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Related Experiment Videos

Mg/Ca Thermometry in Coral Skeletons

Mitsuguchi1, Matsumoto, Abe

  • 1T. Mitsuguchi, E. Matsumoto, O. Abe, Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Nagoya 464-01, Japan. T. Uchida, Nagoya Institute of Technology, Nagoya 466, Japan. P. J. Isdale, Australian Institute of Marine Science, Private Mail Bag 3, Townsville MC, Queensland 4810, Australia.

Science (New York, N.Y.)
|November 8, 1996
PubMed
Summary

Coral skeletons reveal that the magnesium-to-calcium ratio accurately tracks sea surface temperature (SST). This new proxy offers a more sensitive method for reconstructing past tropical SSTs than current coral proxies.

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Area of Science:

  • Marine geochemistry
  • Paleoceanography
  • Coral reef science

Background:

  • Coral skeletons incorporate elements from seawater, recording environmental conditions.
  • The magnesium-to-calcium (Mg/Ca) ratio in corals is a potential proxy for sea surface temperature (SST).
  • Existing coral proxies, like strontium-to-calcium (Sr/Ca), have limitations in sensitivity and resolution.

Purpose of the Study:

  • To assess the fidelity of the coral Mg/Ca ratio as a proxy for tropical SST.
  • To compare the sensitivity of the coral Mg/Ca proxy with the coral Sr/Ca proxy.

Main Methods:

  • Coral skeleton samples were collected from Ishigaki Island, Japan.
  • Inductively coupled plasma-atomic emission spectrometry was used for rapid elemental analysis.

Related Experiment Videos

  • Coral Mg/Ca and Sr/Ca ratios were measured over an 8-year period.

    • Main Results:

    • The coral Mg/Ca ratio closely tracked SST variations over the 8-year study period.
    • The sensitivity of the coral Mg/Ca ratio to SST change was approximately four times greater than that of the coral Sr/Ca ratio.
    • Seawater Mg2+/Ca2+ variations showed minimal influence on coral Mg/Ca.

    Conclusions:

    • The coral Mg/Ca ratio is a robust and sensitive proxy for reconstructing past tropical SSTs.
    • This method offers a high-resolution, precise tool for paleoclimate research.
    • The coral Mg/Ca proxy surpasses the utility of the coral Sr/Ca proxy for SST reconstructions.