The Thinning of Pine Island Glacier: Model Development and Study of the Importance of Ice-Shelf Drag on Inland Ice

松岛冰川变薄：模型开发和冰架阻力对内陆冰的重要性研究

• 批准号: 0126187
• 负责人: Richard Alley
• 金额: $ 16.9万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0126187&HistoricalAwards=false
• 关键词: Thinning; Pine; Island; Glacier; Model

0126187AlleyThis award provides support for a 2 year modeling effort to study the dynamics of Pine Island Glacier (PIG). The discharge from the PIG constitutes the largest mass loss from any single West Antarctic ice stream. Satellite observations indicate that this outlet glacier is experiencing ongoing thinning and acceleration. The emphasis of this work will be on understanding the cause and the near-term projection of the observed thinning of PIG. Model experiments will address the hypothesis that the observed changes were caused by the loss of a buttressing ice shelf, and that the changes will continue in the form of an upglacier propagating wave of thinning and acceleration. To perform this work a numerical model of the coupled mass, energy, and momentum balance of Pine Island Glacier basin will be developed. The model will comprise four modular components, which will be coupled and then benchmarked against the European Ice Sheet Modeling Inititative (EISMINT) model intercomparison. The model will then be applied to the thinning of Pine Island Glacier using likely ice-shelf histories and possible basal boundary conditions to learn which may be accurate and to assess possible future behavior. The primary expected result will be an improved understanding of the importance of ice-shelf buttressing and the potential for inland thinning due to the reduction of ice-shelf drag.

0126187 Alley该奖项为为期2年的松岛冰川（PIG）动态研究建模工作提供支持。 PIG的排放构成了任何单一西南极冰流的最大质量损失。 卫星观测表明，这个出口冰川正在经历不断变薄和加速。 这项工作的重点将是了解的原因和观测到的猪变薄的短期预测。 模型实验将解决这样一个假设，即观察到的变化是由一个支撑冰架的损失造成的，变化将继续以冰川上传播的变薄和加速波的形式出现。 为了完成这项工作，将建立一个松岛冰川流域的质量、能量和动量耦合平衡的数值模型。 该模型将包括四个模块化组件，这些组件将被耦合，然后根据欧洲冰盖建模倡议（EISMINT）模型相互比较进行基准测试。 然后，该模型将被应用到薄的松岛冰川使用可能的冰架历史和可能的基础边界条件，以了解可能是准确的，并评估可能的未来行为。 主要的预期结果将是更好地了解冰架支撑的重要性以及由于冰架阻力减少而使内陆变薄的可能性。