CSIR Central

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

IR@NIO: CSIR-National Institute Of Oceanography, Goa


Field	Value

Creator	Naik, S.S. Naidu, P.D.

Date	2014-02-05T09:41:01Z 2014-02-05T09:41:01Z 2014

Identifier	Marine Micropaleontology, vol.107; 2014; 1-7. http://drs.nio.org/drs/handle/2264/4459

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, delta<sup>18</sup>O 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 pCO<sub>2</sub> proxy.

Language	en

Publisher	Elsevier

Rights	An edited version of this paper was published by Elsevier. Copyright [2013] Elsevier

Subject	boron isotopes calcium isotopes ratios palaeoclimate palaeoenvironments salinity surface temperature

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

Type	Journal Article