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| Titel |
Technical Note: Latitude-time variations of atmospheric column-average dry air mole fractions of CO2, CH4 and N2O |
| VerfasserIn |
R. Saito, P. K. Patra, N. Deutscher, D. Wunch, K. Ishijima, V. Sherlock, T. Blumenstock, S. Dohe, D. Griffith, F. Hase, P. Heikkinen, E. Kyrö, R. Macatangay, J. Mendonca, J. Messerschmidt, I. Morino, J. Notholt, M. Rettinger, K. Strong, R. Sussmann, T. Warneke |
| 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 ; 12, no. 16 ; Nr. 12, no. 16 (2012-08-28), S.7767-7777 |
| Datensatznummer |
250011416
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| Publikation (Nr.) |
 copernicus.org/acp-12-7767-2012.pdf |
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| Zusammenfassung |
| We present a comparison of an atmospheric general circulation model
(AGCM)-based chemistry-transport model (ACTM) simulation with total column
measurements of CO2, CH4 and N2O from the Total Carbon Column
Observing Network (TCCON). The model is able to capture observed trends,
seasonal cycles and inter hemispheric gradients at most sampled locations for
all three species. The model-observation agreements are best for CO2,
because the simulation uses fossil fuel inventories and an inverse model
estimate of non-fossil fuel fluxes. The ACTM captures much of the observed
seasonal variability in CO2 and N2O total columns (~81 %
variance, R>0.9 between ACTM and TCCON for 19 out of 22 cases). These
results suggest that the transport processes in troposphere and stratosphere
are well represented in ACTM. Thus the poor correlation between simulated and
observed CH4 total columns, particularly at tropical and extra-tropical
sites, have been attributed to the uncertainties in surface emissions and loss
by hydroxyl radicals. While the upward-looking total column measurements of
CO2 contains surface flux signals at various spatial and temporal scales,
the N2O measurements are strongly affected by the concentration variations
in the upper troposphere and stratosphere. |
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