Investigating Mid-Pleistocene Climate Extremes

摘要：该项目将获得浮游和底栖有孔虫的同位素和痕量金属分析，以测试北大西洋亚极地岩心的初步结果，这些结果表明，MIS 11期间的全球冰量与现代冰量相似，并且MIS 11期间的海平面并不比今天高得多。该项目将在热带大西洋和太平洋的三个地点测量浮游生物和底栖有孔虫的氧同位素比率，并将这些值与北大西洋亚极地岩心的新数据和现有数据进行比较。此外，底栖生物和浮游有孔虫在选定间隔内的Mg/Ca比值将作为温度效应的独立估计进行测量。新的分析将提供一种方法，将温度和盐度的影响与冰体积对同位素值的影响分开。底栖有孔虫的Cd/Ca和碳同位素测量将用于探测与冰期-间冰期过渡相关的深部环流变化。

Summary: This project will obtain isotopic and trace metal analyses on planktic and benthic foraminifers to test initial results from subpolar North Atlantic cores suggesting that global ice volume during MIS 11 was similar to modern ice volume and that sea level during MIS 11 was not substantially higher than today. The project will measure oxygen isotope ratios on planktic and benthic foraminifers at three sites in the tropical Atlantic and Pacific Oceans to compare these values against new and existing data from subpolar North Atlantic cores. In addition Mg/Ca ratios of benthic and planktic foraminifers in selected intervals will be measured as independent estimate of temperature effects. The new analyses will provide a means for separating temperature and salinity effects from ice volume effects on the isotope values. Cd/Ca and carbon isotope measurements of benthic foraminifers will be used to detect deep circulation changes associated with the glacial - interglacial transitions.