Isotope-Dendrochronological Investigation of Tropical Trees From Brazil: A New High-Resolution Isotopic Paleoclimate Archive

拟议的探索性研究是根据热带树木年轮氧同位素记录，建立第一个跨越过去200年的陆地高分辨率古气候档案。这将通过对巴西一种非常独特的树种的分析来实现。这项研究的氧同位素数据可以用来推断树木正在使用的土壤水的同位素组成的变化，这与降水直接相关(因此可能与大气循环有关)。这项工作将使用一种新开发的优化有机质中氧同位素测量的方法来完成。这种方法既是新颖的，也是实验性的，但结果将提供巴西过去200年来第一个气候变化的年度分辨率同位素记录。

The proposed exploratory study is to establish the first terrestrial high-resolution paleoclimate archive spanning the last 200 years based on a tree ring oxygen isotopic record in the tropics. This will be accomplished through the analysis of a very unique tree species in Brazil. The oxygen isotopic data from this study may be used to infer changes in the isotopic composition of soil water that the trees are using, which is directly related to precipitation (and thus potentially linked to atmospheric circulation). This work will be accomplished using a newly developed methodology for the optimized measurement of oxygen isotopes in organic matter. This approach is both novel and experimental, yet the results would provide the first annual resolution isotopic record of climate change of the last 200 years from Brazil.