Tidal modulation of Sr/Ca ratios in a Pacific reef coral


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dc.contributor.author Cohen, Anne L.
dc.contributor.author Sohn, Robert A.
dc.date.accessioned 2010-04-23T19:23:23Z
dc.date.available 2010-04-23T19:23:23Z
dc.date.issued 2004-08-21
dc.identifier.citation Geophysical Research Letters 31 (2004): L16310 en_US
dc.identifier.uri http://hdl.handle.net/1912/3310
dc.description Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 31 (2004): L16310, doi:10.1029/2004GL020600. en_US
dc.description.abstract The strontium-to-calcium ratio (Sr/Ca) of reef coral skeleton is an important tool for reconstructing past sea surface temperatures (SSTs). However, the accuracy of paleoSSTs derived from fossil coral Sr/Ca is challenged by evidence that physiological processes influence skeletal chemistry. Here we show that water level variations from tidal forcing are correlated with changes in coral Sr/Ca that cannot be accounted for by changes in SST. Ion microprobe measurements of Sr/Ca ratios in a Pacific Porites lutea reveal high-frequency variations at periods of ~6, ~10, and ~25 days. The relationship between Sr/Ca and temperature on these short timescales does not follow trends observed at longer periods, indicating that an additional forcing is required to explain our observations. We demonstrate that Sr/Ca is correlated with both tidal water level variations and SST, and that their contributions to the Sr/Ca content of the skeleton vary as a function of period. We propose that water level influences Sr/Ca indirectly via modulation of photosynthetically-active radiation (PAR) that drives large changes in zooxanthellate photosynthesis. en_US
dc.description.sponsorship This research was supported by WHOI Ocean Life Institute grant 25051316 to ALC; NSF grants EAR-9628749 and EAR-9904400 to the WHOI Northeast National Ion Microprobe Facility; DAMD 17-93-J-3052 supported ALC’s fieldwork on JA. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2004GL020600
dc.title Tidal modulation of Sr/Ca ratios in a Pacific reef coral en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2004GL020600

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