Fidelity of the Coral Sr/Ca Paleothermometer Following Heat Stress in the Northern Galápagos

Anson H. Cheung; Julia E. Cole; Diane M. ThompsonLael VetterGloria JimenezAlexander W. Tudhope

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Fidelity of the Coral Sr/Ca Paleothermometer Following Heat Stress in the Northern Galápagos

机译：Fidelity of the Coral Sr/Ca Paleothermometer Following Heat Stress in the Northern Galápagos

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Coral Sr/Ca records have been widely used to reconstruct and understand past sea surface temperature (SST) variability in the tropical Pacific. However, in the eastern equatorial Pacific, coral growth conditions are marginal, and strong El Ni?o events have led to high mortality, limiting opportunities for coral Sr/Ca-based SST reconstructions. In this study, we present two ~25-year Sr/Ca and Mg/Ca records measured on modern Porites lobata from Wolf and Darwin Islands in the northern Galápagos. In these records, we confirm the well-established relationship between Sr/Ca and SST and investigate the impact of heat stress on this relationship. We demonstrate a weakened relationship between Sr/Ca and SST after a major (Degree Heating Months 9°C-months) heat stress event during the 1997-1998 El Ni?o, with a larger response in the Wolf core. However, removing data that covers the 1997-1998 El Ni?o from calibration does not improve reconstruction statistics. Nevertheless, we find that excluding data after the 1997-1998 El Ni?o event from the calibration reduces the SST reconstruction error slightly. These results confirm that coral Sr/Ca is a reliable SST proxy in this region, although it can respond adversely to unusual heat stress. We suggest that noise in Sr/Ca-SST calibrations may be reduced by removing data immediately following large heat extremes.

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《Paleoceanography》 |2021年第12期|e2021PA004323-1-e2021PA004323-16|共16页
作者
Anson H. Cheung; Julia E. Cole; Diane M. ThompsonLael VetterGloria JimenezAlexander W. Tudhope;
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Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, USA;

Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, USA;

Department of Geosciences, University of Arizona, Tucson, AZ, USAChubb Limited, Philadelphia, PA, USASchool of Geosciences, University of Edinburgh, Edinburgh, UK;

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正文语种英语
中图分类海洋学;
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Fidelity; the Coral Sr/Ca; Paleothermometer;

Fidelity of the Coral Sr/Ca Paleothermometer Following Heat Stress in the Northern Galápagos

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