![]() All processed, calibrated, and validated data are published in the World Data Center PANGAEA as instrument-separated data subsets ( Ehrlich et al., 2019 b, ). Therefore, the data set of the ACLOUD campaign provides comprehensive in situ and remote sensing observations characterizing the cloudy Arctic atmosphere. The data of identical instruments operated on both aircraft were merged to extend the spatial coverage of mean atmospheric quantities and turbulent and radiative flux measurement. ![]() The remote sensing methods were validated using truly collocated in situ and remote sensing observations. By combining the cloud remote sensing techniques operated on Polar 5, the synergy of multi-instrument cloud retrieval is illustrated. ![]() It is shown that the scientific analysis of the ACLOUD data benefits from the coordinated operation of both aircraft. A detailed overview of the specifications, data processing, and data quality is provided here. In addition, on Polar 5 active and passive remote sensing instruments were installed, while Polar 6 operated in situ instruments to characterize cloud and aerosol particles as well as trace gases. Both aircraft were equipped with identical instrumentation for measurements of basic meteorological parameters, as well as for turbulent and radiative energy fluxes. Two research aircraft (Polar 5 and 6) jointly performed 22 research flights over the transition zone between open ocean and closed sea ice. The objective of ACLOUD was to study Arctic boundary layer and mid-level clouds and their role in Arctic amplification. The Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign was carried out north-west of Svalbard (Norway) between 23 May and 6 June 2017. ![]()
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