Modelling

The regional numerical weather predicton model COSMO was used to simulate certain periods of the RACLETS campaign. The one-moment scheme which described cloud microphysical processes with prognostic variables was replaced by a two-moment scheme which considered a higher number of hydrometeor classes and used prescribed CCN and INP concentrations.

The results of the two-moment scheme were compared to both, the operationally used one-moment scheme and the in-situ cloud microphysical data and precipitation measurements of the campaign. In addition to tuning of parameterizations of cloud microphysical processes, which are important prerequisites for the stabilization of orographic MPCs and therewith orographic precipitation in the model, the influence of anthropogenic aerosol on precipitation was assesd. The simulations were conducted with various CCN and INP concentrations under the same meteorological conditions to represent clean and polluted scenarios.

Additional Info

Field	Value
parent	RACLETS Field Campaign