Present-day King George Island ice cap geometry measured by ground penetrating radar in 2008/09@en

We present a consistent data set for the ice thickness, the bedrock topography and the ice surface topography of the King George Island ice cap (Arctowski Icefield and the adjacent central part). The data set is composed of groundbased and airborne Ground Penetrating Radar (GPR) and differential GPS (DGPS) measurements, obtained during several field campaigns. The data set incorporates groundbased measurements in the safely accessible inner parts and airborne measurements in the heavily crevassed coastal areas of the ice cap. In particular, the inclusion of airborne GPR measurements with the 30MHz BGR-P30-System developed at the Institute of Geophysics (University of Münster) completes the picture of the ice geometry substantially. The compiled digital elevation model of the bedrock shows a rough, highly variable topography with pronounced valleys, ridges, and troughs. The mean ice thickness is approx. 238m, with a maximum value of approx. 400m in the surveyed area. Noticeable are bounded areas in the bedrock topography below sea level where marine based ice exists.本研究构建了一套标准化的乔治王岛冰盖（含阿尔赫蒂科夫斯基冰原及其邻近中部区域）的冰厚、基岩地形与冰面地形数据集。该数据集由多次野外考察期间获取的地面与机载探地雷达（Ground Penetrating Radar, GPR）、差分GPS（Differential GPS, DGPS）观测数据组成。数据集覆盖了冰盖可安全进入的内部区域的地面观测数据，以及冰盖多裂缝沿海区域的机载观测数据。尤为重要的是，本次纳入了由明斯特大学地球物理研究所研发的30MHz BGR-P30-System机载探地雷达观测数据，大幅完善了冰盖几何形态的全貌。所构建的基岩数字高程模型呈现出崎岖且高度多变的地形特征，发育有显著的山谷、山脊与槽谷。研究区域内的平均冰厚约为238米，最大冰厚可达约400米。值得注意的是，基岩地形中存在多处低于海平面的封闭区域，此处发育有海基冰。