Stable strontium isotopes (δ88/86Sr) in cold-water corals — A new proxy for reconstruction of intermediate ocean water temperatures

Rüggeberg, Andres, Fietzke, Jan, Liebetrau, Volker, Eisenhauer, Anton, Dullo, Wolf-Christian and Freiwald, André (2008) Stable strontium isotopes (δ88/86Sr) in cold-water corals — A new proxy for reconstruction of intermediate ocean water temperatures Earth and Planetary Science Letters, 269 . pp. 570-575. DOI 10.1016/j.epsl.2008.03.002.

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Supplementary data:

Abstract

Zooxanthellate scleractinian corals are known as archives for temporal variations of climate variables, such as sea surface temperature, salinity or productivity. The use of azooxanthellate cold-water corals as potential archives for intermediate water mass properties and climate variability was tested recently. However, the correlation of established proxies such as delta O-18 and delta C-13 with temperature is difficult since there is no direct temperature equation applicable as in shallow-water corals. Other temperature proxies such as Sr/Ca, Mg/Ca and U/Ca are influenced by the complex microstructure of the aragonite skeleton, the rate of calcification, and other vital effects observed for coral species. For the first time we show that the stable strontium isotope ratio delta Sr-88/86 incorporated in the skeletons of the cold-water coral species Lophelia pertusa portrays the ambient seawater temperature. The temperature sensitivity from live samples collected along the European continental margin covering a temperature range from 6 degrees to 10 degrees C is 0.026 +/- 0.003%omicron/degrees C (2 sigma standard error) which is a sensitivity similar to the tropical shallow-water coral record of Pavona clavata. This indicates a similar fractionation process of strontium for both, zooxanthellate and azooxanthellate corals. For coral aragonite the delta Sr-88/86 ratio may serve as a new paleo-temperature proxy and introduces new perspectives in paleoceanography with respect to intermediate water dynamics. (C) 2008 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: Corals; Paleoceanography; stable strontium isotopes, cold water coral, Lophelia pertusa, temperature reconstruction, temperature proxy, intermediate waters, MC-ICP-MS, POSEIDON, POS292, POS325, METEOR, M61/1; M61/3, ALKOR, AL275, JAGO
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1016/j.epsl.2008.03.002
ISSN: 0012-821X
Projects: TRISTAN, CASIOPEIA, HERMES, MOUNDFORCE, GEOTECHNOLOGIEN, Future Ocean
Expeditions/Models:
Date Deposited: 03 Dec 2008 16:52
Last Modified: 02 Feb 2017 08:11
URI: http://eprints.uni-kiel.de/id/eprint/3851

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