Snow and Firn Microstructure and Transport Properties: U. S. ITASE

雪和冷杉的微观结构和传输特性：U. S. ITASE

• 批准号: 9814676
• 负责人: Mary Albert
• 金额: $ 18.69万
• 依托单位: Department of Army Cold Regions Research & Engineering Lab
• 依托单位国家: 美国
• 项目类别: Interagency Agreement
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814676&HistoricalAwards=false
• 关键词: Snow; Firn; Microstructure; Transport; Properties

This award supports a project to measure snow and firn bulk properties and microstructure along the route of the U.S. International Trans-Antarctic Scientific Expedition (US ITASE) traverses in West Antarctica. These parameters are important because they control the air-snow-firn transport processes and thus the manner in which heat, vapor, and chemical species in air are incorporated into snow and polar firn. The objectives of the project are to obtain field measurements of near-surface (down to 2 meters) snow and firn properties, which include surface roughness, permeability, density, grain size, surface-to-volume ratio, and tortuosity. In addition microstructural measurements and measurements of the above properties will be measured in firn cores down to 20 meters back in the laboratory. These measurements will be used in a transport model to elucidate the nature of the air-snow-firn exchange and firnification process at the various sites along the U.S. ITASE traverse. Since many of the snow and firn properties also affect the interaction of radiation in different parts of the electromagnetic spectrum, these measurements will provide valuable ground truth to those efforts using remote sensing to map the spatial variations of snow, firn and ice properties.

该奖项支持一个项目，该项目沿着美国国际跨南极科学考察队（US ITASE）穿越南极洲西部的路线测量雪和雪的体积特性和微观结构。这些参数很重要，因为它们控制着空气-雪-雪的输送过程，从而控制着空气中的热、蒸汽和化学物质被雪和极地冰吸收的方式。该项目的目标是获得近地表（低至2米）雪和雪性质的现场测量数据，包括表面粗糙度、渗透率、密度、颗粒尺寸、表面体积比和弯曲度。此外，显微结构测量和上述性质的测量将在实验室中测量20米深的铁芯。这些测量结果将用于运输模型，以阐明美国ITASE导线沿线不同地点的空气-雪交换和固化过程的性质。由于雪和冰的许多特性也会影响电磁波谱不同部分的辐射相互作用，因此这些测量将为利用遥感绘制雪、冰和冰特性的空间变化图的工作提供宝贵的地面真相。