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骼中测量锶/钙比率作为海表面温度(SST)的可靠替代指标的可能性。这项工作将检验一种假设,即白天沉积的文石中的锶/钙由于藻类共生体的存在而具有重要作用,而晚上沉积的文石与周围的SST处于热力学平衡状态。PIS将首先识别在夜间沉积的现代珊瑚中的珊瑚骨架部分,然后使用SIMS离子微探测器来校准锶/钙,作为SST的替代。校准研究完成后,将从巴巴多斯和瓦努阿图采集的珊瑚化石中测量夜间文石中的锶/钙,以确定最后一次冰川期间的热带SST。
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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