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| Titel |
Profile information on CO from SCIAMACHY observations using cloud slicing and comparison with model simulations |
| VerfasserIn |
C. Liu, S. Beirle, T. Butler, P. Hoor, C. Frankenberg, P. Jöckel, M. Penning de Vries, U. Platt, A. Pozzer, M. G. Lawrence, J. Lelieveld  , H. Tost, T. Wagner |
| 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 ; 14, no. 3 ; Nr. 14, no. 3 (2014-02-14), S.1717-1732 |
| Datensatznummer |
250118378
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| Publikation (Nr.) |
 copernicus.org/acp-14-1717-2014.pdf |
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| Zusammenfassung |
| We apply a cloud slicing technique (CST), originally developed for
Total Ozone Mapping Spectrometer (TOMS) ozone observations, to CO vertical
column densities retrieved from the SCanning Imaging Absorption spectroMeter
for Atmospheric CHartographY (SCIAMACHY). CST makes use of the shielding
effect of clouds and combines trace gas column measurements of cloudy pixels
with different cloud heights to retrieve fractional columns aloft. Here we
determine seasonal mean tropospheric CO profiles at a vertical resolution of
about 1 km, which is much finer than what can be obtained from thermal
infrared (IR) instruments. However, since both the atmospheric CO profiles
and the effective cloud heights depend systematically on meteorology, and in
addition part of the retrieved signal originates from the clear part of the
satellite ground pixel, the profiles retrieved from the CST have to be
interpreted with care. We compare the seasonal mean SCIAMACHY CO profiles
with the output from two atmospheric models sampled in the same way as the
satellite observations. We find in general good agreement of the spatial
patterns, but systematic differences in the absolute values are observed in
both hemispheres (more strongly in the Northern Hemisphere), indicating that
the source strengths in the emission inventories are probably
underestimated. |
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