Deglacial ice dynamics glacio-isostatic adjustments and relative sea-level history in Newfoundland

纽芬兰冰消冰动力学冰川均衡调整和相对海平面历史

• 批准号: 203526-2007
• 负责人: Bell, Trevor
• 金额: $ 2.21万
• 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: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=366125
• 关键词: Deglacial; ice; dynamics; glacio; isostatic

This research focuses on two themes: the dynamics of the Newfoundland ice cap during the last glaciation from retreat offshore to final melting in the interior; and the history of sea-level fluctuations around Newfoundland in response to deglaciation. Deglacial dynamics will be investigated through examination of the "Digital Landforms Database of Newfoundland" and field mapping of glacial landforms.  A new initiative in this proposal is to combine glacial landform data from the seabed offshore, mapped using multibeam sonar, with landform data onshore, mapped from aerial photographs and satellite imagery.  Topics of particular research interest are the evidence for former ice streams in the Newfoundland ice cap and the timing and configuration of ice-marginal retreat.  Results should provide new potential for drift prospecting studies and will have immediate application to the mineral exploration industry in Newfoundland.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, specifically the glacio-isostatic evolution of Newfoundland, and to provide quantitative information for the modelling community.  Application of glacial systems modelling to questions of sea-level history requires excellent data to constrain the models.       My program is strongly interdisciplinary in nature, involving collaboration with scientists from archaeology, biology, geology, marine geophysics, and physics.   There is also a strong emphasis on graduate training across these disciplines and this is reflected in the number of proposed co-supervised PhD and MSc students.

这项研究集中于两个主题：最后一次冰川从近海消退到内陆最终融化期间纽芬兰冰盖的动力学；以及纽芬兰周围海平面因冰川消融而波动的历史。将通过检查“纽芬兰数字地貌数据库”和冰川地貌实地测绘来研究冰川动力学。这项提议的一项新举措是将使用多波束声纳测绘的近海海床冰川地貌数据与陆上地貌数据相结合，从航空照片和卫星图像绘制的地图。特别令人感兴趣的研究主题是纽芬兰冰帽中以前的冰流的证据，以及冰缘退缩的时间和形态。这些结果应该会为漂流勘探研究提供新的潜力，并将立即应用于纽芬兰的矿产勘探行业。随着我们试图预测下个世纪全球海平面对气候变暖的反应，相对海平面研究获得了越来越多的关注。过去的海平面记录表明，这种反应具有强烈的区域变异性。主要是由于上一次冰川的残余影响。这项拟议的研究解决了纽芬兰冰后相对海平面变化的时空变化，即使在最保守的未来海平面上升情景下，纽芬兰也可能经历中等到重大的影响。这项研究的主要重点将是收集准确的海平面数据，以提高我们对海平面过程的理解，特别是纽芬兰的冰川均衡演化，并为模型界提供定量信息。冰川系统模型在海平面历史问题上的应用需要优秀的数据来约束模型。他说，我的项目在性质上具有很强的跨学科性质，涉及到与考古学、生物学、地质学、海洋地球物理和物理学的科学家的合作。他说，还非常重视跨这些学科的研究生培训，这一点反映在拟议的共同指导的博士和硕士学生的数量上。