Brightness temperatures of the surface and atmosphere at 183-340 GHz on Polarstern cruise PS149

This data set contains daily files of atmospheric (PS149_uoc_lhumpro-243-340_l1_tb_v01_2025*.nc) and surface (PS149_uoc_lhumpro-243-340_l1_tb_sfc_v01_2025*.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 PS149 from 4 July to 29 August 2025. 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).