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| Titel |
MAX-DOAS measurements of atmospheric trace gases in Ny-Ålesund - Radiative transfer studies and their application |
| VerfasserIn |
F. Wittrock, H. Oetjen, A. Richter, S. Fietkau, T. Medeke, A. Rozanov, J. P. Burrows |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 4, no. 4 ; Nr. 4, no. 4 (2004-06-28), S.955-966 |
| Datensatznummer |
250001832
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| Publikation (Nr.) |
 copernicus.org/acp-4-955-2004.pdf |
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| Zusammenfassung |
| A new approach to derive tropospheric concentrations of some
atmospheric trace gases from ground-based UV/vis measurements is
described. The instrument, referred to as the MAX-DOAS, is based
on the well-known UV/vis instruments, which use the sunlight
scattered in the zenith sky as the light source and the method of
Differential Optical Absorption Spectroscopy (DOAS) to derive
column amounts of absorbers like ozone and nitrogen dioxide.
Substantial enhancements have been applied to this standard setup
to use different lines of sight near to the horizon as additional
light sources (MAX - multi axis). Results from measurements at
Ny-Ålesund (79° N, 12° E) are presented and
interpreted with the full-spherical radiative transfer model
SCIATRAN. In particular, measurements of the oxygen dimer
O4 which has a known column and vertical distribution in
the atmosphere are used to evaluate the sensitivity of the
retrieval to parameters such as multiple scattering, solar
azimuth, surface albedo and refraction in the atmosphere and also
to validate the radiative transfer model. As a first application,
measurements of NO2 emissions from a ship lying in Ny-Ålesund
harbour are presented. The results of this study
demonstrate the feasibility of long term UV/vis multi axis
measurement that can be used to derive not only column amounts of
different trace gases but also some information on the vertical
location of these absorbers. |
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