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Comparison of box-air-mass-factors and radiances for Multiple-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) geometries calculated from different UV/visible radiative transfer models (Articolo in rivista)
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- Comparison of box-air-mass-factors and radiances for Multiple-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) geometries calculated from different UV/visible radiative transfer models (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
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T. Wagner1,2, J. P. Burrows3, T. Deutschmann1, B. Dix1, C. von Friedeburg4, U. Frieß1, F. Hendrick5, K.-P. Heue1, H. Irie6, H. Iwabuchi6, Y. Kanaya6, J. Keller7, C. A. McLinden8, H. Oetjen3, E. Palazzi9, A. Petritoli9, U. Platt1, O. Postylyakov10, J. Pukite2, A. Richter3, M. van Roozendael5, A. Rozanov3, V. Rozanov3, R. Sinreich1, S. Sanghavi1, and F. Wittrock3 (2007)
Comparison of box-air-mass-factors and radiances for Multiple-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) geometries calculated from different UV/visible radiative transfer models
in Atmospheric chemistry and physics (Print); Copernicus Gesellschaft MBH, Gottingen (Germania)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- T. Wagner1,2, J. P. Burrows3, T. Deutschmann1, B. Dix1, C. von Friedeburg4, U. Frieß1, F. Hendrick5, K.-P. Heue1, H. Irie6, H. Iwabuchi6, Y. Kanaya6, J. Keller7, C. A. McLinden8, H. Oetjen3, E. Palazzi9, A. Petritoli9, U. Platt1, O. Postylyakov10, J. Pukite2, A. Richter3, M. van Roozendael5, A. Rozanov3, V. Rozanov3, R. Sinreich1, S. Sanghavi1, and F. Wittrock3 (literal)
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- 1Institut fu ?r Umweltphysik, University of Heidelberg, Heidelberg, Germany 2Max-Planck-Institute for Chemistry, Mainz, Germany 3Institut fu ?r Umweltphysik, University of Bremen, Bremen, Germany 4Wiley-VCH, Berlin, Germany
5Institut d'Ae ?ronomie Spatiale de Belgique, Brussels, Belgium 6Frontier Research Center for Global Change, Japan Agency for Marine Earth Science and Technology, Yokohama, Japan 7Paul Scherrer Institute, Villigen, Switzerland 8Environment Canada, Toronto, Canada 9Institute of Atmospheric Science and Climate, Bologna, Italy 10Obukhov Institute of Atmospheric Physics, Moscow, Russia (literal)
- Titolo
- Comparison of box-air-mass-factors and radiances for Multiple-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) geometries calculated from different UV/visible radiative transfer models (literal)
- Abstract
- The results of a comparison exercise of radiative
transfer models (RTM) of various international research
groups for Multiple AXis Differential Optical Absorption
Spectroscopy (MAX-DOAS) viewing geometry are
presented. Besides the assessment of the agreement between
the different models, a second focus of the comparison
was the systematic investigation of the sensitivity of the
MAX-DOAS technique under various viewing geometries
and aerosol conditions. In contrast to previous comparison
exercises, box-air-mass-factors (box-AMFs) for different atmospheric
height layers were modelled, which describe the
sensitivity of the measurements as a function of altitude. In
addition, radiances were calculated allowing the identification
of potential errors, which might be overlooked if only
AMFs are compared. Accurate modelling of radiances is also
a prerequisite for the correct interpretation of satellite observations,
for which the received radiance can strongly vary
across the large ground pixels, and might be also important
for the retrieval of aerosol properties as a future application of MAX-DOAS. The comparison exercises included different
wavelengths and atmospheric scenarios (with and without
aerosols). The strong and systematic influence of aerosol
scattering indicates that from MAX-DOAS observations also
information on atmospheric aerosols can be retrieved. During
the various iterations of the exercises, the results from
all models showed a substantial convergence, and the final
data sets agreed for most cases within about 5%. Larger
deviations were found for cases with low atmospheric optical
depth, for which the photon path lengths along the line
of sight of the instrument can become very large. The differences
occurred between models including full spherical
geometry and those using only plane parallel approximation
indicating that the correct treatment of the Earth's sphericity
becomes indispensable. The modelled box-AMFs constitute
an universal data base for the calculation of arbitrary (total)
AMFs by simple convolution with a given trace gas concentration
profile. Together with the modelled radiances and the
specified settings for the various exercises, they can serve as
test cases for future RTM developments. (literal)
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