LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles – Part 1: Principle of measurements and instrument evaluation
- 1LPC2E-CNRS/Université d'Orléans, 3A avenue de la recherche scientifique, 45071 Orléans, France
- 2LSCE-CEA/IPSL, CEA Saclay 701, 91191 Gif-sur-Yvette, France
- 3Environnement-SA, 111 boulevard Robespierre, BP 4513, 78304, Poissy, France
- 4Groupe Aerophile, 106 avenue Felix Faure, 75015 Paris, France
- 5Centre National d'Etudes Spatiales (CNES), DCT/BL/NB, 18 avenue Edouard Belin, 31401 Toulouse CEDEX 9, France
- 6Laboratoire d'Aérologie/Université Paul Sabatier, 14 avenue Edouard Belin 31400 Toulouse, France
- 7Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, Gif-sur-Yvette, 91192, France
- 8MeteoModem, Rue de Bessonville, 77760 Ury, France
- 9LMD/IPSL – Ecole Polytechnique, Route de Saclay, 91128 Palaiseau CEDEX, France
- 10HYGEOS /LMD/IPSL – Ecole Polytechnique – Route de Saclay, 91128 Palaiseau CEDEX, France
- 11University of Reykjavik, Iceland
- 12Agricultural University of Iceland, Keldnaholt, 112 Reykjavik, Iceland
- 13IPSL (UPMC/UVSQ), 4 place Jussieu, Boîte 101, 75252 Paris CEDEX 05, France
- 14Fly-n-Sense, 25 rue Marcel Issartier, 33700 Mérignac
- 15Zentralanstalt für Meteorologie und Geodynamik, Wien, Austria
- 16Université d'Auvergne/LPC2E, Paul Constans, Rue Christophe Thivrier, BP 415, 03107 Montluçon CEDEX, France
Abstract. The study of aerosols in the troposphere and in the stratosphere is of major importance both for climate and air quality studies. Among the numerous instruments available, aerosol particles counters provide the size distribution in diameter range from few hundreds of nm to few tens of μm. Most of them are very sensitive to the nature of aerosols, and this can result in significant biases in the retrieved size distribution. We describe here a new versatile optical particle/sizer counter (OPC) named LOAC (Light Optical Aerosols Counter), which is light and compact enough to perform measurements not only at the surface but under all kinds of balloons in the troposphere and in the stratosphere. LOAC is an original OPC performing observations at two scattering angles. The first one is around 12°, and is almost insensitive to the nature of the particles; the second one is around 60° and is strongly sensitive to the refractive index of the particles. By combining measurement at the two angles, it is possible to retrieve accurately the size distribution and to estimate the nature of the dominant particles (droplets, carbonaceous, salts and mineral particles) in several size classes. This speciation is based on calibration charts obtained in the laboratory. Several campaigns of cross-comparison of LOAC with other particle counting instruments and remote sensing photometers have been conducted to validate both the size distribution derived by LOAC and the retrieved particle number density. The speciation of the aerosols has been validated in well-defined conditions including urban pollution, desert dust episodes, fog, and cloud. Comparison with reference aerosol mass monitoring instruments also shows that the LOAC measurements can be successfully converted to mass concentrations. All these tests indicate that no bias is present in the LOAC measurements and in the corresponding data processing.
J.-B. Renard et al.
J.-B. Renard et al.
J.-B. Renard et al.
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