Chemical Constituents in Air and Snow at Summit, Greenland: Interpretation of the GISP-2 Ice Core

9321642 Davidson这个项目是对化学微量元素和物种从来源地区通过大气到格陵兰冰盖运输的调查的继续。它的目标是为解释格陵兰冰盖计划（GISP-2）钻探工作获得的长冰芯中的微量元素分布提供信息。冰芯有望提供跨越20万年的详细记录。该项目有三个具体目标：(1)确定到达钻探地点的化学成分的来源区域和大气路径，包括运输过程中气团特征的可能变化；(2)研究干湿沉积机制和化学物质进入降水雪的速率；(3)开发解释深层冰芯数据的方法。先前的野外工作已经收集了空气、气溶胶、降水和沉积的雪样品，将对各种阴离子和阳离子、微量元素、碳化合物和微量气体进行分析。本项目将着重研究沉积机制。＊＊＊

9321642 Davidson This project is the continuation of an investigation of the transport of chemical trace elements and species from source regions through the atmosphere to the Greenland ice sheet. Its goal is to provide information for the interpretation of the trace element distribution in a long ice core being obtained through the Greenland Ice Sheet Program (GISP-2) drilling effort. The ice core is expected to provide a detailed record spanning 200,000 years. The project has three specific objectives: (1) the identification of source regions and atmospheric pathways for the chemical constituents reaching the drill site, including the possible changes in air mass characteristics during transit, (2) the study of the wet and dry deposition mechanisms and rates of incorporation of chemical species into precipitating snow, and (3) the development of methods of interpreting the deep ice core data. Prior field work has resulted in the collecting of air, aerosol, precipitation, and deposited snow samples, which will be analyzed for various anions and cations, trace elements, carbon compounds, and trace gases. This project will emphasize the deposition mechanisms. ***