2017 GPR Observations of the Whillans and Mercer Ice Streams and Modeling Results

Abstract: The dataset includes GPS coordinates for crevasse/fracture locations picked from 350MHz and 400Mhz frequency GPR dataset in the Whillans/Mercer Shear Margin along the SALSA traverse route with associated kinematic outputs for each feature (shear strain rate, vorticity, dilatation). GPS coordinates are in the Antarctic Polar Stereographic projection (EPSG:3031). The dataset also includes initialization and output files of a numerical ice flow simulation of the region . The Ice Sheet System Model (ISSM) model was used to solve a 100 year transient stress balance solution of the region with ~10 kPA/yr friction increase downstream of the shear margin between the Whillans and Mercer ice streams.摘要：本数据集涵盖沿SALSA勘察路线、取自威兰斯/默瑟剪切边缘的350MHz与400MHz频率探地雷达（Ground Penetrating Radar, GPR）数据集中标注的冰裂缝/断裂位置的GPS坐标，以及各对应特征的运动学输出参数（剪切应变率、涡度、膨胀率）。该GPS坐标采用南极极射赤平投影（EPSG:3031）。本数据集同时包含该区域数值冰流模拟的初始化文件与输出结果文件；研究采用冰盖系统模型（Ice Sheet System Model, ISSM）对该区域开展了百年尺度的瞬态应力平衡求解，其中威兰斯冰流与默瑟冰流之间剪切边缘下游区域的摩擦速率以约10千帕/年的幅度递增。