A History of Tropical Sea Surface Temperatures since the Last Glacial Maximum using Coral Nighttime Thermometry
A History of Tropical Sea Surface Temperatures since the Last Glacial Maximum using Coral Nighttime Thermometry
批准号:
0241075
负责人:
Anne Cohen
金额:
$5.98万
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
2003
资助国家:
美国
项目状态:
已结题
起止时间:
2003-03-01 至 2004-08-31
中文摘要
这项研究将探索在夜间沉积的珊瑚骨架中测量Sr/Ca比率的潜力,作为海洋表面温度(SST)的可靠代理。这项工作将验证这样一个假设,即白天沉积的文石中的Sr/Ca由于藻类共生体而具有重要影响,但夜间沉积的文石与周围海温处于热力学平衡状态。pi将首先识别夜间沉积的现代珊瑚骨架的部分,然后使用SIMS离子探针校准Sr/Ca作为海温的代表。校正研究完成后,将在巴巴多斯和瓦努阿图珊瑚化石的夜间文石中测量Sr/Ca,以确定末次冰期热带海温。
英文摘要
This research will explore the potential for measuring Sr/Ca ratios in coral skeletons deposited during the night as a reliable proxy for sea-surface temperature (SST). The work will test the hypothesis that Sr/Ca in aragonite deposited during the daytime contains a vital effect due to algal symbionts but that aragonite deposited during the night is in thermodynamic equilibrium with ambient SST. PIs will first identify portions of coral skeleton in modern corals deposited during nighttime and then use SIMS ion microprobe to calibrate Sr/Ca as a proxy for SST. After the calibration studies are done Sr/Ca will be measured in nighttime aragonite from fossil corals recovered from Barbados and Vanuatu to determine tropical SST during the last glacial.
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