US-Israel Dissertation Enhancement: Holocene Paleoclimate Investigations in the Venezuelan Andes Using Oxygen Isotopes in Ditom Opal

0004425布拉德利这个论文提高奖支持美国研究生，Pratigya J. Polissar，在Raymond S.布拉德利，地球科学系，马萨诸塞州大学，谁将花六个月在实验室的阿尔多舍梅什在魏茨曼科学研究所在以色列雷霍塞特。 研究将侧重于测量硅藻二氧化硅氧同位素组成的技术，并将其应用于委内瑞拉全新世湖泊沉积物。 硅藻二氧化硅中的同位素分析是困难的，Shemesh博士的实验室是世界上进行这些测量的最佳地点之一。 了解气候系统的自然变率对于预测和解释当前和未来的气候变化至关重要。 在热带地区，降水和蒸发之间的平衡是一个关键的气候参数，而对湖泊沉积物中保存的硅藻氧同位素组成的分析是一个相对较新的、令人兴奋的重建方法。这项研究将通过提供过去10，000年来南美洲热带地区变化的详细古气候记录，为我们了解气候做出重要贡献。

0004425BradleyThis dissertation enhancement award supports a U.S. graduate student, Pratigya J. Polissar, working under the guidance of Raymond S. Bradley, Department of Geosciences, University of Massachusetts, who will spend six months in the laboratory of Aldo Shemesh at The Weizmann Institute of Science in Rehovot, Israel. The research will focus on the technique for measuring the oxygen isotope composition of diatom silica and applying it to Holocene lake sediments from Venezuela. The analysis of isotopes in diatom silica is difficult and Dr. Shemesh's lab is one of the best sites in the world for these measurements. Understanding the natural variability of the climate system is essential for prediction and interpretation of current and future climate change. In tropical regions, the balance between precipitation and evaporation is a key climatic parameter and analysis of the oxygen isotopic composition of diatoms preserved in lake sediments is a relatively new and exciting method for reconstructing it. This research will make an important contribution to our understanding of climate by providing a detailed paleoclimate record of changes in tropical South America during the last 10,000 years.