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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 5
Atmos. Meas. Tech., 8, 1965–1979, 2015
https://doi.org/10.5194/amt-8-1965-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 8, 1965–1979, 2015
https://doi.org/10.5194/amt-8-1965-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 06 May 2015

Research article | 06 May 2015

The "dual-spot" Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation

L. Drinovec1, G. Močnik1, P. Zotter2,*, A. S. H. Prévôt2, C. Ruckstuhl3, E. Coz4, M. Rupakheti5, J. Sciare6, T. Müller7, A. Wiedensohler7, and A. D. A. Hansen1,8 L. Drinovec et al.
  • 1Aerosol d.o.o., 1000 Ljubljana, Slovenia
  • 2Paul Scherrer Institute, 5232 Villigen, Switzerland
  • 3inNET Monitoring AG, 6460 Altdorf, Switzerland
  • 4Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, 28040 Madrid, Spain
  • 5Institute for Advanced Sustainability Studies, 14467 Potsdam, Germany
  • 6Laboratoire du Climat et de l'Environnement, CEA/Orme des Merisiers, 91191 Gif-sur-Yvette, France
  • 7Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany
  • 8Magee Scientific Corp., Berkeley, California, CA 94703, USA
  • *now at: Lucerne School of Engineering and Architecture, Bioenergy Research, Lucerne University of Applied Sciences and Arts, Horw 6048, Switzerland

Abstract. Aerosol black carbon is a unique primary tracer for combustion emissions. It affects the optical properties of the atmosphere and is recognized as the second most important anthropogenic forcing agent for climate change. It is the primary tracer for adverse health effects caused by air pollution. For the accurate determination of mass equivalent black carbon concentrations in the air and for source apportionment of the concentrations, optical measurements by filter-based absorption photometers must take into account the "filter loading effect". We present a new real-time loading effect compensation algorithm based on a two parallel spot measurement of optical absorption. This algorithm has been incorporated into the new Aethalometer model AE33. Intercomparison studies show excellent reproducibility of the AE33 measurements and very good agreement with post-processed data obtained using earlier Aethalometer models and other filter-based absorption photometers. The real-time loading effect compensation algorithm provides the high-quality data necessary for real-time source apportionment and for determination of the temporal variation of the compensation parameter k.

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We present a new real-time algorithm for compensation of the filter-loading effect in filter photometers, based on a two parallel spot measurement of optical absorption. This algorithm has been incorporated into the new Aethalometer AE33. Intercomparison studies show excellent reproducibility of the AE33 measurements and very good agreement with post-processed data obtained using earlier aethalometer models and other filter-based absorption photometers.
We present a new real-time algorithm for compensation of the filter-loading effect in filter...
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