Estimating the Salinity of Subglacial Lakes From Existing Aerogeophysical Data

根据现有航空地球物理数据估算冰下湖泊的盐度

• 批准号: 0636584
• 负责人: Timothy Creyts
• 金额: $ 6.56万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-05-01 至 2012-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0636584&HistoricalAwards=false
• 关键词: Estimating; Salinity; Subglacial; Lakes; Existing

Studinger/0636584This award supports a project to estimate the salinity of subglacial Lake Vostok, Lake Concordia and the 90 deg.E lake using existing airborne ice-penetrating radar and laser altimeter data. These lakes have been selected because of the availability of modern aerogeophysical data and because they are large enough for the floating ice to be unaffected by boundary stresses near the grounding lines. The proposed approach is based on the assumption that the ice sheet above large subglacial lakes is in hydrostatic equilibrium and the density and subsequently salinity of the lake's water can be estimated from the (linear) relationship between ice surface elevation and ice thickness of the floating ice. The goal of the proposed work is to estimate the salinity of Lake Vostok and determine spatial changes and to compare the salinity estimates of 3 large subglacial lakes in East Antarctica. The intellectual merits of the project are that this work will contribute to the knowledge of the physical and chemical processes operating within subglacial lake environments. Due to the inaccessibility of subglacial lakes numerical modeling of the water circulation is currently the only way forward to develop a conceptual understanding of the circulation and melting and freezing regimes in subglacial lakes. Numerical experiments show that the salinity of the lake's water is a crucial input parameter for the 3-D fluid dynamic models. Improved numerical models will contribute to our knowledge of water circulation in subglacial lakes, its effects on water and heat budgets, stratification, melting and freezing, and the conditions that support life in such extreme environments. The broader impacts of the project are that subglacial lakes have captured the interest of many people, scientists and laymen. The national and international press frequently reports about the research of the Principal Investigator. His Lake Vostok illustrations have been used in math and earth science text books. Lake Vostok will be used for education and outreach in the Earth2Class project. Earth2Class is a highly successful science/math/technology learning resource for K-12 students, teachers, and administrators in the New York metropolitan area. Earth2Class is created through collaboration by research scientists at the Lamont- Doherty Earth Observatory; curriculum and educational technology specialists from Teachers College, Columbia University; and classroom teachers in the New York metropolitan area.

Studinger/0636584该奖项支持一个利用现有机载探冰雷达和激光高度计数据估算冰下沃斯托克湖、康科迪亚湖和东经90度湖盐度的项目。选择这些湖泊是因为现代航空地球物理数据的可用性，因为它们足够大，浮冰不受接地线附近边界应力的影响。所提出的方法是基于这样的假设，即冰盖以上的大型冰下湖泊是在流体静力平衡和密度和随后的湖水的盐度可以估计从（线性）之间的关系冰面海拔和冰厚度的浮冰。 拟议工作的目标是估计沃斯托克湖的盐度并确定空间变化，并比较南极洲东部3个大型冰下湖泊的盐度估计值。 该项目的智力价值在于，这项工作将有助于了解冰下湖泊环境中的物理和化学过程。由于冰下湖泊的交通不便，水循环的数值模拟是目前唯一的出路，以发展一个概念性的了解冰下湖泊的循环和融化和冻结制度。数值实验表明，湖水的盐度是三维流体动力学模型的一个重要输入参数。改进的数值模型将有助于我们了解冰下湖泊的水循环，其对水和热收支的影响，分层，融化和冻结，以及在这种极端环境中支持生命的条件。 该项目更广泛的影响是，冰下湖泊引起了许多人、科学家和外行的兴趣。国家和国际新闻界经常报道首席研究员的研究。他的东方湖插图已被用于数学和地球科学教科书。沃斯托克湖将用于Earth 2Class项目的教育和推广。Earth 2Class是纽约大都市地区K-12学生、教师和管理人员非常成功的科学/数学/技术学习资源。Earth 2Class是由拉蒙-多尔蒂地球观测站的研究科学家、哥伦比亚大学师范学院的课程和教育技术专家以及纽约大都市区的课堂教师合作创建的。