TY - JOUR
T1 - Annual fluctuation in the stable carbon isotope ratio of coral skeletons
T2 - The relative intensities of kinetic and metabolic isotope effects
AU - Omata, Tamano
AU - Suzuki, Atsushi
AU - Kawahat, Hodaka
AU - Okamoto, Mineo
N1 - Funding Information:
We thank T. Maruyama, H. Yamamoto, C. Kato, and Y. Furushima of JAMSTEC for valuable discussions. We are grateful to K. Minoshima and Y. Yoshinaga of AIST for technical assistance in stable isotope measurements. We also thank S. Nojima of the Amakusa Marine Biological Laboratory, K. Kobayashi of Shimane University, L. P. Gupta of AIST, and A. Iwase of University of the Ryukyus for valuable comments and useful information. S. Duhon improved the English for this manuscript. The manuscript was improved by constructive comments from T. Felis, J. Lough, and anonymous reviewers. This work was supported by a grant from JAMSTEC to T. O. and one from the Ministry of Environment to A. S.
PY - 2005/6/15
Y1 - 2005/6/15
N2 - Stable carbon and oxygen isotope measurements of biogenic carbonate provide information for reconstructing past oceanic environments. In particular, 18O/16O ratios correlate with the temperature and salinity of seawater and 13C/12C is a proxy for dissolved inorganic carbon in seawater and symbiont photosynthesis. Here, we report 13C/12C and 18O/16O values for skeletons of corals (genus Porites) with various growth rates. In faster-growing corals, 13C/12C and 18O/16O showed out-of-phase annual fluctuations. In slower-growing corals, the isotopes fluctuated in phase. We developed a simple vector notation to show two patterns of 13C/12C annual fluctuation, each with a different offset in relation to 18O/16O annual fluctuation. The phase offset between 13C/12C and 18O/16O annual fluctuations depends on the relative intensities of kinetic isotope effects on calcification and metabolic isotope effects such as photosynthesis. This model might improve our ability to infer past climate and oceanographic conditions from coral skeletons.
AB - Stable carbon and oxygen isotope measurements of biogenic carbonate provide information for reconstructing past oceanic environments. In particular, 18O/16O ratios correlate with the temperature and salinity of seawater and 13C/12C is a proxy for dissolved inorganic carbon in seawater and symbiont photosynthesis. Here, we report 13C/12C and 18O/16O values for skeletons of corals (genus Porites) with various growth rates. In faster-growing corals, 13C/12C and 18O/16O showed out-of-phase annual fluctuations. In slower-growing corals, the isotopes fluctuated in phase. We developed a simple vector notation to show two patterns of 13C/12C annual fluctuation, each with a different offset in relation to 18O/16O annual fluctuation. The phase offset between 13C/12C and 18O/16O annual fluctuations depends on the relative intensities of kinetic isotope effects on calcification and metabolic isotope effects such as photosynthesis. This model might improve our ability to infer past climate and oceanographic conditions from coral skeletons.
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U2 - 10.1016/j.gca.2004.12.018
DO - 10.1016/j.gca.2004.12.018
M3 - Article
AN - SCOPUS:20844457596
VL - 69
SP - 3007
EP - 3016
JO - Geochmica et Cosmochimica Acta
JF - Geochmica et Cosmochimica Acta
SN - 0016-7037
IS - 12
ER -
