Collaborative Research: Explosive Ice-Shelf Disintegration

合作研究：爆炸性冰架崩解

• 批准号: 0944233
• 负责人: Emile Okal
• 金额: $ 12.49万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0944233&HistoricalAwards=false
• 关键词: Collaborative; Research; Explosive; Ice; Shelf

This award supports a project to examine and test a 3-step process model for explosive ice-shelf disintegration that emerged in the wake of the recent 2008 and 2009 events of the Wilkins Ice Shelf. The model is conditioned on Summer melt-driven increase in free-surface water coupled with surface and basal crevasse density growth necessary to satisfy an "enabling condition". Once met, the collapse proceeds through three steps: (Step 1), calving of a "leading phalanx" of tabular icebergs from the seaward ice front of the ice shelf which creates in its wake a region, called a "mosh pit" (located between the phalanx and the edge of the intact ice shelf), where ocean surface-gravity waves are trapped by reflection (a fast mechanically enabled process), (Step 2), and a rapid, runaway conversion of gravitational potential energy into ocean-wave energy by iceberg capsize and fragmentation within the "mosh pit" which leads to further wave-induced calving, capsize and fragmentation (Step 3). The project will be conducted by a multidisciplinary team and will focus on theoretical model development, numerical method development and application and new observations. The project will participate in both the Research Experience for Undergraduates program in the Physics Department and the Summer Research Early Identification Program (SR-EIP) that fosters participation in research by underrepresented minorities. The PIs, postdoctoral scholar, graduate students and unfunded participants will develop a graduate-level seminar/tutorial to introduce advanced computational methods to glaciology. A postdoctoral scholar and graduate student will be trained in new research techniques during the project.

该奖项支持一个项目，以检查和测试一个三步过程模型的爆炸性冰架解体，出现在最近的2008年和2009年威尔金斯冰架事件之后。该模型的条件是夏季融化驱动的自由表面水的增加，加上表面和基础决口密度增长，以满足必要的“使能条件”。一旦遇到，崩溃将通过三个步骤进行：（第一步），冰架向海的冰锋上的板状冰山的“前导方阵”崩解，在其尾流中产生一个称为“mosh pit”的区域（位于方阵和完整冰架边缘之间），海洋表面重力波被反射捕获的地方（一个快速的机械使能过程），（步骤2），和一个快速的，失控的转换重力势能转化为海洋波浪能的冰山倾覆和破碎内的“mosh坑”，导致进一步的波浪诱导的产犊，倾覆和破碎（步骤3）。该项目将由一个多学科小组进行，重点是理论模型开发、数值方法开发和应用以及新的观测结果。该项目将参与物理系本科生项目的研究经验和夏季研究早期识别计划（SR-EIP），该计划旨在促进代表性不足的少数民族参与研究。PI，博士后学者，研究生和未资助的参与者将开发一个研究生级别的研讨会/教程，介绍先进的计算方法冰川学。一名博士后学者和一名研究生将在项目期间接受新研究技术的培训。