LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles – Part 2: First results from balloon and unmanned aerial vehicle flights
2015
In the companion (Part I) paper, we have described and evaluated a new versatile optical
particle counter/sizer named LOAC (Light Optical Aerosol Counter), based on scattering measurements at angles of 12 and 60 •. That allows for some typology identification of particles (droplets, carbonaceous, salts, and
mineral dust) in addition to size-segregated counting in a large diameter range from 0.2 µm up to possibly more than 100 µm depending on sampling conditions (Renard et al., 2016). Its capabilities overpass those of preceding optical
particle counters(OPCs) allowing the characterization of all kind of aerosols from submicronic-sized absorbing carbonaceous particles in polluted air to very coarse particles (> 10–20 µm in diameter) in desert dust plumes or fog and clouds. LOAC's light and compact design allows measurements under all kinds of
balloons, on-board unmanned aerial vehicles (UAVs) and at Published by
CopernicusPublications on behalf of the European Geosciences Union. 3674 J.-B. Renard et al.: LOAC: a counter/sizer for ground-based and
balloonmeasurements – Part 2 ground level. We illustrate here the first LOAC airborne results obtained from a UAV and a variety of scientific
balloons. The UAV was deployed in a peri-urban environment near Bordeaux in France.
Balloonoperations include (i) tethered
balloonsdeployed in urban environments in Vi-enna (Austria) and Paris (France), (ii) pressurized
balloonsdrifting in the lower troposphere over the western Mediter-ranean (during the Chemistry-Aerosol Mediterranean Experiment – ChArMEx campaigns), (iii) meteorological sounding
balloonslaunched in the western Mediterranean region (ChArMEx) and from Aire-sur-l'Adour in southwestern France (VOLTAIRE-LOAC campaign). More focus is put on measurements performed in the Mediterranean during (ChArMEx) and especially during African dust transport events to illustrate the original capability of
balloon-borne LOAC to monitor in situ coarse
mineral dustparticles. In particular, LOAC has detected unexpected large particles in desert sand plumes.
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