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。解释为什么二氧化碳在冰川时间尺度上变化，为什么冰芯记录在千年-百年时间尺度上不同步，最有可能存在于深海。要了解为什么，我们必须首先知道这个水库在不同的气候状态下以及在快速的气候转变中如何变化。为了实现这一目标，PI概述了一项利用深海珊瑚测量过去深海温度和Δ 14 C的计划。 他们将使用现在已经成熟的深海珊瑚技术中的U系列和14 C年龄组合来测量过去的14 C。他们希望使用新建立的？clu同位素？温度计由于该技术依赖于CaCO 3键中13 C和18 O原子的相对有序性，因此与水的Δ 18 O值无关。 更广泛的影响包括加州理工学院一位印度裔美国科学家的博士论文的支持。

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.