Mapping and modeling deglacial ice dynamics and relative sea-level history in Newfoundland

纽芬兰冰消冰动力学和相对海平面历史的测绘和建模

• 批准号: 203526-2013
• 负责人: Bell, Trevor
• 金额: $ 2.4万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=569958
• 关键词: Mapping; modeling; deglacial; ice; dynamics

This research program focuses on two themes: 1) the history and dynamics of the Newfoundland Ice Cap during the last glaciation, from retreat across the continental shelf to final melting in the interior of the island; and 2) the history of sea-level fluctuations around Newfoundland in response to ice cap retreat and melting. Ice retreat history will be investigated through examination and field mapping of landforms and landscapes preserved from ice cap advance and retreat. A new focus in this proposal is to combine glacial landform data from the inner continental shelf, mapped using sonar surveys, with landform data onshore, mapped from aerial photographs and satellite imagery. Topics of particular research interest are the evidence for former ice streams (fast-flowing glacier ice) in the Newfoundland Ice Cap and the timing and pattern of ice-marginal retreat. Results should provide new potential for understanding the behaviour of a small maritime ice cap during an overall period of climate warming and will have immediate application to the mineral exploration industry in Newfoundland because ice transport distances under rapid flow in an ice stream may be greater than originally thought. Relative sea-level studies have gained increased attention as we attempt to forecast global sea-level responses to climate warming over the next century. Past sea-level records suggest strong regional variability in this response, primarily due to residual effects from the last glaciation. The proposed research addresses the spatial and temporal variation in postglacial relative sea-level change in Newfoundland, a region that may experience moderate to significant impacts even under the most conservative scenarios of future sea-level rise. A major focus of this research will be the collection of precise sea-level data to improve our understanding of sea-level processes, and to provide quantitative information for the modelling community.

该研究计划重点关注两个主题：1）末次冰期期间纽芬兰冰盖的历史和动态，从横跨大陆架的退缩到岛屿内部的最终融化； 2）纽芬兰周围因冰盖退缩和融化而发生的海平面波动的历史。将通过对冰盖进退所保留的地貌和景观进行检查和实地测绘来调查冰退缩的历史。 该提案的一个新重点是将利用声纳勘测绘制的内大陆架冰川地貌数据与利用航空照片和卫星图像绘制的陆上地形数据结合起来。 特别研究兴趣的主题是纽芬兰冰帽中以前的冰流（快速流动的冰川冰）的证据以及冰边缘退缩的时间和模式。 研究结果将为了解整个气候变暖期间小型海洋冰盖的行为提供新的潜力，并将立即应用于纽芬兰的矿产勘探行业，因为冰流快速流动下的冰输送距离可能比原来更大想法。 当我们试图预测下个世纪全球海平面对气候变暖的反应时，相对海平面研究受到越来越多的关注。 过去的海平面记录表明，这种反应存在很大的区域差异，这主要是由于末次冰川作用的残余影响。 拟议的研究解决了纽芬兰冰期后相对海平面变化的空间和时间变化，即使在未来海平面上升的最保守情景下，该地区也可能遭受中度至重大影响。 这项研究的一个主要重点是收集精确的海平面数据，以提高我们对海平面过程的理解，并为建模界提供定量信息。