International Research Fellow Awards: Chemical Characterization of the Inorganic Material in Individual Snowcrystals Using SEM/EDS and SIMS

9704208 Ehrman国际研究员奖励计划使美国科学家和工程师能够在国外进行三到二十四个月的研究。该计划的奖励为联合研究提供了机会，并利用独特或互补的设施、专业知识和国外的实验条件。该奖项将支持Sheryl H. Ehrman博士在瑞士Villigen的Paul Scherrer研究所与Urs Baltensperger博士进行为期12个月的博士后研究访问。该研究所在冰川和冰芯研究方面有很强的项目。该项目将使用扫描电子显微镜结合能量色散光谱（SEM/EDS）和次级离子质谱（SIMS）来研究雪晶，以收集冰中化学物质浓度与大气中化学物质浓度之间的关系。通过研究冰芯，他们可以找到过去火山爆发、核武器试验和过去全球加热/冷却循环的证据。所选择的地点对于这项研究来说是理想的，不仅因为它的地理位置，而且因为将要研究的蒙特罗莎冰川是一个寒冷的冰川，它的温度从来没有上升到零度以上，因此避免了融化，这可能会模糊冰芯样本的时间分辨率。＊＊＊

9704208 Ehrman The International Research Fellow Awards Program enables U.S. scientists and engineers to conduct three to twenty four months of research abroad. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad. This award will support a twelve-month postdoctoral research visit by Dr. Sheryl H. Ehrman to work with Dr. Urs Baltensperger at the Paul Scherrer Institute in Villigen, Switzerland. The Institute has strong programs in glacier and ice core research. This project will study snow crystals using a scanning electron microscope coupled with energy dispersive spectroscopy (SEM/EDS) and secondary ion mass spectrometry (SIMS) to gather information on how concentrations of chemical species in ice relate to concentrations of chemical species in the atmosphere. By studying ice cores, they can find evidence of past volcanic eruptions, nuclear weapons tests, and past global heating/cooling cycles. The selected site is ideal for this research, not only because of its geography, but because the Monte Rosa glacier which will be studied, is a cold glacier, the temperature of which never rises above zero, thus avoiding melting which can blur the time resolution in the ice core samples. ***