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Atmospheric Chemistry and Physics An Interactive Open Access Journal of the European Geosciences Union

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Atmos. Chem. Phys., 10, 3205-3213, 2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Technical Note: A new coupled system for global-to-regional downscaling of CO2 concentration estimation
K. Trusilova, C. Rödenbeck, C. Gerbig, and M. Heimann
Max-Planck Institute for Biogeochemistry, Hans-Knoell Str. 10, Jena, Germany

Abstract. We introduce a global-to-regional nesting scheme for atmospheric transport models used in simulating concentrations of green house gases from globally distributed surface fluxes. The coupled system of the regional Stochastic Time-Inverted Lagrangian Transport (STILT) model and the global atmospheric transport model (TM3) is designed to resolve atmospheric trace gas concentrations at high temporal and spatial resolutions in a specified domain e.g. for regional inverse applications. The nesting technique used for the coupling is based on a decomposition of the atmospheric concentration signal into a far-field and a near-field contribution enabling the usage of different model types for global (Eulerian) and regional (Lagrangian) scales. For illustrating the performance of the coupled TM3-STILT system we compare simulated mixing ratios of carbon dioxide with available observations at 10 sites in Europe. For all chosen sites the TM3-STILT provided higher correlations between the modelled and the measured time series than the TM3 global model. Autocorrelation analysis demonstrated that the TM3-STILT model captured temporal variability of measured tracer concentrations better than TM3 at most sites.

Citation: Trusilova, K., Rödenbeck, C., Gerbig, C., and Heimann, M.: Technical Note: A new coupled system for global-to-regional downscaling of CO2 concentration estimation, Atmos. Chem. Phys., 10, 3205-3213, doi:10.5194/acp-10-3205-2010, 2010.
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