Juneau Icefield Ground-Penetrating Radar Data - Snow and Firn, 2012-2021

We have consistently collected 400 MHz (megahertz) ground-penetrating radar data across the Juneau Icefield as part of the Juneau Icefield Research Program (JIRP) since 2012. We have acquired data to study snow and firn properties across the icefield in 2012, 2015, 2018, 2019, 2021. We used a geophysical survey systems incorporated (GSSI) SIR-3000 control unit during the 2012 season coupled with a GSSI Model 5103 400 MHz antenna. In all subsequent years, we used the same antenna with a GSSI SIR-4000 control unit. Surveys were conducted using snow machines and towing the antenna on a sled at speeds of 3-7 km/hr (kilometers per hour). We georeferenced the 2012 data by relating GPS points recorded every 50 meters on a Garmin GPSMap 62stc to the associated markers recorded in the radar profiles. From 2015 onwards, the SIR-4000 was directly linked to a Garmin GPSMap78 handheld GPS for georeferencing. Data were collected with a time window of 250-400 ns (nanoseconds), 2048 samples per scan, and 24 scans per second. In addition to the GPR data, we used glaciological snow pit mass balance data acquired by JIRP participants as ground truth for multiple radar profile interpretations. Data from these pits includes X, Y, Z coordinates, date and time of extraction, and depth-density measurements using a 500 cm^3 (cubic centimeter) cylinder. Herein, we include: 1) raw GPR profiles which include .DZT, .DZG, and .DZX files, 2) GPS positioning files for 2012 data, and 3) JIRP mass balance pit data for 2012 and 2021.