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| Titel |
Retrieval of stratospheric aerosol density profiles from SCIAMACHY limb radiance measurements in the O2 A-band |
| VerfasserIn |
B. Ovigneur, J. Landgraf, R. Snel, I. Aben |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 11 ; Nr. 4, no. 11 (2011-11-02), S.2359-2373 |
| Datensatznummer |
250002129
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| Publikation (Nr.) |
 copernicus.org/amt-4-2359-2011.pdf |
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| Zusammenfassung |
| In this paper we present an approach to retrieve stratospheric aerosol
number densities in the altitude range 10–40 km from SCIAMACHY limb
radiance measurements in the spectral range of the O2 A
absorption band, near 760 nm. Here, the characteristic light paths
differ for the measured light in the O2 A-band and in the
spectral continuum next to the absorption band. This difference is
used to distinguish the effect of stratospheric aerosol scattering and
ground reflection on the limb measurement. The capability to
disentangle both effects is illustrated for SCIAMACHY limb
observations over the Libyan desert, where the measurements are not
affected by tropospheric clouds. Comparison of the SCIAMACHY retrieval
and the SAGE II aerosol extinction product between 75° southern
and northern latitude shows the clear need for prior knowledge of the
mean size of the stratospheric aerosol for the SCIAMACHY retrieval. We
found best agreement between SCIAMACHY and SAGE II aerosol extinction
for the period 2003–2005 for a prior choice of the mean aerosol size
radius of 0.2 μm. The overall agreement between both data sets
is in the range <50% root mean square difference at 14–30 km with
a minimum of 30% at 22 km. |
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