Deep-sea coral records of past ventilation rate and temperature in the Southern Ocean and North Atlantic

该奖项是根据2009年美国复苏和再投资法案（公法111-2）资助的。为什么二氧化碳在冰川时间尺度上变化，以及为什么冰芯记录在千年至百年时间尺度上不同步，这些问题的解释最有可能存在于海洋深处。要了解原因，我们必须首先了解这个水库在不同气候状态和快速气候变化下是如何变化的。为了实现这一目标，pi概述了使用深海珊瑚测量过去深海温度和Ä14C的计划。他们将使用一种现已建立的深海珊瑚技术，结合u系列和14C年龄来测量过去的Ä14C。他们希望使用新建立的？成块的同位素吗?温度计。由于该技术依赖于CaCO3键中13C和18O原子的相对顺序，因此它与水ä18O值无关。样品已经到手了。更广泛的影响包括支持加州理工学院一位印度裔美国科学家的博士研究。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-2).Explanations for why CO2 varies on glacial timescales and why the ice core records are out of sync on millennial-centennial timescales most likely reside in the deep ocean. To learn why we must first know how this reservoir changes under different climate states and across rapid climate transitions. Toward this objective the PIs outline a plan for using deep-sea corals to measure the past deep ocean temperatures and Ä14C. They will measure past Ä14C using combined U-series and 14C ages in a now well-established deep-sea coral technique. They hope to measure past temperatures to ±1°C or better using the newly established ?clumpy isotope? thermometer. As this technique depends on the relative ordering of 13C and 18O atoms in CaCO3 bonds, it is independent of the water ä18O value. Samples are already in hand.Broader impacts include the support of the PhD work of an Indian-American scientist at Caltech.