Atmospheric Transport and Deposition of Chemical Constituent at Summit, Greenland

这一项目是对化学微量元素和物质从源区经大气输送到格陵兰冰原的调查的继续。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)确定化学成分到达钻探地点的来源区域和大气路径，包括在运输过程中气团特征可能发生的变化；(2)研究湿、干沉积机制和化学物质进入降水雪的速率；(3)研究沉积后积雪化学变化和积雪内物种的再分布。野外工作包括收集空气、气溶胶、降水和积雪样品，分析各种阴离子和阳离子、微量元素、碳化合物和微量气体。作为GISP-2计划的一部分，一个特殊的大气营地正在维护，以确保样品不会受到钻探的污染。

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 investigation of post-depositional changes in snow chemistry and of the redistribution of species within the snowpack. Field work consists of 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. A special atmospheric camp, to ensure that samples will be uncontaminated by the drilling, is being maintained as part of the GISP-2 program.