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

这一奖项支持了一系列实地测量，这些测量将提高我们对南极东部冰盖的了解。该项目的目标是利用美国ITASE提供的陆上导线物流框架，并与美国ITASE的其他研究人员合作，使用精确的全球定位系统方法计算南极东部圆顶、海拔等高线和流线上的冰盖厚度变化率(物质平衡)。此外，将使用浅冰芯和探地雷达剖面来评估积雪速率的变异性(空间和时间)，并将能够通过测量冰运动和积冰速率的上冰川梯度来推断约200年长冰芯记录中积雪速率的真实过去气候变化。还将确定流经南极山脉的选定大型出口冰川的集水区内水流开始流动的研究模式和原因。这项工作将沿着拟议中的美国ITASE从泰勒穹顶到南极的穿越路线进行。这条路线穿过东南极高原，大致平行于横贯北极的山脉。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。预期的结果包括确定东南极冰盖罗斯冰架部分的物质平衡，改进东南极部分地区的积雪地图，在冰芯记录中反卷积气候效应对冰动力学的影响，以及对导致大出口冰川的流动开始附近的冰川条件进行分析。拟议工作的更广泛影响包括与一个由极地科学家组成的多学科小组进行合作，支持一名研究生，并产生成果，以增进对地球系统的了解，从而为合理的规划和政策决策奠定基础。

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.