TERRAPUB Geochemical Journal
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Geochemical Journal, Vol. 47 (No. 3), pp. e1-e5, 2013

EXPRESS LETTER

Coral growth-rate insensitive Sr/Ca as a robust temperature recorder at the extreme latitudinal limits of Porites

Shoko Hirabayashi,1,2 Yusuke Yokoyama,1,2 Atsushi Suzuki,3 Yuta Kawakubo,1,2 Yosuke Miyairi,1 Takashi Okai3 and Satoshi Nojima4

1Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
2Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
3Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
4Amakusa Marine Biological Laboratory, Kyushu University, 2231 Tomioka, Reihoku-cho, Amakusa-gun, Kumamoto 863-2507, Japan

(Received March 14, 2013; Accepted May 5, 2013; Online published May 17, 2013)

Abstract: Oxygen isotope values of low-growth coral (<5 mm/yr) skeletons may reflect kinetic effects, which is problematic for sea surface temperature (SST) reconstruction. Here, we report a Sr/Ca-based SST reconstruction for a temperate Porites coral collected from Kyushu, Japan, near the northern latitudinal extent of hermatypic corals. Results indicate that Sr/Ca variations in a low-growth coral remain independent from growth rate, in contrast to the oxygen isotope ratios of the same coral.
Key words: skeletal oxygen isotope in the coral, Sr/Ca, high latitudes, coral growth rates


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