The dataset consists of raw data from autonomous phase-sensitive radar (ApRES) measurements. The ApRES was operated with two bow-tie antennas on the surface in the ablation zone of the 79°N Glacier in Northeast Grenland since 2016. 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, 20 to 100 chirps were transmitted within a single measurement. These measurements were repeated at time intervals between 15 minutes and 6 hours. A raw data file contains up to 4 measurements. Background of the pRES-system is published by Nicholls et al. (2015). The processing of the data is described in Zeising et al. (2024).

Processed melt rates are published in: Zeising, Ole; Steinhage, Daniel; Neckel, Niklas; Humbert, Angelika (2024): Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.928903If you have questions, please contact Ole Zeising (ole.zeising@awi.de) or co-authors.---The folder 79NG_ApRES2b_2018_2020.zip contains raw data from 29 July 2018 to 01 February 2020. Data were recorded with a measurement interval of 2 hour and 20 chirps.This data set is a repeat of ApRES2a that is available in the same publication series.