Extended Abstract (100K)12.5a
Evaluation of the micrometeorology in a single column chemistry and meteorological model being constrained with the ECMWF analyzed meteorology (Paper formerly number P4.20)
Laurens Ganzeveld, Max-Planck Institute for Chemistry, Mainz, Germany; and J. Valverde-Canossa and G. Moortgat
A multi-layer atmosphere-biosphere trace gas model has been developed and evaluated using a Single Column Model (SCM) version of the global chemistry and climate model ECHAM. Use of the SCM is motivated by the fact that it offers the opportunity to perform detailed process studies and to develop parameterizations with an optimal consistency for application in ECHAM. A disadvantage of using an SCM is that it does not include the contribution by advection of air masses with different properties, such as the passage of a cold front. Consequently, model integrations basically reflect the climatological conditions. A prerequisite for a fair evaluation of the simulated trace gas exchanges is a realistic representation of the micrometeorology since many of the processes involved, e.g., dry deposition, turbulent mixing and photo-dissociation are controlled by parameters like radiation, temperature and wind speed. The SCM will be applied to compare the simulated and observed fluxes and concentrations of peroxides over a deciduous forest in southeastern Germany and to study some of the processes involved, e.g., dry deposition and chemical transformations. In this study we show the comparison between the simulated and observed micrometeorology for a 25-day period in July-August 2001 for the measurement site, constraining the SCM with the ECMWF analyzed meteorology.
Session 12, Coupled Surface-BL studies
Thursday, 18 July 2002, 10:30 AM-12:30 PM
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