The dataset consists of raw data from autonomous phase-sensitive radar (ApRES) measurements. The ApRES with two broadband frame antennas was operated within a trench (~10 m below the surface) at the EastGRIP drill site on the Greenland Ice Sheet (-35.997°W, 75.630°N) between 08/2017 - 04/2018 and 08/2018 - 05/2019 with a one day interval. These Lagrangian measurements allow the estimation of basal melt rates based on estimated vertical displacements of englacial and basal reflections.The ApRES is an autonomous operating frequency-modulated continuous wave (FMCW) radar that transmits a tone sweep – called chirp – ranging from 200 to 400 MHz over a period of one second. In order to improve the signal-to-noise ratio, 100 chirps were transmitted within a single measurement. These measurements were repeated every 24 hours.Background of the pRES-system is published by Brennan et al. (2014) and Nicholls et al. (2015). The processing of the data is described in Stewart (2018), Stewart et al. (2019) and Vankova et al. (2020).

Data were measured in the field by Ole Zeising and Angelika Humbert. This dataset has been planned by Angelika Humbert.Data has been acquired at the EGRIP camp that kindly hosted this activity as an associate project. EGRIP is directed and organized by the Centre for Ice and Climate at the Niels Bohr Institute, University of Copenhagen. It is supported by funding agencies and institutions in Denmark (A. P. Møller Foundation, University of Copenhagen), USA (US National Science Foundation, Office of Polar Programs), Germany (Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research), Japan (National Institute of Polar Research and Arctic Challenge for Sustainability), Norway (University of Bergen and Trond Mohn Foundation), Switzerland (Swiss National Science Foundation), France (French Polar Institute Paul-Emile Victor, Institute for Geosciences and Environmental research), Canada (University of Manitoba) and China (Chinese Academy of Sciences and Beijing Normal University).If you have questions, please contact Ole Zeising (ole.zeising@awi.de) or co-authors.