Ground-penetrating radar profiles from King Col and Eclipse Icefield; Alaska 2016-2017

The overall project aimed to address the lack of sufficient understanding of late Holocene precipitation in the Northeast Pacific region using field measurements, remote sensing, and numerical reanalysis methods. The Eclipse Icefield is one of the largest icefields in the St. Elias Range and supplies ice to some of North America’s largest glaciers. The specific objectives of the project were to 1) develop bedrock topography maps of the surveyed sites, 2) determine surface velocities at all sites, 3) map near-surface spatial accumulation rate patterns, 4) trace internal isochrones at each site, 5) estimate ice deformation effects on layer thinning, 6) produce updated and corrected accumulation time series, and 7) compare corrected records from Mt. Hunter and St. Elias ice cores to evaluate spatial precipitation patterns over the past millennium. The purpose of this Ground-Penetrating Radar (GPR) data set was to 1) determine ice thickness at each site, 2) map snow and ice layer thickness and estimate deformation, 3) determine the location of internal isochrones.本整体研究项目旨在通过实地测量、遥感技术与数值再分析手段，解决东北太平洋地区晚全新世降水研究认知不足的问题。埃利普斯冰原（Eclipse Icefield）是圣伊莱亚斯山脉（St. Elias Range）规模最大的冰原之一，为北美数条大型冰川提供冰源。本项目的具体研究目标包括：1）绘制调查点位的基岩地形地图；2）测定所有点位的冰面运动速率；3）绘制近地表空间积雪积累率分布模式；4）追踪各点位的内部等时层；5）估算冰体变形对冰层减薄的影响；6）生成更新并校正后的积雪积累时间序列；7）对比亨特山（Mt. Hunter）与圣伊莱亚斯山脉冰芯的校正记录，以评估过去千年间的区域降水空间分布模式。本次探地雷达（Ground-Penetrating Radar, GPR）数据集的构建目的为：1）测定各点位的冰体厚度；2）绘制冰雪层厚度分布并估算变形情况；3）确定内部等时层的空间位置。