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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 7
Atmos. Meas. Tech., 9, 3205–3222, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 9, 3205–3222, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 22 Jul 2016

Research article | 22 Jul 2016

Intercomparison of aerosol extinction profiles retrieved from MAX-DOAS measurements

U. Frieß1, H. Klein Baltink2, S. Beirle3, K. Clémer4,a, F. Hendrick4, B. Henzing5, H. Irie6, G. de Leeuw5,7,8, A. Li9, M. M. Moerman5, M. van Roozendael4, R. Shaiganfar3, T. Wagner3, Y. Wang9,3, P. Xie9, S. Yilmaz1, and P. Zieger10,b U. Frieß et al.
  • 1Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
  • 2Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands
  • 3Max Planck Institute for Chemistry, Mainz, Germany
  • 4BIRA-IASB, Brussels, Belgium
  • 5Netherlands Organization for Applied Scientific Research (TNO), Utrecht, the Netherlands
  • 6Center for Environmental Remote Sensing, Chiba University, Chiba, Japan
  • 7Finnish Meteorological Institute (FMI), Helsinki, Finland
  • 8Department of Physics, University of Helsinki, Helsinki, Finland
  • 9Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China
  • 10Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Switzerland
  • anow at: Institute of Astronomy, Leuven University, Leuven, Belgium
  • bnow at: Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden

Abstract. A first direct intercomparison of aerosol vertical profiles from Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations, performed during the Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI) in summer 2009, is presented. Five out of 14 participants of the CINDI campaign reported aerosol extinction profiles and aerosol optical thickness (AOT) as deduced from observations of differential slant column densities of the oxygen collision complex (O4) at different elevation angles. Aerosol extinction vertical profiles and AOT are compared to backscatter profiles from a ceilometer instrument and to sun photometer measurements, respectively. Furthermore, the near-surface aerosol extinction coefficient is compared to in situ measurements of a humidity-controlled nephelometer and dry aerosol absorption measurements. The participants of this intercomparison exercise use different approaches for the retrieval of aerosol information, including the retrieval of the full vertical profile using optimal estimation and a parametrised approach with a prescribed profile shape. Despite these large conceptual differences, and also differences in the wavelength of the observed O4 absorption band, good agreement in terms of the vertical structure of aerosols within the boundary layer is achieved between the aerosol extinction profiles retrieved by the different groups and the backscatter profiles observed by the ceilometer instrument. AOTs from MAX-DOAS and sun photometer show a good correlation (R>0.8), but all participants systematically underestimate the AOT. Substantial differences between the near-surface aerosol extinction from MAX-DOAS and from the humidified nephelometer remain largely unresolved.

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Short summary
This article describes the first direct comparison of aerosol extinction profiles from Multi-Axis DOAS measurements of the oxygen collision complex using five different retrieval algorithms. A comparison of the retrieved profiles with co-located aerosol measurements shows good agreement with respect to profile shape and aerosol optical thickness. This study shows that MAX-DOAS is a simple, versatile and cost-effective method for the measurement of aerosol properties in the lower troposphere.
This article describes the first direct comparison of aerosol extinction profiles from...