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，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提供的陆地穿越物流框架，并与美国ITASE的其他研究人员合作，利用精确的全球定位系统方法，计算南极洲东部沿高程等高线和流线的圆顶上的冰盖厚度变化速率（质量平衡）。此外，将利用浅层冰芯和探地雷达剖面评估积雪积累率的时空变异性，并通过测量冰的运动和冰川上的积累率梯度，提供在~200年长的冰芯记录中推断积雪率真实的过去气候变化的能力。还将确定在流经横贯南极山脉的某些大型出水口冰川的集水区开始流水的研究模式和原因。这项工作将沿着拟议的美国ITASE从泰勒巨蛋到南极的穿越路线进行。这条路线穿过南极东部高原，与横贯南极山脉大致平行。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。预期的结果包括南极东部冰盖罗斯冰架部分的质量平衡测定、南极东部部分地区的改进积雪图、冰芯记录中气候效应对冰动力学影响的反褶积，以及对导致大型出口冰川的流流开始附近的冰川条件的分析。拟议工作的更广泛影响包括与一个多学科的极地科学家小组的合作，对一名研究生的支持，以及产生结果，这些结果将导致对地球系统的进一步了解，从而可以根据地球系统进行合理的规划和决策。

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.