Minimizing light absorption measurement artifacts of the Aethalometer: evaluation of five correction algorithms

Atmospheric Measurement Techniques - Tập 3 Số 2 - Trang 457-474
Martine Collaud Coen1, E. Weingartner2, Arnoud Apituley3, Darius Čeburnis4, R. Fierz‐Schmidhauser2, H. Flentje5, Bas Henzing6, Mathew R. Heal4, M. Moerman3, Andreas Petzold7, Otmar Schmid8,9, Urs Baltensperger2
1MeteoSwiss, Aerological Station, Les Invuardes, 1530 Payerne, Switzerland
2Laboratory of Atmospheric Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
3National Institute for Public Health and the Environment, Bilthoven, The Netherlands
4School of Physics / Environmental Change Institute, National University of Ireland, Galway; Ireland
5Deutscher Wetterdienst (DWD), Meteorologisches Observatorium (MOHP), Albin-Schwaiger-Weg 10, 82383 Hohenpeissenberg, Germany
6Netherlands Organisation for Applied Scientific Research, TNO, 80015 Utrecht, The Netherlands
7Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt, 82234 Wessling, Germany
8Missouri University of Science and Technology, Center of Excellence for Aerospace Particulate Emissions Reduction Research, Rolla, MO 65409, USA
9formerly at: Max Planck Institute for Chemistry, Biogeochemistry Department, 55020 Mainz, Germany

Tóm tắt

Abstract. The aerosol light absorption coefficient is an essential parameter involved in atmospheric radiation budget calculations. The Aethalometer (AE) has the great advantage of measuring the aerosol light absorption coefficient at several wavelengths, but the derived absorption coefficients are systematically too high when compared to reference methods. Up to now, four different correction algorithms of the AE absorption coefficients have been proposed by several authors. A new correction scheme based on these previously published methods has been developed, which accounts for the optical properties of the aerosol particles embedded in the filter. All the corrections have been tested on six datasets representing different aerosol types and loadings and include multi-wavelength AE and white-light AE. All the corrections have also been evaluated through comparison with a Multi-Angle Absorption Photometer (MAAP) for four datasets lasting between 6 months and five years. The modification of the wavelength dependence by the different corrections is analyzed in detail. The performances and the limits of all AE corrections are determined and recommendations are given.

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Atmospheric Measurement Techniques

Tập 3 Số 2

457-474

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