Internal reflecting horizon 4 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.

本数据集收录了2019/20南极夏季科考季期间，于东南极高原（East Antarctic Plateau）穹顶C（Dome C）区域的小穹顶C（Little Dome C）开展雷达测量过程中，通过无线电回声测深（radio-echo sounding）追踪得到的内部反射层（internal reflecting horizons, IRH）数据。本数据集关联发表文献：Chung A. 等（2023）的研究成果。该数据采集于2019-2020南极科考季，使用由阿拉巴马大学（The 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）合作研发的小穹顶C-甚高频（Very High Frequency, VHF）多通道相干雷达测深仪（LDC-VHF）完成。本次测量覆盖小穹顶C的A、B两个区块（引自Lilien等，2021），旨在为Beyond EPICA Oldest Ice钻探项目选定精准钻探点位。数据集包含12条平行测线，以系统覆盖方式覆盖A、B区块，作业区域面积约5×8 km²。数据集中共包含19个内部反射层、基底单元层与冰床界面，均由Ailsa Chung借助Paradigm Geophysical公司的Echos软件地震解释环境手动追踪得到。每个内部反射层对应一个文本文件，采用制表符分隔格式，存储深度与双向旅行时两类数据。深度转换采用波速参数c=0.1685 m/μs，并施加了10米的粒雪校正。内部反射层的空间分辨率约为3.5米。