Articles | Volume 8, issue 5
https://doi.org/10.5194/amt-8-1965-2015
https://doi.org/10.5194/amt-8-1965-2015
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. Drinovec, G. Močnik, P. Zotter, A. S. H. Prévôt, C. Ruckstuhl, E. Coz, M. Rupakheti, J. Sciare, T. Müller, A. Wiedensohler, and A. D. A. Hansen

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Cited articles

ACTRIS, ACTRIS Intercomparison Workshop for Integrating Nephelometer and Absorption Photometers, http://www.wmo-gaw-wcc-aerosol-physics.org/files/ ACTRIS-intercomparison-workshop-integrating-nephelometer- and-absorption-photometer-02-03-2013.pdf (last access: 1 May 2015), 2014a.
ACTRIS, ACTRIS Workshop on the Reference method for Multi-Wavelength Absorption, http://www.wmo-gaw-wcc-aerosol-physics.org/files/ ACTRIS-Reference-Method-Multi-wavelength-Absorption-03-2013.pdf (last access: 1 May 2015), 2014b.
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Arnott, W. P., Hamasha, K., Moosmuller, H., Sheridan, P. J., and Ogren, J. A.: Towards aerosol light-absorption measurements with a 7-wavelength Aethalometer: evaluation with a photoacoustic instrument and 3-wavelength nephelometer, Aerosol Sci. Tech., 39, 17–29, https://doi.org/10.1080/027868290901972, 2005.
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Short summary
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.