Twentieth century warming of the tropical Atlantic captured by Sr-U paleothermometry Alpert, Alice Cohen, Anne L. Oppo, Delia W. DeCarlo, Thomas M. Gaetani, Glenn A. Hernandez-Delgado, Edwin A. Winter, Amos Gonneea, Meagan E. 2017-04-10T19:45:02Z 2017-08-16T08:42:22Z 2017-02-16
dc.description Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 32 (2017): 146–160, doi:10.1002/2016PA002976. en_US
dc.description.abstract Coral skeletons are valuable archives of past ocean conditions. However, interpretation of coral paleotemperature records is confounded by uncertainties associated with single-element ratio thermometers, including Sr/Ca. A new approach, Sr-U, uses U/Ca to constrain the influence of Rayleigh fractionation on Sr/Ca. Here we build on the initial Pacific Porites Sr-U calibration to include multiple Atlantic and Pacific coral genera from multiple coral reef locations spanning a temperature range of 23.15–30.12°C. Accounting for the wintertime growth cessation of one Bermuda coral, we show that Sr-U is strongly correlated with the average water temperature at each location (r2 = 0.91, P < 0.001, n = 19). We applied the multispecies spatial calibration between Sr-U and temperature to reconstruct a 96 year long temperature record at Mona Island, Puerto Rico, using a coral not included in the calibration. Average Sr-U derived temperature for the period 1900–1996 is within 0.12°C of the average instrumental temperature at this site and captures the twentieth century warming trend of 0.06°C per decade. Sr-U also captures the timing of multiyear variability but with higher amplitude than implied by the instrumental data. Mean Sr-U temperatures and patterns of multiyear variability were replicated in a second coral in the same grid box. Conversely, Sr/Ca records from the same two corals were inconsistent with each other and failed to capture absolute sea temperatures, timing of multiyear variability, or the twentieth century warming trend. Our results suggest that coral Sr-U paleothermometry is a promising new tool for reconstruction of past ocean temperatures. en_US
dc.description.embargo 2017-08-16 en_US
dc.description.sponsorship NSF Graduate Research Fellowships Grant Numbers: NSF-OCE-1338320, NSF-OCE-1031971, NSF-OCE-0926986; WHOI Access to the Sea Grant Numbers: 27500056, 0734826; NSF HRD; UPR Central Administration to EAHD through the Center for Applied Tropical Ecology and Conservation of UPR en_US
dc.identifier.citation Paleoceanography 32 (2017): 146–160 en_US
dc.identifier.doi 10.1002/2016PA002976
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.subject Coral en_US
dc.subject Temperature en_US
dc.subject Paleoceangraphy en_US
dc.subject Paleothermometry en_US
dc.subject Global warming en_US
dc.subject Biomineralization en_US
dc.title Twentieth century warming of the tropical Atlantic captured by Sr-U paleothermometry en_US
dc.type Article en_US
dspace.entity.type Publication
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