Annual fluctuation in the stable carbon isotope ratio of coral skeletons: The relative intensities of kinetic and metabolic isotope effects
Annual fluctuation in the stable carbon isotope ratio of coral skeletons: The relative intensities of kinetic and metabolic isotope effects
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DOI：
10.1016/j.gca.2004.12.018
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发表时间：
2005-06
影响因子：
5
通讯作者：
T. Omata;A. Suzuki;H. Kawahat;M. Okamoto
中科院分区：
文献类型：
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作者：
T. Omata;A. Suzuki;H. Kawahat;M. Okamoto
生物碳酸盐碳氧稳定同位素的测定为恢复古海洋环境提供了重要信息。特别是18 O/16 O比值与海水的温度和盐度相关，13 C/12 C是海水中溶解无机碳和共生体光合作用的替代指标。本文报道了不同生长速率的滨珊瑚（Porites属）骨骼的~（13）C/~（12）C和~（18）O/~（16）O值。在生长较快的珊瑚中，13 C/12 C和18 O/16 O表现出异相的年度波动。在生长较慢的珊瑚中，同位素的相位波动。我们发展了一个简单的矢量表示法来表示13 C/12 C年变化的两种类型，每种类型相对于18 O/16 O年变化具有不同的偏移。13 C/12 C和18 O/16 O年波动之间的相位偏移取决于动力学同位素对钙化作用和代谢同位素效应（如光合作用）的相对强度。这个模型可能会提高我们从珊瑚骨骼推断过去气候和海洋条件的能力。
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 and13C/12C is a proxy for dissolved inorganic carbon in seawater and symbiont photosynthesis. Here, we report13C/12C and18O/16O values for skeletons of corals (genus Porites) with various growth rates. In faster-growing corals,13C/12C and18O/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 of13C/12C annual fluctuation, each with a different offset in relation to18O/16O annual fluctuation. The phase offset between13C/12C and18O/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.