Reconstruction of the East China Sea palaeoenvironment at 16 ka by comparison of fossil and modern Faviidae corals from the Ryukyus, southwestern Japan
Reconstruction of the East China Sea palaeoenvironment at 16 ka by comparison of fossil and modern Faviidae corals from the Ryukyus, southwestern Japan
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DOI：
10.1002/jqs.1268
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发表时间：
2008-12
影响因子：
2.3
通讯作者：
M. Mishima;H. Kawahata;A. Suzuki;M. Inoue;Takashi Okai;A. Omura
中科院分区：
文献类型：
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作者：
M. Mishima;H. Kawahata;A. Suzuki;M. Inoue;Takashi Okai;A. Omura
我们对采自日本琉球群岛宫古岛附近的16ka珊瑚化石标本(MYK90)的锶/钙比值和氧、碳稳定同位素进行了配对测量。本研究旨在通过与现代珊瑚科珊瑚化石样品的对比，重建16ka以来东中国海的古环境。我们的年或更长时间分辨率的数据可能非常适合于古海洋学重建，尽管还没有关于扇形科珊瑚的通用定标方法的报道。我们的定标结果表明，在16ka，年平均海表面温度比现在低约5℃，而研究地点的海表面盐度(SSS)局部高于现在。尽管黄河和长江的入海口由于海平面低得多而位于现在位置的以东，但我们的结果表明，陆地水排放的影响可能没有延伸到宫古岛。最后一次冰期的夏季风活动较弱，导致亚洲大陆夏季降水减少，冬季季风增强，可能导致更多的蒸发，这可能是导致研究地点SSS推定较高的原因。版权所有©2009 John Wiley&Sons，Ltd.
We conducted paired measurements of the Sr/Ca ratio and oxygen and carbon stable isotopes of a fossil Faviidae coral specimen (MYK90), age 16 ka, collected from near Miyako Island, the Ryukyus, southwestern Japan. Our study aimed to reconstruct the palaeoenvironment in the East China Sea at 16 ka by comparing the fossil sample with modern Faviidae corals. Our data with annual or longer time resolution may be very suitable for palaeoceanographic reconstruction, although no general calibration method for Faviidae corals has been reported. Our calibration showed that the annual mean sea surface temperature was approximately 5°C lower and sea surface salinity (SSS) at the study site was locally higher at 16 ka than at present. Even though the mouths of the Yellow and Changjiang rivers were east of their present locations because sea level was much lower, our results suggest that the influence of the terrestrial water discharge may not have extended to Miyako Island. Weak summer monsoon activity during the last glacial, which decreased summer precipitation over the Asian continent, and an enhanced winter monsoon, which may have led to more evaporation, likely contributed to the inferred high SSS at the study site. Copyright © 2009 John Wiley & Sons, Ltd.