Improving SST reconstructions from coral Sr/Ca records: multiple corals from Tahiti (French Polynesia) |
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| Authors: | Sri Yudawati Cahyarini Miriam Pfeiffer W-Chr Dullo |
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| Institution: | 1.Leibniz Institut fuer Meereswissenschaften,IFM-GEOMAR,Kiel,Germany;2.Research Centre for Geotechnology,LIPI,Bandung,Indonesia;3.Institut für Geologie und Mineralogie,Universit?t K?ln,K?ln,Germany |
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| Abstract: | We reconstruct SST from coral Sr/Ca ratios measured at three coral cores taken from the lagoon of Tahiti (French Polynesia).
Two coral cores were drilled from the same coral colony (one horizontally and one vertically), and a third core was drilled
vertically from another coral growing at a different site. We evaluate several Sr/Ca records as proxies for regional SST variations:
(1) the three single-core records from Tahiti, (2) an average Sr/Ca record computed from the two cores drilled from the same
coral colony, (3) an average Sr/Ca record computed from all three Tahiti cores, and (4) an average Sr/Ca record computed from
the three Tahiti cores and a fourth core taken from a different island (Rarotonga). On a monthly scale, the average Sr/Ca
record including the four coral cores from Tahiti and Rarotonga shows the best correlation with regional SST. The variance
of the SST reconstruction is very realistic and the residual SST is low. This suggests that reconstructing SST from average
proxy records gives a better representation of regional SST variations. Of the three Tahiti cores, the one that was drilled
horizontally shows the best correlation with grid-SST on an annual mean scale. All three Tahiti corals show much larger interannual
SST variations than that indicated by grid-SST. |
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| Keywords: | Sea surface temperature Sr/Ca Coral proxies |
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