Ultra-wideband radar data over the shear margins and along flow lines at the onset region of the Northeast Greenland Ice Stream (NEGIS)

We present a high-resolution airborne radar data set (EGRIP-NOR-2018) for the onset region of the Northeast Greenland Ice Stream (NEGIS). The radar data has been acquired in May 2018 with the Alfred Wegener Institute (AWI) multichannel ultra-wideband radar mounted on the Polar6 aircraft. Radar profiles cover an area of ~24 000 km^2 and extend over the well-defined shear margins of the NEGIS. The survey area is centred at the location of the drill site of the East Greenland Ice-Core Project (EastGRIP) and several radar lines intersect at this location. The survey layout is designed to (1) map the stratigraphic signature of the shear margins with radar profiles aligned perpendicular to ice flow and (2) trace the radar stratigraphy along several flow lines. While we are able to resolve radar reflections in the deep stratigraphy, we cannot fully resolve the steeply inclined reflections at the tightly folded shear margins in the lower part of the ice column. […]

本报告呈现了一组高分辨率机载雷达数据集（EGRIP-NOR-2018），该数据集针对东北格陵兰冰流（NEGIS）的起始区域。雷达数据采集于2018年5月，由阿尔弗雷德·魏格纳研究所（AWI）的多通道超宽带雷达搭载于Polar6飞机上完成。雷达剖面覆盖面积约24,000平方公里，并横跨NEGIS明确界定的剪切边缘。调查区域以东部格陵兰冰芯项目（EastGRIP）的钻探地点为中心，多条雷达线在此交汇。调查布局旨在（1）通过垂直于冰流方向的雷达剖面绘制剪切边缘的地层特征，以及（2）追踪多条流线上的雷达地层结构。尽管我们能够解析深层地层中的雷达反射，但在冰柱下部的紧密褶皱剪切边缘处，我们无法完全解析出陡峭倾斜的雷达反射。