Corals at their latitudinal limits: laser ablation trace element systematics in Porites from Shirigai Bay, Japan

Details Corals at their latitudinal limits: laser ablation trace element systematics in Porites from Shirigai Bay, Japan Corals at their latitudinal limits: laser ablation trace element systematics in Porites from Shirigai Bay, Japan

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999e%26psl.172..221f&link_type=abstract

Earth and Planetary Science Letters, Volume 172, Issue 3-4, p. 221-238.

Physics

25

Scientific paper

The rapid analytical technique of laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) was used to measure the trace elements B, Mg, Sr, Ba and U in a high-latitude coral colony (Porites lobata) taken from Shirigai Bay, Japan (32°N). A wide range of sea surface temperatures (SSTs 14.5-28°C) and upwelling events influenced this coral. Cold winter SSTs caused a decrease and/or cessation of skeletal extension. Measurements of U/Ca and Sr/Ca indicate an approximately linear response to SSTs above 18°C and a non-linear response below 18°C. Mg/Ca and B/Ca measurements both showed annual cycles broadly consistent with SST variations, but also exhibited intra-annual fluctuations not associated with temperature, suggesting that the incorporation of Mg and B into the coral skeleton was not simply regulated by temperature. It is shown that Ba/Ca ratios provide a proxy for wind-induced seasonal upwelling. This is inferred from the strong correlations between the strength of zonal winds ~1 month prior to the SST minimum and the Ba/Ca maximum. Secondary upwelling events occurred during the summers of 1982, 1987, 1991 and 1992. These summers were cooler than average and were associated with El Nin~o Southern Oscillation events.

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