Refining C. wuellerstorfi and H. elegans Mg/Ca temperature calibrations

Cappelli, Elena Lo Giudice, Regenberg, Marcus, Holbourn, Ann, Kuhnt, Wolfgang, Garbe-Schönberg, Dieter and Andersen, Nils (2015) Refining C. wuellerstorfi and H. elegans Mg/Ca temperature calibrations Marine Micropaleontology, 121 . pp. 70-84.

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Abstract

We present core top Mg/Ca, Sr/Ca and delta O-18 measurements for Cibicidoides wuellerstorfi and Hoeglundina elegans from the Timor Sea and the Makassar Strait, which span a bottom water temperature (BWT) range from 2 to 18 degrees C In both species Mg/Ca ratios are positively and significantly correlated with BWT, while delta O-18 measurements are significantly anti-correlated with BWT Comparison of calcification temperatures derived from Mg/Ca ratios and delta O-18 measurements yield comparable results and closely match LW-measured temperatures. We integrate our results with previously published data sets from the Atlantic, Indian and Pacific Oceans and provide temperature calibration equations over the temperature range from 2 to 12 degrees C for H. elegans and from 0 to 10 degrees C for C. wuellerstorfi. We found geographical differences in the relation of benthic Mg/Ca ratios to BWT: C. wuellerstorfi shows Mg/Ca sensitivity to BWT of 19% increase in Mg/Ca per degrees C for the Atlantic Ocean and of 15% per degrees C for the Indian and Pacific Oceans. H. elegans shows Mg/Ca sensitivity to BWT of 16% increase in Mg/Ca per degrees C for the Atlantic Ocean and of 14% per degrees C for the Indian and Pacific Oceans. C wuellerstorfi Sr/Ca variability appears to be mainly driven by carbonate ion saturation, whereas H. elegans Sr/Ca variability is closely linked to BWT in the compiled data sets from the Atlantic, Indian and Pacific Oceans. (C) 2015 Elsevier B.V. All rights reserved.

Document Type: Article
Additional Information: Times Cited: 0
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
OceanRep > The Future Ocean - Cluster of Excellence > FO-R09
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University > Other > Leibniz-Laboratory for Radiometric Dating and Isotope Research
Refereed: Yes
ISSN: 0377-8398
Projects: Future Ocean
Date Deposited: 20 Oct 2016 10:58
Last Modified: 27 Feb 2017 15:18
URI: http://eprints.uni-kiel.de/id/eprint/32434

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