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| Titel |
Comparison of TCCON and ACTM atmospheric CO2, CH4 and N2O column averages |
| VerfasserIn |
R. Saito |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064621
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| Zusammenfassung |
| We present a comparison of the CCSR/NIES/FRCGC 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 captures observed trends, seasonal cycles and interhemispheric
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. These results suggest that the transport processes
in troposphere and stratosphere are well represented in ACTM. Some of the poor correlation
between simulated and observed CH4 columns, particularly at tropical and extratropical sites,
have been attributed to the uncertainties in surface emissions and loss by hydroxyl radicals.
While the upward-looking 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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