Atmospheric Measurement Techniques Discussions
www.atmos-meas-tech-discuss.net
1867-8610
2
2
2009
10.5194/amtd-2-725-2009
http://www.atmos-meas-tech-discuss.net/2/725/2009/
http://www.atmos-meas-tech-discuss.net/2/725/2009/amtd-2-725-2009.html
http://www.atmos-meas-tech-discuss.net/2/725/2009/amtd-2-725-2009.pdf
725
779
2009-03-09
Determination of aerosol properties from MAX-DOAS observations of the Ring effect
T. Wagner
thomas.wagner@mpch-mainz.mpg.de
T. Deutschmann
U. Platt
Max-Planck-Institute for Chemistry, Mainz, Germany
Institute for Environmental Physics, University of Heidelberg, Germany
The first quantitative comparison of MAX-DOAS observations of the Ring
effect with model simulations is presented. It is performed for a large
variety of viewing geometries (solar zenith angles: 45° to 90°,
elevation angles: 3°, 6°, 10°, 18°, 90°; three different
azimuth angles), which allows a comprehensive test of our capabilities to
measure and simulate the Ring effect. In addition to the Ring effect, also
the observed O<sub>4</sub> absorptions (optical densities) and radiances are
compared with model simulations. In general good agreement is found for all
measured quantities. From several sensitivity studies it is found that for
most measurement situations the aerosol optical depth has usually the
strongest influence on the observed quantities, but also other aerosol
properties like e.g. the vertical distribution have a significant effect.
Typically, the qualitative dependence of the Ring effect on aerosol
properties is very similar to that of the O<sub>4</sub> absorption. This can be
understood, since both quantities depend strongly on the light path length
in the lower atmosphere. However, in specific cases, the observation of the
Ring effect can provide complementary information to that retrieved from the
O<sub>4</sub> observations. This is e.g. possible for measurements at small
relative azimuth angles, from which information on the asymmetry parameter
can be derived. Observations at large solar zenith angle allow the retrieval
of stratospheric aerosol properties, even in cases with very low aerosol
optical depths. In addition, Ring effect observations in zenith direction
are rather sensitive to the aerosol optical depth (in contrast to O<sub>4</sub>
observations), which might allow to retrieve information on aerosol
properties from existing zenith UV data sets prior to the MAX-DOAS era.
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