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Title: Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes
Authors: Murty, Sujata Annavarapu
Bernstein, W. N.
Ossolinski, J. E.
Davis, R. S.
Goodkin, Nathalie Fairbank
Hughen, K. A.
Keywords: Porites
Issue Date: 2018
Source: Murty, S. A., Bernstein, W. N., Ossolinski, J. E., Davis, R. S., Goodkin, N. F., & Hughen, K. A. (2018). Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes. Paleoceanography and Paleoclimatology, 33(5), 443-456. doi:10.1029/2017PA003276
Series/Report no.: Paleoceanography and Paleoclimatology
Abstract: Sr/Ca ratios recorded in the aragonite skeleton of massive coral colonies are commonly used to reconstruct seasonal‐ to centennial‐scale variability in sea surface temperature (SST). While the Sr/Ca paleothermometer is robust in individual colonies, Sr/Ca‐SST relationships between colonies vary, leading to questions regarding the utility of the proxy. We present biweekly‐resolution calibrations of Sr/Ca from five Porites spp. corals to satellite SST across 10° of latitude in the Red Sea to evaluate the Sr/Ca proxy across both spatial and temporal scales. SST is significantly correlated with coral Sr/Ca at each site, accounting for 69–84% of Sr/Ca variability (P ≪ 0.01). Intercolony variability in Sr/Ca‐SST sensitivities reveals a latitudinal trend, where calibration slopes become shallower with increasing mean annual temperature. Mean annual temperature is strongly correlated with the biweekly‐resolution calibration slopes across five Red Sea sites (r2 = 0.88, P = 0.05), while also correlating significantly to Sr/Ca‐SST slopes for 33 Porites corals from across the entire Indo‐Pacific region (r2 = 0.26, P < 0.01). Although interannual summer, winter, and mean annual calibrations for individual Red Sea colonies are inconsistently robust, combined multicoral calibrations are significant at summer (r2 = 0.53, P ≪ 0.01), winter (r2 = 0.62, P ≪ 0.01), and mean annual time scales (r2 = 0.79, P ≪ 0.01). Our multicoral, multisite study indicates that the Sr/Ca paleothermometer is accurate across both temporal and spatial scales in the Red Sea and also potentially explains for the first time variability in Sr/Ca‐SST calibration slopes across the Indo‐Pacific region. Our study provides strong evidence supporting the robustness of the coral Sr/Ca proxy for examining seasonal to multicentury variability in global climate phenomena.
ISSN: 2572-4517
DOI: 10.1029/2017PA003276
Rights: ©2018. The Author(s). This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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