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| Titel |
A global coupled Eulerian-Lagrangian model and 1 × 1 km CO2 surface flux dataset for high-resolution atmospheric CO2 transport simulations |
| VerfasserIn |
A. Ganshin, T. Oda, M. Saito, S. Maksyutov, V. Valsala, R. J. Andres, R. E. Fisher, D. Lowry, A. Lukyanov, H. Matsueda, E. G. Nisbet, M. Rigby, Y. Sawa, R. Toumi, K. Tsuboi, A. Varlagin, R. Zhuravlev |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 1 ; Nr. 5, no. 1 (2012-02-15), S.231-243 |
| Datensatznummer |
250002302
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| Publikation (Nr.) |
 copernicus.org/gmd-5-231-2012.pdf |
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| Zusammenfassung |
| We designed a method to simulate atmospheric CO2 concentrations at
several continuous observation sites around the globe using surface fluxes
at a very high spatial resolution. The simulations presented in this study
were performed using the Global Eulerian-Lagrangian Coupled Atmospheric
model (GELCA), comprising a Lagrangian particle dispersion model coupled to
a global atmospheric tracer transport model with prescribed global surface
CO2 flux maps at a 1 × 1 km resolution. The surface fluxes used
in the simulations were prepared by assembling the individual components of
terrestrial, oceanic and fossil fuel CO2 fluxes. This experimental
setup (i.e. a transport model running at a medium resolution, coupled to a
high-resolution Lagrangian particle dispersion model together with global
surface fluxes at a very high resolution), which was designed to represent
high-frequency variations in atmospheric CO2 concentration, has not
been reported at a global scale previously. Two sensitivity experiments were
performed: (a) using the global transport model without coupling to the
Lagrangian dispersion model, and (b) using the coupled model with a reduced
resolution of surface fluxes, in order to evaluate the performance of
Eulerian-Lagrangian coupling and the role of high-resolution fluxes in
simulating high-frequency variations in atmospheric CO2 concentrations.
A correlation analysis between observed and simulated atmospheric CO2
concentrations at selected locations revealed that the inclusion of both
Eulerian-Lagrangian coupling and high-resolution fluxes improves the
high-frequency simulations of the model. The results highlight the potential
of a coupled Eulerian-Lagrangian model in simulating high-frequency
atmospheric CO2 concentrations at many locations worldwide. The model
performs well in representing observations of atmospheric CO2
concentrations at high spatial and temporal resolutions, especially for
coastal sites and sites located close to sources of large anthropogenic
emissions. While this study focused on simulations of CO2
concentrations, the model could be used for other atmospheric compounds with
known estimated emissions. |
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