Earth Sciences Postdoctoral Research Fellowship Award

将非碳酸盐矿物的氧、氢同位素体系与同生方解石和大气降水的氧同位素体系进行比较。这些数据将：(1)量化土壤水分蒸发的同位素效应；(2)检验哪些土壤矿物质更适合作为气候指标。该方法背后的假设是，土壤矿物记录了大气水形成时的同位素组成。土生方解石的氧同位素值已经被用来代替气候，但保存在其他土壤矿物中的气候记录在很大程度上还没有被探索。由于方解石不会在相对潮湿的土壤中形成，这项工作如果成功，将极大地扩大气候指标的使用环境。

EAR-9525336 Stern, Libby A. The oxygen and hydrogen isotope systematics of non-carbonate minerals in altitudinal transects will be compared with oxygen isotope values of cogenetic calcite and meteoric water. These data will: (1) quantify the isotopic effects of soil water evaporation, and (2) test which soil minerals are more useful as climate indicators. The assumption behind the method is that soil minerals record the isotopic composition of meteoric water at the time of their formation. The oxygen isotope value of pedogenic calcite has been used as a proxy for climate, but the climate record preserved in other soil minerals is largely unexplored. Because calcite does not form in soils in relatively humid climates, this work, if successful, will greatly expand the environments in which climatic indicators can be utilized.