Foraminiferal Trace-Element Paleothermometry During Transient Paleogene Climates: A Test of Stable Isotope-Based Paleoceanographic Reconstructions of the Late Paleocene Thermal Max

9901447 Schellenberg对甲壳素氧同位素值的多重控制限制了我们对古新世晚期最热时期和始新世-渐新世“温室-冰屋”转变期间瞬变(~105年)气候极端的理解。这项研究将把被证明高度依赖于温度的有孔虫的镁：钙比与这些事件的现有有孔虫氧同位素记录相结合。由于海水Mg：Ca在这种时间尺度上实际上是恒定的，这种对比方法将提供一种手段：(1)LPTM期间的分配温度和海水氧同位素(即盐度)动态；(2)始新世-渐新世过渡期间的分配温度和海水氧同位素(即冰量)动态。这些数据对于检验现有的古气候假说、理解快速气候变化的机制以及整合地球历史的环境和生物成分至关重要。

9901447SchellenbergMultiple controls upon forminiferal oxygen isotope values limit our understanding of transient (~105 yr) climate extremes during the Late Paleocene Thermal Maximum and Eocene-Oligocene "Greenhouse-Icehouse" transition. The study will couple Mg:Ca ratios of foramifera, demonstrated to be highly temperature-dependent, with existing foraminiferal oxygen isotope records of these events. As seawater Mg:Ca over such time-scales is effectively constant, this comparative approach will provide a means to (1) partition temperature and seawater oxygen isotope (i.e., salinity) dynamics during the LPTM and (2) partition temperature and seawater oxygen isotope (i.e., ice-volume) dynamics during the Eocene-Oligocene transition. Such data is critical for testing existing paleoclimate hypotheses, understanding the mechanism of rapid climate change, and integrating environmental and biological components of Earth history.