Calcite saturation, foraminiferal test mass, and Mg/Ca-based temperatures dissolution corrected using XDX—A 150 ka record from the western Indian Ocean

Johnstone, Heather J. H. and Kiefer, Thorsten and Elderfield, Henry and Schulz, Michael (2014) Calcite saturation, foraminiferal test mass, and Mg/Ca-based temperatures dissolution corrected using XDX—A 150 ka record from the western Indian Ocean. Geochemistry, Geophysics, Geosystems, 15 (3). pp. 781-797. ISSN 1525-2027 DOI 10.1002/2013GC004994

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2013GC0...

Abstract

A record of deep-sea calcite saturation inline image, derived from X-ray computed tomography-based foraminifer dissolution index, XDX, was constructed for the past 150 ka for a core from the deep (4157 m) tropical western Indian Ocean. G. sacculifer and N. dutertrei recorded a similar dissolution history, consistent with the process of calcite compensation. Peaks in calcite saturation (∼15 µmol/kg higher than the present-day value) occurred during deglaciations and early in MIS 3. Dissolution maxima coincided with transitions to colder stages. The mass record of G. sacculifer better indicated preservation than did that of N. dutertrei or G. ruber. Dissolution-corrected Mg/Ca-derived SST records, like other SST records from marginal Indian Ocean sites, showed coolest temperatures of the last 150 ka in early MIS 3, when mixed layer temperatures were ∼4°C lower than present SST. Temperatures recorded by N. dutertrei showed the thermocline to be ∼4°C colder in MIS 3 compared to the Holocene (8 ka B.P.).

Item Type: Article
Additional Information: © 2014. American Geophysical Union.
Uncontrolled Keywords: 2014AREP; IA67;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
08 - Green Open Access
Journal or Publication Title: Geochemistry, Geophysics, Geosystems
Volume: 15
Page Range: pp. 781-797
Identification Number: 10.1002/2013GC004994
Depositing User: Sarah Humbert
Date Deposited: 02 May 2014 10:40
Last Modified: 30 Sep 2014 00:00
URI: http://eprints.esc.cam.ac.uk/id/eprint/3036

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