intercomparison of aerosol extinction profiles retrieved from max-doas measurements
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2016
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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.
| Reference Key |
frie2016atmosphericintercomparison
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|---|---|
| Authors | ;U. Frieß;H. Klein Baltink;S. Beirle;K. Clémer;F. Hendrick;B. Henzing;H. Irie;G. de Leeuw;A. Li;M. M. Moerman;M. van Roozendael;R. Shaiganfar;T. Wagner;Y. Wang;P. Xie;S. Yilmaz;P. Zieger |
| Journal | bioorganic & medicinal chemistry |
| Year | 2016 |
| DOI |
10.5194/amt-9-3205-2016
|
| URL | |
| Keywords |
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