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| Titel |
Glyoxal vertical columns from GOME-2 backscattered light measurements and comparisons with a global model |
| VerfasserIn |
C. Lerot, T. Stavrakou, I. Smedt, J.-F. Müller, M. Roozendael |
| 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 ; 10, no. 24 ; Nr. 10, no. 24 (2010-12-17), S.12059-12072 |
| Datensatznummer |
250008969
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| Publikation (Nr.) |
 copernicus.org/acp-10-12059-2010.pdf |
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| Zusammenfassung |
| Glyoxal vertical column densities have been retrieved from nadir
backscattered radiances measured from 2007 to 2009 by the spaceborne
GOME-2/METOP-A sensor. The retrieval algorithm is based on the DOAS technique
and optimized settings have been used to determine glyoxal slant columns. The
liquid water absorption is accounted for using a two-step DOAS approach,
leading to a drastic improvement of the fit quality over remote clear water
oceans. Air mass factors are calculated by means of look-up tables of
weighting functions pre-calculated with the LIDORT v3.3 radiative transfer
model and using a priori glyoxal vertical distributions provided by the
IMAGESv2 chemical transport model. The total error estimate comprises random
and systematic errors associated to the DOAS fit, the air mass factor
calculation and the cloud correction. The highest glyoxal vertical column
densities are mainly observed in continental tropical regions, while the
mid-latitude columns strongly depend on the season with maximum values during
warm months. An anthropogenic signature is also observed in highly populated
regions of Asia. Comparisons with glyoxal columns simulated with IMAGESv2 in
different regions of the world generally point to a missing glyoxal source,
most probably of biogenic origin. |
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