Model evaluation with respect to deposition processes
conference paper
The Chemistry Transport Model REM-Calgrid (RCG) has been used to simulate air pollution concentrations and depositions. The fluxes have been evaluated using dry deposition measurements from Augustendorf and wet deposition fluxes from UBA over Germany. Meteorological input fields were provided by COSMO-EU of the German Weather Service (DWD). COSMO-EU friction velocities have been compared to turbulence measurements at the Lindenberg site. Simulated cloud liquid water content has been evaluated using Cloudnet data. Since UBA wet deposition measurement stations also provide precipitation amounts modelled precipitation has been compared to these independent observations. Friction velocities are simulated well with correlation coefficients over 0.8 and reproducing correctly the landscape. Resultant dry deposition fluxes over a forest site were reasonable for most nitrogen species. COSMO-EU precipitation is in sound agreement with most UBA stations. Simulated cloud liquid water content underestimates Cloudnet measurements. Modelled NHx wet depositions are less affected by this underestimation than SOx and NOy wet depositions since NHx is less mixed up. Hence, RCG NHx wet depositions compare very well to UBA observations while SOx and NOy wet depositions are underestimated.
Topics
Atmospheric dispersionsModel evaluationPollutants depositionAtmospheric chemistryAtmospheric movementsFrictionPollutionAtmospheric dispersionChemistry transport modelCorrelation coefficientDry deposition fluxesMeteorological inputModel evaluationPollution concentrationTurbulence measurementsDeposition
TNO Identifier
527036
ISBN
9782868150622
Publisher
ARIA Technologies
Source title
HARMO 2010 - Proceedings of the 13th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes
Editor(s)
Albergel A.
Pages
185-189
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