Angular Illumination and Truncation of Three Different Integrating Nephelometers: Implications for Empirical, Size-Based Corrections

Integrating nephelometers are widely used for monitoring and research applications related to air pollution and climate. Several commercial versions of the instrument are available and are in wide use in the community. This article reports on results from a calibration and intercomparison workshop where several units of the three most widely used nephelometer models were tested with respect to their CO2 calibration accuracy and stability and non-idealities of their angular illumination function. Correction factors that result from the non-ideal illumination due to truncation of the sensing volumes in the near-forward and near-backward angular ranges and for non-Lambertian illumination from the light sources are presented, in particular for two models that have not previously been tested in this respect. The correction factors ranged from 0.95 to 1.15 depending on the model of nephelometer and aerosol size distribution. Recommendations for operational data analysis in context of these and previous performance tests are presented.

Citation proposal
Thomas Muller (Leibniz Institute for Tropospheric Reseach,) - Andreas Novak (Leibniz Institute for Tropospheric Reseach,) - Alfred Wiedensohler (Leibniz Institute for Tropospheric Reseach,) - Patrick Sheridan (NOAA/Earth System Research Laboratory,) - M. Laborde (Ecotech Pty Ltd,) - David S. Covert (Department of Atmospheric Science, University of Washington,) - Angela Marinoni (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Kornelia Imre (Department of Earth and Environmental Sciences, University of Pannonia) - Bas Henzing (TNO—Netherlands Organization for Applied Scienti?c Research,) - Jean-Claude Roger (CNRS—Université Blaise Pascal,) - Sebastiao Martins dos Santos (European Commission, Joint Research Centre, Institute for Environment and Sustainability,) - Reinhard Wilhelm (DWD, Meteorological Observatory,) - Ya-Qiang Wang (Centre for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences,) - Gerrit de Leeuw (Finnish Meteorological Institute,) (2009) . Angular Illumination and Truncation of Three Different Integrating Nephelometers: Implications for Empirical, Size-Based Corrections. Taylor & Francis Group https://geoportal.mountaingenius.org/geonetwork/srv/api/records/265478e3-052c-4b42-93df-71fe63207851

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File identifier: 265478e3-052c-4b42-93df-71fe63207851 XML

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Metadata language: eng

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Climatology, meteorology, atmosphere
Environment

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Integrating nephelometers , light scattering coefficients , particulate scattering coefficient , Non-Ideal Illumination

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air pollution , Climate , aerosol

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Date ( Publication ): 2009-06-01T00:00:00

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"Angular Illumination and Truncation of Three Different Integrating Nephelometers: Implications for Empirical, Size-Based Corrections".

Aerosol Science and Technology

Volume 43, Issue 6, pages 581-586,2009.

Muller, T., Novak, A., Wiedensohler, A., Sheridan, P., Laborde, M., David Covert, S., Marinoni, A., Imre, K., Henzing, B., Roger, J.C., Martins dos Santos, S., Wilhelm, R., Wang, Y.Q., de Leeuw, G.