Reconstructing past ice sheet dynamics and decay from glacial geomorphology and sedimentology

从冰川地貌学和沉积学重建过去的冰盖动力学和衰变

• 批准号: 194107-2009
• 负责人: Brennand, Tracy
• 金额: $ 1.46万
• 依托单位: Simon Fraser University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=523110
• 关键词: Reconstructing; past; ice; sheet; dynamics

This research program is mainly concerned with understanding the pattern, evolution and controls on ice motion, stability and decay within the ice masses that covered much of Canada and the northern United States during the last ice age. It is important to understand the behaviour of ancient ice sheets because the models developed for their growth, decay, geometry and stability can be used to predict the behaviour of present-day Arctic and Antarctic ice masses that in turn influence global sea level and climate. Ice motion is, in large part, governed by processes taking place at the glacier bed. The beds of present-day ice sheets are difficult to access, so we turn to the beds of ancient ice sheets (the landforms and sediments that they left behind) to explore the processes that regulate ice dynamics over broad areas, at a variety of scales and perhaps over whole ice ages. Processes taking place at the glacier bed impact ice sheet properties (e.g., thickness, geometry, debris content) and likely have an enduring effect on the rate, style and geometry of ice sheet decay. Research in this application probes the beds of ancient ice sheets, and their landscapes of decay, in order to enhance our understanding of ice motion, stability and decay.

该研究计划主要涉及了解在上一个冰河时代覆盖加拿大和北方美国大部分地区的冰团内冰运动、稳定性和衰变的模式、演变和控制。了解古代冰盖的行为很重要，因为为它们的增长、衰减、几何形状和稳定性开发的模型可用于预测当今北极和南极冰盖的行为，而这些冰盖反过来又影响全球海平面和气候。冰的运动在很大程度上是由冰川床发生的过程控制的。现代冰盖的河床很难接近，所以我们转向古代冰盖的河床（它们留下的地貌和沉积物），以探索在各种尺度上，甚至在整个冰河时代，在广阔的区域内调节冰动力学的过程。冰川床发生的过程影响冰盖的性质（例如，厚度、几何形状、碎片含量），并可能对冰盖衰减的速度、风格和几何形状产生持久影响。这项应用的研究探索了古代冰盖的床，以及它们的腐烂景观，以提高我们对冰的运动，稳定性和腐烂的理解。