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Carbonate clumped isotope variability in shallow water corals: Temperature dependence and growth-related vital effects

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dc.contributor Univ Bremen
dc.contributor Yale Univ
dc.contributor Yale University
dc.contributor University Of Western Australia
dc.contributor Marum Ctr Marine Environm Sci
dc.contributor Univ Western Australia
dc.contributor Australian Inst Marine Sci
dc.contributor California Institute Of Technology
dc.contributor Div Geol & Planetary Sci
dc.contributor University Of Bremen
dc.contributor Dept Geol & Geophys
dc.contributor Australian Institute Of Marine Science
dc.contributor Caltech
dc.contributor Australian Institute Of Marine Science (aims) en
dc.contributor.author HOLCOMB, MICHAEL
dc.contributor.author SAENGER, CASEY
dc.contributor.author AFFEK, HAGIT P.
dc.contributor.author FELIS, THOMAS
dc.contributor.author THIAGARAJAN, NIVEDITA
dc.contributor.author LOUGH, JANICE M.
dc.date.accessioned 2013-02-28T06:55:37Z
dc.date.accessioned 2013-02-28T06:55:37Z
dc.date.accessioned 2017-03-21T01:09:36Z
dc.date.accessioned 2018-11-01T03:13:27Z
dc.date.available 2013-02-28T06:55:37Z
dc.date.available 2017-03-21T01:09:36Z
dc.date.available 2017-03-21T01:09:36Z
dc.date.available 2018-11-01T03:13:27Z
dc.date.issued 2012-12-15
dc.identifier 9147 en
dc.identifier.citation Saenger C, Affek HP, Felis T, Thiagarajan N, Lough JM and Holcomb M (2012) Carbonate clumped isotope variability in shallow water corals: temperature dependence and growth-related vital effects. Geochimica et Cosmochimica Acta. 99: 224-242. en
dc.identifier.issn 0016-7037
dc.identifier.uri http://epubs.aims.gov.au/11068/9147
dc.description.abstract Geochemical variations in shallow water corals provide a valuable archive of paleoclimatic information. However, biological effects can complicate the interpretation of these proxies, forcing their application to rely on empirical calibrations. Carbonate clumped isotope thermometry (Delta(47)) is a novel paleotemperature proxy based on the temperature dependent "clumping" of C-13-O-18 bonds. Similar Delta(47)-temperature relationships in inorganically precipitated calcite and a suite of biogenic carbonates provide evidence that carbonate clumped isotope variability may record absolute temperature without a biological influence. However, large departures from expected values in the winter growth of a hermatypic coral provided early evidence for possible Delta(47) vital effects. Here, we present the first systematic survey of Delta(47) in shallow water corals. Sub-annual Red Sea Delta(47) in two Porites corals shows a temperature dependence similar to inorganic precipitation experiments, but with a systematic offset toward higher Delta(47) values that consistently underestimate temperature by similar to 8 degrees C. Additional analyses of Porites, Siderastrea, Astrangia and Caryophyllia corals argue against a number of potential mechanisms as the leading cause for this apparent Delta(47) vital effect including: salinity, organic matter contamination, alteration during sampling, the presence or absence of symbionts, and interlaboratory differences in analytical protocols. However, intra-and inter-coral comparisons suggest that the deviation from expected Delta(47) increases with calcification rate. Theoretical calculations suggest this apparent link with calcification rate is inconsistent with pH-dependent changes in dissolved inorganic carbon speciation and with kinetic effects associated with CO2 diffusion into the calcifying space. However, the link with calcification rate may be related to fractionation during the hydration/hydroxylation of CO2 within the calcifying space. Although the vital effects we describe will complicate the interpretation of Delta(47) as a paleothermometer in shallow water corals, it may still be a valuable paleoclimate proxy, particularly when applied as part of a multi-proxy approach. (C) 2012 Elsevier Ltd. All rights reserved.
dc.description.sponsorship We thank Gerry Olack, Dominic Colosi and Glendon Hunsinger of the Yale Earth System Center for Stable Isotopic Studies for their laboratory assistance. Also thanks to members of the Affek lab for discussion and access to their data. Daniel Schrag, Jess Adkins and Robert Halley generously donated coral samples. Eric Matson and Eric Lazo-Wasem provided valuable logistical support. This work was supported by the NOAA Climate and Global Change Postdoctoral Program for C.S. and National Science Foundation Grant NSF-EAR-0842482 to H.P.A. T.F. is supported by the DFG-Research Center/Excellence Cluster "The Ocean in the Earth System".
dc.description.uri http://www.sciencedirect.com/science/article/pii/S0016703712005418 en
dc.language English
dc.language en en
dc.relation.ispartof Geochimica et Cosmochimica Acta - pages: 99: 224-242 en
dc.relation.ispartof Null
dc.subject Pleistocene Temperatures
dc.subject Biological Carbonates
dc.subject Oxygen Isotopes
dc.subject Galaxea-fascicularis
dc.subject Geochemistry & Geophysics
dc.subject Red-sea
dc.subject Astrangia-poculata
dc.subject Synthetic Aragonite
dc.subject Experimental Ecology
dc.subject Deep-sea Corals
dc.subject Scleractinian Corals
dc.title Carbonate clumped isotope variability in shallow water corals: Temperature dependence and growth-related vital effects
dc.type journal article en
dc.identifier.doi 10.1016/j.gca.2012.09.035
dc.identifier.wos WOS:000311345200015


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