Internal reflecting horizon 3 at Little Dome C, Antarctica

This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.

本数据集为2019/2020年南极夏季在南极东部高原穹顶C（Dome C）区域的小穹顶C（Little Dome C）开展的雷达勘探中追踪得到的无线电回声测深（radio-echo sounding）内部反射层（internal reflecting horizons, IRH）数据集。本数据集关联的已发表文献为：Chung, A.等人（2023）的研究成果。本次数据采集于2019-2020年南极野外季的雷达勘探工作，所用设备为由阿拉巴马大学（University of Alabama, UA）、哥本哈根大学（University of Copenhagen, CPH）与阿尔弗雷德·魏格纳研究所（Alfred Wegener Institute, AWI）联合研发的小穹顶C甚高频（Little Dome C-Very High Frequency, LDC-VHF）多通道相干雷达测深仪。本次勘探覆盖小穹顶C的A、B两个区块（Lilien等，2021），旨在为超越EPICA古老冰芯钻探项目（Beyond EPICA Oldest Ice drilling project）选定精准的钻探点位。本数据集包含12条测线，以平行剖面形式系统性覆盖A、B两个区块，勘探区域总面积约为5×8平方千米。数据集中共包含19个内部反射层、基底单元层以及冰床界面，均由艾尔莎·钟（Ailsa Chung）使用Paradigm Geophysical公司的Echos软件地震处理环境手动追踪得到。每个内部反射层对应一个文本文件，采用制表符分隔格式存储，文件中同时包含深度与双向旅行时间数据。深度转换采用声速c=0.1685米/微秒，并进行了10米的粒雪层校正。内部反射层数据的空间分辨率约为3.5米。