Last Interglacial coral record of enhanced insolation seasonality and seawater 18O enrichment in the Ryukyu Islands, northwest Pacific
Last Interglacial coral record of enhanced insolation seasonality and seawater 18O enrichment in the Ryukyu Islands, northwest Pacific
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DOI：
10.1029/2001gl013482
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发表时间：
2001-10-01
影响因子：
5.2
通讯作者：
Kawahata, H
中科院分区：
文献类型：
--
作者：
Suzuki, A;Gagan, MK;Kawahata, H
我们提供了一个保存完好的末次间冰期Porites sp.的校准、高分辨率O-18/O-16和C-13/C-12记录。日本与那国岛海平面高台地的珊瑚(U-Th年龄为127+/-6ka)。化石珊瑚的增量O-18和增量C-13值的季节变化大于在同一珊瑚礁环境中观察到的现代珊瑚记录中的值，似乎是由于末次间冰盛期北半球日照季节性增强所致。与现代类似物相比，化石珊瑚中的O-18丰度为千分之1.1，这不能完全归因于海面温度的降低，因为该地区的珊瑚已经在以较低的温度极限生长。相反，大多数O-18的浓缩肯定是由于表层海水的O-18三角洲的变化，可能是对海洋蒸发的增强或黑潮海流更大的体积通量的响应。
We present a calibrated, high-resolution O-18/O-16 and C-13/C-12 record for a well-preserved Last Interglacial Porites sp. coral (U-Th age of 127 +/- 6 ka) from the sea-level high-stand terrace of Yonaguni Island, Japan. Seasonal variations in the delta O-18 and delta C-13 values for the fossil coral are greater than those observed in modem coral records from the same reef setting and appear to be driven by the enhanced insolation seasonality in the northern hemisphere during the Last Interglacial maximum. The O-18 enrichment of 1.1 parts per thousand in the fossil coral compared to the modem analogue cannot be due entirely to a reduction in sea-surface temperature because corals in this region are already growing at their lower thermal limit. Instead, most of the O-18 enrichment must be due to a change in the delta O-18 of the surface seawater, probably in response to enhanced evaporation of the ocean or a higher volume flux of the Kuroshio Current.