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. The present study investigates and compares the ground and in-flightperformance of three miniaturized aerosol absorption sensors integratedon board small-sized Unmanned Aerial Systems (UASs). These sensors wereevaluated during two contrasted field campaigns performed at an urban site,impacted mainly by local traffic and domestic wood burning sources (Athens,Greece), and at a remote regional background site, impacted by long-rangetransported sources including dust (Cyprus Atmospheric Observatory, AgiaMarina Xyliatou, Cyprus). The miniaturized sensors were first intercompared at the ground-levelagainst two commercially available instruments used as a reference. Themeasured signal of the miniaturized sensors was converted into theabsorption coefficient and equivalent black carbon concentration (eBC). Whenapplicable, signal saturation corrections were applied, following thesuggestions of the manufacturers. The aerosol absorption sensors exhibitedsimilar behavior against the reference instruments during the two campaigns,despite the diversity of the aerosol origin, chemical composition, sources,and concentration levels. The deviation from the reference during bothcampaigns concerning (eBC) mass was less than 8 %, while for the absorptioncoefficient it was at least 15 %. This indicates that those sensors thatreport black carbon mass are tuned and corrected to measure eBC more accurately than the absorption coefficient. The overall potential use of miniature aerosol absorption sensors on boardsmall UASs is also illustrated. UAS-based absorption measurements were usedto investigate the vertical distribution of eBC over Athens up to 1 km abovesea level during January 2016, exceeding the top of the planetary boundarylayer (PBL). Our results reveal a heterogeneous boundary layer concentrationof absorbing aerosol within the PBL intensified in the early morning hoursdue to the concurrent peak traffic emissions at ground-level and the fastdevelopment of the boundary layer. After the full development of the PBL,homogenous concentrations are observed from 100 m a.g.l. to the PBL top.

On-flight intercomparison of three miniature aerosol absorption sensors using unmanned aerial systems (UASs)