Comparisons of aerosol properties measured by impactors and light scattering from individual particles: refractive index,number and volume concentrations,and size distributions |
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| Institution: | 1. Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA;2. Aerosol Dynamics, Inc., Berkeley, CA 94710, USA;3. MSP Corporation, Minneapolis, MN 55414, USA;4. Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 54455, USA;1. Ecole Nationale Supérieure des Mines, SPIN-EMSE, CNRS:UMR5307, LGF, 42023 Saint-Etienne, France;2. Université de Lyon, Institut de Recherches sur la Catalyse et l’Environnement de Lyon, UMR 5256, CNRS, Université Claude Bernard Lyon 1, 2 avenue A. Einstein, 69626 Villeurbanne, France;1. Joint Mass Spectrometry Center, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum Muenchen, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany;2. Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry University of Rostock, Dr.-Lorenz-Weg 1, 18059 Rostock, Germany;3. Helmholtz Virtual Institute of Complex Molecular Systems in Environmental Health (HICE), Germany;4. Jing-Cast Ltd, Im Park 4, CH-3052 Zollikofen BE, Switzerland;5. Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, CH-5232 Villigen, Switzerland;1. Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiaotong University, China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hung Hom, Hong Kong, China;1. Fraunhofer ITEM, Department of Aerosol Technology, Nikolai-Fuchs Str. 1, 30625 Hannover, Germany;2. Altria Client Services, Research Development & Engineering, 601 E. Jackson Street, Richmond, VA 23219, USA;1. Solar-Terrestrial Environment Laboratory and Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan;2. National Traffic Safety and Environment Laboratory, 7-42-27 Jandaiji-Higashimachi, Chofu, Tokyo 182-0012, Japan;3. National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan;4. Department of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan |
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| Abstract: | The southeastern aerosol and visibility study (SEAVS) was conducted in Great Smoky Mountains National Park in summer 1995 to investigate variations in ambient aerosol size distributions and their effect on visibility. In this paper, we compare dry aerosol size distribution parameters from a MOUDI impactor and two different optical particle counters (OPCs). Size distributions from the various instruments are expressed in a common measure of size, specifically, optical and aerodynamic diameters are converted to a dry, geometric diameter basis. Comparisons of the real part of particle refractive index obtained directly from light scattering measurements and inferred from aerosol composition measurements are also shown. Real refractive indices from direct measurements and those computed from measured fine aerosol chemical composition were generally within ±0.02. Maximum differences in estimated accumulation mode integrated volume concentrations from all instruments were within ∼22%. Accumulation mode integrated number concentrations and geometric standard deviations from the two OPCs agreed within ∼30% and ∼3%, respectively. Differences between MOUDI- and OPC-derived accumulation mode number concentrations and geometric standard deviations were ∼20% and ∼8%, respectively. The average geometric volume mean diameters derived from the three instruments agreed within 15% or less. The volume median diameters obtained by fitting the CSU number concentration data to a lognormal function were typically the smallest. We show that these discrepancies can be related to the differences and biases in the measurement and data analysis techniques. |
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