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Science 8 November 1996:
Vol. 274. no. 5289, pp. 961 - 963
DOI: 10.1126/science.274.5289.961
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Reports
Mg/Ca Thermometry in Coral Skeletons
Takehiro Mitsuguchi,
*
Eiji Matsumoto,
Osamu Abe,
Tetsuo Uchida,
Peter J. Isdale
The magnesium-to-calcium (Mg/Ca) ratio of coral skeletons from
Ishigaki Island, Ryukyu Islands, Japan, closely tracked sea surface
temperature (SST) over an 8-year period. Measurements were made
with the fast technique of inductively coupled plasma-atomic emission
spectrometry. The variation of the coral Mg/Ca ratio with SST change is
about four times that of the current, widely used coral
strontium-to-calcium ratio. The temporal and geographic variation of
the seawater Mg2+/Ca2+ ratio probably has
little influence on coral Mg/Ca variation. Results indicate that the
coral Mg/Ca ratio has the potential to provide fast, precise,
high-resolution proxies for past tropical SSTs.
T. 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.
*
To whom correspondence should be addressed.
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