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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 3 | Copyright
Atmos. Meas. Tech., 10, 1043-1059, 2017
https://doi.org/10.5194/amt-10-1043-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 16 Mar 2017

Research article | 16 Mar 2017

The filter-loading effect by ambient aerosols in filter absorption photometers depends on the coating of the sampled particles

Luka Drinovec1,2, Asta Gregorič3, Peter Zotter4,a, Robert Wolf4, Emily Anne Bruns4, André S. H. Prévôt4, Jean-Eudes Petit5,6,b, Olivier Favez5, Jean Sciare6,7, Ian J. Arnold8,c, Rajan K. Chakrabarty8,d, Hans Moosmüller8, Agnes Filep9, and Griša Močnik1,2 Luka Drinovec et al.
  • 1Research and Development Department, Aerosol d.o.o., Ljubljana, Slovenia
  • 2Condensed Matter Physics Department, Jožef Stefan Institute, Ljubljana, Slovenia
  • 3Center for Atmospheric Research, University of Nova Gorica, Nova Gorica, Slovenia
  • 4Laboratory of Atmospheric Chemistry, Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland
  • 5Institut National de l'Environnement Industriel et des Risques (DRC/CARA/CIME), Verneuil-en-Halatte,France
  • 6Laboratoire des Sciences du Climat et de l'Environnement (CNRS-CEA-UVSQ), CEA Orme des Merisiers, Gif-sur-Yvette, France
  • 7Energy Environment and Water Research Center, The Cyprus Institute, Nicosia, Cyprus
  • 8Desert Research Institute, Nevada System of Higher Education, Reno, USA
  • 9MTA-SZTE Research Group on Photoacoustic Spectroscopy, Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
  • anow at: Lucerne University of Applied Sciences and Arts, School of Engineering and Architecture, Bioenergy Research, Horw, Switzerland
  • bnow at: Air Lorraine, Metz, France
  • cnow at: College of Optical Sciences, University of Arizona, Tucson, AZ, USA
  • dnow at: Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, MO, USA

Abstract. Black carbon is a primary aerosol tracer for high-temperature combustion emissions and can be used to characterize the time evolution of its sources. It is correlated with a decrease in public health and contributes to atmospheric warming. Black carbon measurements are usually conducted with absorption filter photometers, which are prone to several artifacts, including the filter-loading effect – a saturation of the instrumental response due to the accumulation of the sample in the filter matrix. In this paper, we investigate the hypothesis that this filter-loading effect depends on the optical properties of particles present in the filter matrix, especially on the black carbon particle coating. We conducted field campaigns in contrasting environments to determine the influence of source characteristics, particle age and coating on the magnitude of the filter-loading effect. High-time-resolution measurements of the filter-loading parameter in filter absorption photometers show daily and seasonal variations of the effect. The variation is most pronounced in the near-infrared region, where the black carbon mass concentration is determined. During winter, the filter-loading parameter value increases with the absorption Ångström exponent. It is suggested that this effect is related to the size of the black carbon particle core as the wood burning (with higher values of the absorption Ångström exponent) produces soot particles with larger diameters. A reduction of the filter-loading effect is correlated with the availability of the coating material. As the coating of ambient aerosols is reduced or removed, the filter-loading parameter increases. Coatings composed of ammonium sulfate and secondary organics seem to be responsible for the variation of the loading effect. The potential source contribution function analysis shows that high values of the filter-loading parameter in the infrared are indicative of local pollution, whereas low values of the filter-loading parameter result from ageing and coating during long-range transport. Our results show that the filter-loading parameter can be used as a proxy for determination of the particle coating, thus allowing for differentiation between local/fresh and transported/aged particles.

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Black carbon measurements are usually conducted with absorption filter photometers, which are prone to the filter-loading effect – a saturation of the instrumental response due to the accumulation of the sample in the filter matrix. In this paper, we conducted several field campaigns to investigate the hypothesis that this filter-loading effect depends on the optical properties of particles present in the filter matrix, especially on the coating of black carbon particles.
Black carbon measurements are usually conducted with absorption filter photometers, which are...
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