Yu, Jimin and Foster, Gavin L. and Elderfield, Henry and Broecker, Wallace S. and Clark, Elizabeth (2010) An evaluation of benthic foraminiferal B/Ca and δ11B for deep ocean carbonate ion and pH reconstructions. Earth and Planetary Science Letters, 293 (1-2). p. 114. ISSN 0012821X DOI https://doi.org/10.1016/j.epsl.2010.02.029
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Abstract
Reliable reconstructions of deep ocean carbonate ion concentration, [CO32−], and pH are crucial to understand mechanisms responsible for the past atmospheric CO2 variations observed in ice cores. However, it is challenging to reconstruct past deep water [CO32−] and pH and literature results from different proxies conflict, warranting careful investigations on possible reasons for the existing inconsistencies. Here, we present the first down core B/Ca and δ11B records measured in an epifaunal benthic foraminifer Cibicidoides wuellerstorfi from the Caribbean Sea during the last 160 kyr. The two proxies yield quantitatively comparable deep water [CO3 2−] and pH results, showing high values during glacials relative to inter-glacials (differences in [CO32−] and pH are ∼35 μmol/kg and ∼0.15, respectively), consistent with past ocean circulation changes in the Caribbean Sea. Our data provide convincing evidence that both proxies serve as faithful proxies to estimate deep ocean [CO32−] and pH, despite our incomplete understanding of boron incorporation into foraminiferal carbonates.
Item Type: | Article |
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Uncontrolled Keywords: | 09AREP; IA60; |
Subjects: | 01 - Climate Change and Earth-Ocean Atmosphere Systems |
Divisions: | 01 - Climate Change and Earth-Ocean Atmosphere Systems |
Journal or Publication Title: | Earth and Planetary Science Letters |
Volume: | 293 |
Page Range: | p. 114 |
Identification Number: | https://doi.org/10.1016/j.epsl.2010.02.029 |
Depositing User: | Sarah Humbert |
Date Deposited: | 25 May 2010 09:34 |
Last Modified: | 23 Jul 2013 09:57 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/1402 |
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