首页|A multi-proxy (delta Ca-44/40, Sr/Ca, and Delta(47)) study of fish otoliths for determination of seawater temperature
A multi-proxy (delta Ca-44/40, Sr/Ca, and Delta(47)) study of fish otoliths for determination of seawater temperature
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NSTL
Elsevier
Fish otoliths are valuable archives for paleotemperature studies. In this study, we have measured delta Ca-44/40, Sr/Ca, Mg/Ca, and Ba/Ca ratios in six fish otolith samples of four different species from water with different annual average temperatures ranging from 2 degrees C to 25 degrees C. We demonstrate that the delta Ca-44/40 values of fish otoliths can be used as a temperature proxy. The temperature sensitivity of delta Ca-44/40 in fish otoliths is 0.036 parts per thousand/degrees C which suggests that with the current analytical uncertainty of +/- 0.08 parts per thousand for delta Ca-44/40 measurements, we can resolve temperature changes of +/- 2 degrees C. The Sr/Ca ratio of fish otoliths also shows a negative correlation with water temperature. In addition, both delta Ca-44/40 values and Sr/Ca of fish otoliths display linear correlations with published delta O-18 and Delta(47) measured in the same otolith powder samples. This study further demonstrates that simultaneous measurements of delta Ca-44/40, Sr/Ca, and Delta(47) in fish otoliths can be used for robust paleotemperature reconstruction. Using a multi-regression approach, a multi proxy calibration equation is proposed (T(K) = 5.43 x Sr/Ca - 16.8 x delta Ca-44/40 - 484.6 x Delta(47) + 580.9) by combining the delta Ca-44/40, Sr/Ca, and Delta(47) values in the fish otolith samples, which results in a low uncertainty of temperature estimation of +/- 0.9 degrees C. However, the temperature sensitivity of Mg/Ca and Ba/Ca ratios in fish otoliths is not statistically significant and hence, not a reliable proxy for paleotemperature reconstruction.
Ca stable isotopesFish otolithMulti-proxy measurementsSea surface temperature reconstructionCALCIUM ISOTOPE FRACTIONATIONSEA-SURFACE TEMPERATUREARAGONITIC OTOLITHSWATER TEMPERATURESTABLE-ISOTOPESBLUEFIN TUNABLACK DRUMSTRONTIUMSALINITYBARIUM
NSTL
Elsevier
