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| Titel |
Ethane, ethyne and carbon monoxide concentrations in the upper troposphere and lower stratosphere from ACE and GEOS-Chem: a comparison study |
| VerfasserIn |
G. González Abad, N. D. C. Allen, P. F. Bernath, C. D. Boone, S. D. McLeod, G. L. Manney, G. C. Toon, C. Carouge, Y. Wang, S. Wu, M. P. Barkley, P. I. Palmer, Y. Xiao, T. M. Fu |
| 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 ; 11, no. 18 ; Nr. 11, no. 18 (2011-09-27), S.9927-9941 |
| Datensatznummer |
250010104
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| Publikation (Nr.) |
 copernicus.org/acp-11-9927-2011.pdf |
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| Zusammenfassung |
| Near global upper tropospheric concentrations of carbon monoxide (CO),
ethane (C2H6) and ethyne (C2H2) from ACE (Atmospheric
Chemistry Experiment) Fourier transform spectrometer on board the Canadian
satellite SCISAT-1 are presented and compared with the output from the
Chemical Transport Model (CTM) GEOS-Chem. The retrievals of ethane and
ethyne from ACE have been improved for this paper by using new sets of
microwindows compared with those for previous versions of ACE data. With the
improved ethyne retrieval we have been able to produce a near global upper
tropospheric distribution of C2H2 from space. Carbon monoxide,
ethane and ethyne concentrations retrieved using ACE spectra show the
expected seasonality linked to variations in the anthropogenic emissions and
destruction rates as well as seasonal biomass burning activity. The
GEOS-Chem model was run using the dicarbonyl chemistry suite, an extended
chemical mechanism in which ethyne is treated explicitly. Seasonal cycles
observed from satellite data are well reproduced by the model output,
however the simulated CO concentrations are found to be systematically
biased low over the Northern Hemisphere. An average negative global mean
bias of 12% and 7% of the model relative to the satellite observations
has been found for CO and C2H6 respectively and a positive global
mean bias of 1% has been found for C2H2. ACE data are compared
for validation purposes with MkIV spectrometer data and Global Tropospheric
Experiment (GTE) TRACE-A campaign data showing good agreement with all of
them. |
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