Ice Dynamics and Surface Glaciology along US ITASE Traverse Routes in East Antarctica

该奖项支持一系列实地测量，将提高我们对东南极冰盖的理解。 该项目的目标是利用美国ITASE提供的陆上穿越物流框架，并与其他美国ITASE调查人员合作，利用精确的全球定位系统方法计算东南极洲圆顶、沿着海拔等高线和沿着流线的冰盖厚度变化率（质量平衡）。 此外，还将利用浅冰芯和地面穿透雷达剖面法评估积雪率的变化（空间和时间），并将提供通过测量冰的运动和冰川上的积雪率梯度，从约200年的冰芯记录中推断积雪率过去的真实气候变化的能力。 还将确定流经跨南极山脉的选定大型出口冰川集水区中流动的研究模式和原因。 工程将沿着拟定的美国ITASE导线路线从泰勒穹到南极进行。这条路线穿越东南极高原，大致平行于横贯南极山脉。计划进行正交卫星穿越，每一次都将沿着选定的主要出口冰川的流线进行。预期成果包括确定东南极冰盖罗斯冰架部分的质量平衡，改进东南极部分地区的积雪图，冰芯记录中气候效应对冰动力学效应的反卷积，以及分析导致大型出口冰川的流动开始附近的冰川学条件。拟议工作的更广泛影响包括：与一个多学科极地科学家小组合作，支助一名研究生，以及产生将导致更好地了解地球系统的成果，从而可据以作出合理的规划和政策决定。

This award supports a series of field measurements that will improve our understanding of the East Antarctic ice sheet. The objectives of this project are to take advantage of the overland traverse logistics framework provided by US ITASE and to collaborate with other US ITASE investigators to calculate rates of ice sheet thickness change (mass balance) on domes, along elevation contours and along flow lines in East Antarctica using precise global positioning system methods. In addition, the variability (both spatial and temporal) in snow accumulation rates will be assessed using shallow ice cores and ground-penetrating radar profiling, and will provide the capability to deduce true past climate variation in accumulation rates in ~200-year long ice core records by measuring ice motion and upglacier gradients in accumulation rate. Study patterns and causes of the onset of streaming flow in the catchments of selected large outlet glaciers draining through the Transantarctic Mountains will also be determined. The work will be conducted along the proposed US ITASE traverse route from Taylor Dome to South Pole. This route travels across the East Antarctic plateau, roughly parallel to the Transantarctic Mountains. Orthogonal satellite traverses are planned, each of which will follow a flow line of selected major outlet glaciers. The expected results include mass balance determinations for the Ross Ice Shelf sector of the East Antarctic Ice Sheet, an improved snow accumulation map for portions of East Antarctica, the deconvolution of ice dynamics effects from climate effects in ice core records, and an analysis of glaciological conditions near the onset of streaming flow leading to large outlet glaciers. The broader impacts of the proposed work include the collaboration with a multidisciplinary group of polar scientists, support of a graduate student and the production of results that will lead to an improved understanding of the Earth system from which sound planning and policy decisions can be based.