d7c-bb00-467f-9fa4-1d9a6230697f
Naik, Sushant S.
deaba64d-b2d9-45a4-8208-de9345f7a79a
Divakar Naidu, P.
a908f6bc-4483-4574-83ce-b297968e34a6
Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022
Martínez-Botí, Miguel A.
5d8a3d7c-bb00-467f-9fa4-1d9a6230697f

Naik, Sushant S., Divakar Naidu, P., Foster, Gavin L. and Martínez-Botí, Miguel A. (2015) Tracing the strength of the southwest monsoon using boron isotopes in the eastern Arabian Sea. Geophysical Research Letters, 42 (5), 1450-1458. (doi:10.1002/2015GL063089).

Record type: Article

Abstract

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 ?pCO2, the sea-air pCO2 difference, is relatively small during the last glacial maximum and becomes more negative toward the Holocene, with the exception of a significant excess during the last deglaciation centered on the Bølling-Ållerød. Throughout the record, ?pCO2 is predominantly negative, probably as a result of enhanced biological productivity (and higher nutrient and carbon utilization) during the southwest monsoon. A reduction in ?pCO2 during the last glacial maximum is therefore consistent with a reduction in the strength of this monsoon system.

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More information

e-pub ahead of print date: 2015
Published date: 16 March 2015
Keywords: Arabian Sea, Globigerinoides ruber, boron isotopes, monsoon, ?pCO2
Organisations: Geochemistry

Identifiers

Local EPrints ID: 375299
URI: https://eprints.soton.ac.uk/id/eprint/375299
ISSN: 0094-8276
PURE UUID: 29f3e199-0394-470c-94b9-888ab8be6bb3

Catalogue record

Date deposited: 19 Mar 2015 10:09
Last modified: 17 Jul 2017 21:18

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