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dc.contributor.authorDeCarlo, Thomas M.  Concept link
dc.contributor.authorGaetani, Glenn A.  Concept link
dc.contributor.authorCohen, Anne L.  Concept link
dc.contributor.authorFoster, Gavin L.  Concept link
dc.contributor.authorAlpert, Alice  Concept link
dc.contributor.authorStewart, Joseph A.  Concept link
dc.date.accessioned2016-08-11T17:19:39Z
dc.date.available2016-12-11T09:43:57Z
dc.date.issued2016-06-11
dc.identifier.citationPaleoceanography 31 (2016): 626–638en_US
dc.identifier.urihttps://hdl.handle.net/1912/8233
dc.descriptionAuthor Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 31 (2016): 626–638, doi:10.1002/2015PA002908.en_US
dc.description.abstractCoral skeletons archive past climate variability with unrivaled temporal resolution. However, extraction of accurate temperature information from coral skeletons has been limited by “vital effects,” which confound, and sometimes override, the temperature dependence of geochemical proxies. We present a new approach to coral paleothermometry based on results of abiogenic precipitation experiments interpreted within a framework provided by a quantitative model of the coral biomineralization process. DeCarlo et al. (2015a) investigated temperature and carbonate chemistry controls on abiogenic partitioning of Sr/Ca and U/Ca between aragonite and seawater and modeled the sensitivity of skeletal composition to processes occurring at the site of calcification. The model predicts that temperature can be accurately reconstructed from coral skeleton by combining Sr/Ca and U/Ca ratios into a new proxy, which we refer to hereafter as the Sr-U thermometer. Here we test the model predictions with measured Sr/Ca and U/Ca ratios of 14 Porites sp. corals collected from the tropical Pacific Ocean and the Red Sea, with a subset also analyzed using the boron isotope (δ11B) pH proxy. Observed relationships among Sr/Ca, U/Ca, and δ11B agree with model predictions, indicating that the model accounts for the key features of the coral biomineralization process. By calibrating to instrumental temperature records, we show that Sr-U captures 93% of mean annual temperature variability (26–30°C) and has a standard deviation of prediction of 0.5°C, compared to 1°C using Sr/Ca alone. The Sr-U thermometer may offer significantly improved reliability for reconstructing past ocean temperatures from coral skeletons.en_US
dc.description.sponsorshipNSF Grant Numbers: OCE-1338320, OCE-1031971, OCE-1220529; NSF Graduate Research Fellowshipsen_US
dc.language.isoen_USen_US
dc.publisherJohn WIley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2015PA002908
dc.subjectCoralen_US
dc.subjectPaleoclimateen_US
dc.subjectSea surface temperatureen_US
dc.subjectGeochemistryen_US
dc.subjectBiomineralizationen_US
dc.titleCoral Sr-U thermometryen_US
dc.typeArticleen_US
dc.description.embargo2016-12-11en_US
dc.identifier.doi10.1002/2015PA002908


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