Physics and Mechanics of the Breakup of Warm Antarctic Sea Ice: In-Situ Experiments and Modeling

温暖的南极海冰破裂的物理和力学：原位实验和建模

• 批准号: 0338226
• 负责人: John Dempsey
• 金额: --
• 依托单位: Clarkson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0338226&HistoricalAwards=false
• 关键词: Physics; Mechanics; Breakup; Warm; Antarctic

This project is a study of how the antarctic sea ice cover responds to stresses applied by wind and ocean waves, and how the temperature distribution within the sea ice affects these responses. Experiments will be conducted on the deformation and fracture of warm sea ice in McMurdo Sound in the austral Spring by applying a series of controlled stresses and observing their effects. It is known that large ice floes are affected by microstructural anisotropies, but do not fracture in the same way as small ones do, therefore it is necessary to carry out experiments on the scale of tens of meters in order to validly extrapolate the fracture process to the larger scales that have applications to engineering problems of breaking ice. Crucial elements for this study are the obtaining of detailed information on the microstructure of the ice, such as crystal structure, brine channels, and other flaws in the ice fabric, and having a sound theoretical framework to guide the experimental work and subsequent model development. These findings will give important insight into the underlying mechanisms of ice breakup and will signi.cantly improve the reliability of models of this process. This work will improve the understanding of and ability to model the deformation and fracture of Antarctic sea ice at scales applicable to the breakup of ice sheets.

该项目研究南极海冰覆盖层如何对风和海浪施加的应力作出反应，以及海冰内的温度分布如何影响这些反应。 将通过施加一系列受控应力并观察其效果，对春季南部麦克默多海峡暖海冰的变形和断裂进行实验。 众所周知，大浮冰受微结构各向异性的影响，但不以与小浮冰相同的方式断裂，因此有必要在数十米的尺度上进行实验，以便有效地将断裂过程外推到更大的尺度上，从而应用于破冰的工程问题。 这项研究的关键要素是获得有关冰的微观结构的详细信息，例如晶体结构，盐水通道和冰结构中的其他缺陷，并具有良好的理论框架来指导实验工作和随后的模型开发。这些发现将对冰破裂的潜在机制提供重要的见解，并将显著提高这一过程模型的可靠性。这项工作将提高对南极海冰变形和破裂的理解和能力，并在适用于冰盖破裂的尺度上模拟南极海冰的变形和破裂。