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| Titel |
Improved simulation of regional CO2 surface concentrations using GEOS-Chem and fluxes from VEGAS |
| VerfasserIn |
Z. H. Chen, J. Zhu, N. Zeng |
| 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 ; 13, no. 15 ; Nr. 13, no. 15 (2013-08-07), S.7607-7618 |
| Datensatznummer |
250085612
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| Publikation (Nr.) |
 copernicus.org/acp-13-7607-2013.pdf |
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| Zusammenfassung |
| CO2 measurements have been combined with simulated CO2
distributions from a transport model in order to produce the optimal
estimates of CO2 surface fluxes in inverse modeling. However, one
persistent problem in using model–observation comparisons for this goal
relates to the issue of compatibility. Observations at a single station
reflect all underlying processes of various scales. These processes usually
cannot be fully resolved by model simulations at the grid points nearest the
station due to lack of spatial or temporal resolution or missing processes in
the model. In this study the stations in one region were grouped based on the
amplitude and phase of the seasonal cycle at each station. The regionally
averaged CO2 at all stations in one region represents the regional CO2
concentration of this region. The regional CO2 concentrations from model
simulations and observations were used to evaluate the regional model
results. The difference of the regional CO2 concentration between
observation and modeled results reflects the uncertainty of the large-scale
flux in the region where the grouped stations are. We compared the regional
CO2 concentrations between model results with biospheric fluxes from the
Carnegie-Ames-Stanford Approach (CASA) and VEgetation-Global-Atmosphere-Soil
(VEGAS) models, and used observations from GLOBALVIEW-CO2 to evaluate
the regional model results. The results show the largest difference of the
regionally averaged values between simulations with fluxes from VEGAS and
observations is less than 5 ppm for North American boreal, North
American temperate, Eurasian boreal, Eurasian temperate and Europe, which is
smaller than the largest difference between CASA simulations and observations
(more than 5 ppm). There is still a large difference between two model results
and observations for the regional CO2 concentration in the North Atlantic,
Indian Ocean, and South Pacific tropics. The regionally averaged CO2
concentrations will be helpful for comparing CO2 concentrations from modeled
results and observations and evaluating regional surface fluxes from
different methods. |
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