Contribution of Western Antarctic Peninsula glaciers to sea level rise: Separation of the dynamic and climatic components

南极半岛西部冰川对海平面上升的贡献：动力成分和气候成分的分离

• 批准号: 1043649
• 负责人: Regine Hock
• 金额: $ 30.28万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-05-01 至 2014-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1043649&HistoricalAwards=false
• 关键词: Contribution; Western; Antarctic; Peninsula; glaciers

1043649/BraunThis award supports a project to determine the current mass balance of selected glaciers of the Western Antarctic Peninsula (WAP) and adjacent islands, including King George Island and Livingston Island. A major goal is to discriminate the climatic and dynamic components of the current mass budget. The dynamic component will be assessed using a flux gate approach. Glacier velocity fields will be derived by offset tracking on repeat SAR satellite imagery, and ice thicknesses across grounding lines or near terminus will be approximated from a new methods based on mass continuity. The surface mass balance will be computed from a spatially distributed temperature-index mass-balance model forced by temperature and precipitation data from regional climate models. Our results will provide improved mass budget estimates of Western Antarctic Peninsula glaciers and a more thorough understanding of the ratio between the climatic and dynamic components. The techniques to be developed will be applicable to other glaciers in the region allowing regional scale mass budgets to be derived. The broader impacts of this work are that glacier wastage is currently the most important contributor to global sea level rise and the Antarctic Peninsula has been identified as one of the largest single contributors. Future sea-level rise has major societal, economic and ecological implications. The activity will foster new partnerships through collaboration with European and South American colleagues. The project will form the base of of a postdoctoral research fellowship. It will also provide training of undergraduate and graduate students through inclusion of data and results in course curriculums.

1043649/Braun该奖项支持一个项目，该项目旨在确定南极半岛西部和邻近岛屿(包括乔治王岛和利文斯顿岛)选定冰川目前的物质平衡。一个主要目标是区分当前质量预算的气候和动态组成部分。动态分量将使用磁通门方法进行评估。通过对重复的SAR卫星图像进行偏移跟踪得到冰川速度场，并采用基于质量连续性的新方法来近似计算接地线或近端的冰层厚度。地表质量平衡将由一个空间分布的温度指数质量平衡模型计算，该模型受来自区域气候模型的温度和降水数据的强迫。我们的结果将改进对南极半岛西部冰川的质量预算估计，并更彻底地了解气候和动态成分之间的比率。将开发的技术将适用于该区域的其他冰川，从而可以得出区域规模的质量预算。这项工作的更广泛影响是，冰川消融目前是全球海平面上升的最重要因素，而南极半岛已被确定为最大的单一因素之一。未来海平面上升具有重大的社会、经济和生态影响。该活动将通过与欧洲和南美同事的合作促进新的伙伴关系。该项目将构成博士后研究奖学金的基础。它还将通过将数据和结果纳入课程课程，为本科生和研究生提供培训。