Late pleistocene ice history and glacial isostasy on earth with composite rheology and lateral heterogeneity

具有复合流变性和横向异质性的晚更新世冰历史和地球冰川均衡

• 批准号: 37328-2010
• 负责人: Wu, Patrick
• 金额: $ 1.46万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=474767
• 关键词: Late; pleistocene; ice; history; glacial

Numerical modeling of the response of the solid earth and its oceans to the glaciation and deglaciation events since the last Ice Age (i.e. Glacial Isostatic Adjustment or GIA process) gives us knowledge about the viscosity or flow property inside the mantle and the ice sheet thickness history during the Pleistocene. Knowledge of the viscosity is crucial in understanding thermal evolution and mantle dynamics that shaped the structure of our planet in the past, present and future. Knowledge of the ice thickness history provides realistic boundary conditions for paleoclimate simulation and is useful for glaciology and global change studies. Improved knowledge of GIA is also required to accurately monitor present-day global warming with modern geodetic techniques. The results of this study will also be useful for mitigating earthquake risk induced by glacial cycles and water resource management in Canada as the differential vertical motion of the land affects the flow of rivers, lakes and coastlines.

通过对末次冰期以来的冰川作用和冰消作用（即冰川均衡调整过程或GIA过程）的数值模拟，我们可以了解到更新世以来地幔内部的粘性或流动特性以及冰盖厚度的变化历史。粘性的知识对于理解热演化和地幔动力学至关重要，这些动力学在过去，现在和未来塑造了我们星球的结构。冰厚历史的知识提供了现实的边界条件，古气候模拟，是有用的冰川学和全球变化研究。还需要增进对全球影响评估的了解，以便利用现代大地测量技术准确监测当今全球变暖。这项研究的结果也将有助于减轻加拿大冰川循环和水资源管理引起的地震风险，因为土地的差异垂直运动影响河流，湖泊和海岸线的流动。