This data set contains daily files of atmospheric (PS144_uoc_lhumpro-243-340_l1_tb_v01_2024.nc) and surface (PS144_uoc_lhumpro-243-340_l1_tb_sfc_v01_2024.nc) brightness temperatures measured by the Microwave Radar/Radiometer for Arctic Clouds - Passive (MiRAC-P, Mech et al., 2019) onboard the research vessel Polarstern during cruise PS144 (Rabe & Geibert, 2025) from 10 August to 7 October 2024. MiRAC-P measures brightness temperatures at six double-sided channels along the strong water vapour absorption line in the G-band (183.31 +/- 0.6 GHz to 183.31 +/- 7.5 GHz) and at 243 and 340 GHz. The instrument was mounted at the portside railing on one of the highest decks of Polarstern (lower Peildeck).Note that the surface brightness temperature files contain observations at different zenith angles and also provide atmospheric brightness temperatures at the angle corresponding to the atmospheric signal reflected by the surface. The latter is needed for surface emissivity calculations.

Each netCDF file contains either atmospheric (PS144_uoc_lhumpro-243-340_l1_tb_v01_2024.nc) or surface (PS144_uoc_lhumpro-243-340_l1_tb_v01_2024.nc) brightness temperatures measured by MiRAC-P onboard Polarstern for one day of the cruise PS144. The total number of files is 115 and the total size is about 600 MB. Each file further contains meta data about the position (latitude, longitude, height above mean sea level), the zenith angle, the quality and the frequency of the measured brightness temperature, and provides standard meteorological parameters (air temperature, pressure and relative humidity) from the weather station mounted to MiRAC-P.