Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes
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, lea...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2019
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| Online Access: | https://hdl.handle.net/10356/84171 http://hdl.handle.net/10220/49142 |
| _version_ | 1811686095815966720 |
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| author | Murty, Sujata Annavarapu Bernstein, W. N. Ossolinski, J. E. Davis, R. S. Goodkin, Nathalie Fairbank Hughen, K. A. |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Murty, Sujata Annavarapu Bernstein, W. N. Ossolinski, J. E. Davis, R. S. Goodkin, Nathalie Fairbank Hughen, K. A. |
| author_sort | Murty, Sujata Annavarapu |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T04:54:58Z |
| format | Journal Article |
| id | ntu-10356/84171 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:54:58Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/841712020-09-26T21:29:46Z Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes Murty, Sujata Annavarapu Bernstein, W. N. Ossolinski, J. E. Davis, R. S. Goodkin, Nathalie Fairbank Hughen, K. A. Asian School of the Environment Interdisciplinary Graduate School (IGS) Earth Observatory of Singapore Porites Sr/Ca Science::Geology 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. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2019-07-05T02:04:28Z 2019-12-06T15:39:47Z 2019-07-05T02:04:28Z 2019-12-06T15:39:47Z 2018 Journal Article 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 2572-4517 https://hdl.handle.net/10356/84171 http://hdl.handle.net/10220/49142 10.1029/2017PA003276 en Paleoceanography and Paleoclimatology ©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. 14 p. application/pdf |
| spellingShingle | Porites Sr/Ca Science::Geology Murty, Sujata Annavarapu Bernstein, W. N. Ossolinski, J. E. Davis, R. S. Goodkin, Nathalie Fairbank Hughen, K. A. Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes |
| title | Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes |
| title_full | Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes |
| title_fullStr | Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes |
| title_full_unstemmed | Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes |
| title_short | Spatial and temporal robustness of Sr/Ca-SST calibrations in red sea corals : evidence for influence of mean annual temperature on calibration slopes |
| title_sort | spatial and temporal robustness of sr ca sst calibrations in red sea corals evidence for influence of mean annual temperature on calibration slopes |
| topic | Porites Sr/Ca Science::Geology |
| url | https://hdl.handle.net/10356/84171 http://hdl.handle.net/10220/49142 |
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