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Seasonal stable oxygen isotope cycles in an Antarctic bivalve shell (Laternula elliptica): a quantitative archive of ice-melt runoff

Published online by Cambridge University Press:  23 March 2006

Yohei Tada ,
Hideki Wada  and
Hideki Miura
Yohei Tada
Affiliation:
Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, [email protected]
Hideki Wada
Affiliation:
Department of Biology and Geosciences, Faculty of Science, Shizuoka University, 836 Oya, Suruga-ku, Shizuoka, 422-8529, Japan
Hideki Miura
Affiliation:
Division of Geoscience, National Institute of Polar Research (NIPR), 1-9-10 Kaga, Itabashi-ku, Tokyo, 173-8515, Japan
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Abstract

Oxygen isotope ratios in the shell of a Recent Antarctic marine bivalve Laternula elliptica are shown and their potential for environmental reconstruction is discussed. The shell δ18O profiles of this species represent the seasonal change in melted ice water inflow. Oscillations in the shell δ18O values reflect seasonal change in seawater δ18O values, caused by an addition of meltwater in summer. Since annual temperature variation is minimal and the inflow of the regional ice-melt is the dominant control on the shell δ18O values, the oxygen isotope record of L. elliptica is a quantitative indicator of the palaeo-ice-melting events in the Antarctic continental margin.

Keywords

Antarcticabivalve shellmeltwaterseasonalitystable oxygen isotope
Type
EARTH SCIENCES
Information
Antarctic Science , Volume 18 , Issue 1 , March 2006 , pp. 111 - 115
Copyright
© Antarctic Science Ltd 2006

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