Atmospheric Dust in North Central Greenland Ice: North Grip

格陵兰岛中北部冰层中的大气尘埃：North Grip

• 批准号: 9616146
• 负责人: Pierre Biscaye
• 金额: $ 80万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-15 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616146&HistoricalAwards=false
• 关键词: Atmospheric; Dust; North; Central; Greenland

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.

这项提案是为了参与格陵兰中北部的North GRIP或NGRIP(北格陵兰冰盖项目)深核项目。这项工作是由丹麦人领导的，其他大约六个国家的科学家也参与其中。如果得到资助，美国的贡献将是粉尘的矿物学和放射性同位素特征的测量(这项提议)，以及稳定同位素的测量和解释(詹姆斯·怀特，美国科罗拉多州)。正如丹麦人所说，钻探这个岩心的主要目的是从格陵兰岛的冰层中恢复埃米安人的可靠记录。然而，除了这项任务之外，还有很多东西需要学习，无论成功恢复未受干扰的伊米亚部分，从这个核心获得的东西都很多。该项目的目标是：-利用矿物学和锶、钕和铅同位素组成，确定在冰芯-希望包括伊米安-记录的时期内沉积在国家大气研究中心的大气粉尘的源区，从而为古大气环流模型和从尘埃源区向格陵兰国家大气研究中心部分的输送提供制约。-将NGRIP记录的这些尘源区域与同期在Summit(GISP2，GRIP)记录的尘埃和其他可能的格陵兰核心地点(例如染料3)中记录的尘埃进行比较，从而开始辨别运输路径中当地(格陵兰)变化的程度，从而进一步约束环流模型；-如果在NGRIP发现了未受扰动的埃米亚冰，则具体比较该冰的尘埃与GRIP假设的埃米亚冰的尘埃，以及GRIP有任何重大变化的埃米安冰。