Tethered balloon-borne profile measurements of atmospheric properties in the cloudy atmospheric boundary layer over the Arctic sea ice during MOSAiC: Overview and first results

The tethered balloon-borne measurement system BELUGA (Balloon-bornE moduLar Utility for profilinG the lower Atmosphere) was deployed over Arctic sea ice 4 weeks in summer 2020 as part of Multidisciplinary drifting Observatory Study Climate expedition. Using BELUGA, vertical profiles dynamic, thermodynamic, aerosol particle, cloud, radiation, and turbulence properties were measured from ground up to a height 1,500 m. operated during an anomalously warm period with frequent liquid water clouds variable conditions. Three case studies phase, single-layer observed on 3 days (July 13, 23, 24, 2020) are discussed show potential collected data set comprehensively investigate cloud determining evolution inner ice. Simulated back-trajectories that have evolved within different air masses (“aged Arctic,” “advected ice,” open ocean”), which left distinct fingerprints properties. Strong top radiative cooling rates agree simulated results previous studies. weak warming at base is mostly driven by temperature profile between surface base. In-cloud induced similar strength compared former From extent mixing layer, it speculated overall stronger thus faster oceanic mass. Larger particle number concentrations larger sizes mass advected ocean.