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. The Small Whiskbroom Imager for atmospheric compositioN monitorinG (SWING) isa compact remote sensing instrument dedicated to mapping trace gases from anunmanned aerial vehicle (UAV). SWING is based on a compact visiblespectrometer and a scanning mirror to collect scattered sunlight. Its weight,size, and power consumption are respectively 920  g ,27 cm  ×  12 cm  ×  8  cm , and 6  W . SWING wasdeveloped in parallel with a 2.5  m flying-wing UAV. This unmannedaircraft is electrically powered, has a typical airspeed of100  km h−1 , and can operate at a maximum altitude of3  km . We present SWING-UAV experiments performed in Romania on 11 September 2014during the Airborne ROmanian Measurements of Aerosols and Trace gases(AROMAT) campaign, which was dedicated to test newly developed instruments inthe context of air quality satellite validation. The UAV was operated up to700  m above ground, in the vicinity of the large power plant ofTurceni (44.67 ∘  N, 23.41 ∘  E; 116  m a . s . l . ). TheseSWING-UAV flights were coincident with another airborne experiment using theAirborne imaging differential optical absorption spectroscopy (DOAS)instrument for Measurements of Atmospheric Pollution (AirMAP), and withground-based DOAS, lidar, and balloon-borne in situ observations. The spectra recorded during the SWING-UAV flights are analysed with the DOAStechnique. This analysis reveals NO2 differential slant columndensities (DSCDs) up to 13 ± 0.6 × 10 16 molec cm−2 .These NO2 DSCDs are converted to vertical column densities (VCDs) byestimating air mass factors. The resulting NO2 VCDs are up to 4.7 ± 0.4 × 10 16 molec cm−2 . The water vapour DSCDmeasurements, up to 8 ± 0.15 × 10 22 molec cm−2 , are usedto estimate a volume mixing ratio of water vapour in the boundary layer of 0.013±0.002 mol mol−1 . These geophysical quantities arevalidated with the coincident measurements.

atmospheric measurement techniques

The Small Whiskbroom Imager for atmospheric compositioN monitorinG (SWING) and its operations from an unmanned aerial vehicle (UAV) during the AROMAT campaign