Temperature-skeletal 3180 relationship of Porites australiensis from Ishigaki Island, the Ryukyus, Japan
Temperature-skeletal 3180 relationship of Porites australiensis from Ishigaki Island, the Ryukyus, Japan
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日本琉球石垣岛澳大利亚滨珊瑚的温度与骨骼关系 3180
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发表时间：
2008
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通讯作者：
H. Kawahata
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作者：
'. A. SUZUKI;I. Yukino;H. Kawahata
采用沿着生长轴的高频微取样技术，对西北太平洋石垣岛的澳大利亚滨珊瑚（Porites australiensis）进行了温度-骨骼温度（相对于PDB）的关系研究，结果表明：8180 = -0.611 0. 165 T（°C）.石垣岛周围的海表温度年变化约为10°C，而盐度的季节变化小于0.5。因此，在一级近似下，季节变化对礁水8180值的影响可以忽略。由于该珊瑚群生长的地点距离温度监测站只有300米，因此，温度监测站的海面温度数据可代表该珊瑚群的海面温度。该公式与之前报道的太平洋其他地区的滨珊瑚的公式比较接近，但与Mitsuguchi等人（1996年，Science，274，961-963）对同一岛屿东海岸的Porites lutea的公式不同。这种差异的原因尚不清楚，但可能部分归因于沿着生长轴的微量取样频率较低：本研究中每年生长增量收集24个样品，而他们的研究中分析了15-17个样品。较低的采样频率会导致季节性氧同位素信号的衰减。这种关系还需要进一步的研究，包括对礁沃茨氧同位素组成和滨珊瑚属种间差异的研究。
We propose a temperature-skeletal 5180 (relative to PDB) relationship of Porites australiensis coral from Ishigaki Island, the northwestern Pacific, with high frequency microsampling along the growth axis: 8180 = -0.611 0.165T (°C). Annual variation of sea surface temperature around Ishigaki Island is about 10°C while seasonal salinity change is less than 0.5. Therefore, the effects of seasonal variation on 8180 value of reef water can be neglected at the first approximation. As this coral colony was growing only 300 m apart from temperature monitoring station, sea surface temperature data from the station can represent those at the coral site. The equation is relatively close to those reported earlier for Porites corals from other regions of the Pacific, but differs from that of Mitsuguchi et al. (1996, Science, 274, 961-963) for Porites lutea from the eastern coast of the same island. The cause of this difference is unclear, but it might partly be attributed to lower frequency of their microsampling along the growth axis: 24 samples per annual growth increment were collected in this study while 15-17 samples were analyzed in their study. Lower sample frequency would result in the attenuation of seasonal oxygen isotope signals. Further re search including examinations on oxygen isotope compositions in reef waters and the inter-species differ ence among the genera Porites are also needed to confirm this relationship.