Atmospheric Dust in North Central Greenland Ice: North Grip

该提案将参与格陵兰中北部的North GRIP或NGRIP（北格陵兰冰湖项目）深核项目。 这项工作开始由丹麦人领导，来自其他六个国家的科学家参加。 如果得到资助，美国的贡献将是测量尘埃的矿物学和放射性同位素特征，以确定其来源（本提案），以及测量和解释稳定同位素（詹姆斯白色，美国）。科罗拉多）。 正如丹麦人所说，钻取这个岩芯的主要目的是从格陵兰岛的冰中恢复一个关于Eemian的可靠记录。 然而，除了这项任务之外，还有很多东西要学，无论能否成功地恢复一个未受干扰的Eemian部分，都可以从这个核心中获得很多东西。 该项目的目标是： - 使用矿物学和Sr-，Nd-和Pb-同位素组成，以确定已沉积在NGRIP在冰芯记录的时期内的大气尘埃的源区-希望包括Eemian -从而提供约束的模型的古大气环流和运输从尘埃源区的NGRIP格陵兰岛的一部分。 - 将NGRIP记录的这些尘埃源区与Summit（GISP 2，GRIP）和其他可能的格陵兰核心站点（例如，染料3），从而开始辨别输送路径的局部（格陵兰）变化程度，进一步限制环流模式; - 如果在NGRIP恢复了未受干扰Eemian冰，则在GRIP具体比较来自冰的灰尘与假定的Eemian冰，具有任何显著的变化。

This proposal is to participate in the North GRIP or NGRIP (North Greenland Icesheet Project) deep-core project in North Central Greenland. This effort is begin led by the Danes with participation from scientists from about six other nations. If funded, the U.S. contribution will be in measurements of mineralogical and radiogenic-isotope characteristics of dusts to determine their provenance (this proposal), and in measuring and interpreting stable isotopes (James White, U. Colorado). The principal purpose in drilling this core, as stated by the Danes, was to recover a reliable record of the Eemian from Greenland ice. There is much to be learned beyond this task, however, and much to be gained from this core regardless of the success in recovering an undisturbed Eemian section. This project objectives are: - using mineralogical and Sr-, Nd- and Pb-isotope compositions, to determine the source areas of the atmospheric dusts that have been deposited at NGRIP over the period recorded by the ice core -- hopefully including the Eemian -- thus providing constraints for models of paleoatmospheric circulation and transport from the dust source areas to the NGRIP part of Greenland. - to compare these dust source areas recorded at NGRIP to those recorded at the same times in the dusts at Summit (GISP2, GRIP), and other possible Greenland core sites (e.g., Dye 3), and thus begin to discern degrees of local (Greenland) variability in transport pathways, further constraining circulation models; - if undisturbed Eemian ice is recovered at NGRIP, to specifically compare dusts from that ice to the putative Eemian ice, with any significant variations, at GRIP.