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Boron/calcium ratios in Globigerinoides ruber from the Arabian Sea: Implications for controls on boron incorporation

DRS at CSIR-National Institute of Oceanography

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Title Boron/calcium ratios in Globigerinoides ruber from the Arabian Sea: Implications for controls on boron incorporation
 
Creator Naik, S.S.
Naidu, P.D.
 
Subject boron isotopes
calcium isotopes
ratios
palaeoclimate
palaeoenvironments
salinity
surface temperature
 
Description Culture and downcore studies have been used to argue that B/Ca ratios in planktic foraminifera are correlated with seawater pH and may record seawater borate/bicarbonate ratios, although other factors may also control B/Ca. Specimens of Globigerinoides ruber from the Ocean Drilling Program (ODP) Site 723A (western Arabian Sea) and Core AAS9/21 (eastern Arabian Sea) from the last 22 kyr were analysed for B/Ca, delta18O and Mg/Ca. B/Ca was compared to reconstructed salinity and sea surface temperature (SST) records, to gain insight into the processes controlling the incorporation of boron. In both cores, B/Ca and Mg/Ca are positively correlated which suggests that temperature governs the incorporation of boron in G. ruber to some extent. Higher B/Ca ratios at the site affected by upwelling (ODP 723A) than in the non-upwelling region (Core AAS9/21), and a positive correlation between B/Ca and shell size in G. ruber are observed. We observe no significant correlation between B/Ca in G. ruber and salinity, pH or dissolved inorganic carbon (DIC) in either the western or eastern Arabian Sea which throws considerable doubt on the utility of B/Ca ratios as a pH or pCO2 proxy.
 
Date 2014-02-05T09:41:01Z
2014-02-05T09:41:01Z
2014
 
Type Journal Article
 
Identifier Marine Micropaleontology, vol.107; 2014; 1-7.
http://drs.nio.org/drs/handle/2264/4459
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2013] Elsevier
 
Publisher Elsevier