Evaluation of a new convective cloud field model: precipitation over the maritime continent H.-F. Graf and J. Yang University of Cambridge, Centre for Atmospheric Sciences, Cambridge, UK
Abstract. A convective cloud field model (CCFM) is substituted for a standard mass
flux parameterisation of convective clouds in a limited area atmospheric
model (REMO) and is tested for a whole annual cycle (July 1997 to June 1998)
over the West Pacific Maritime Continent. REMO with CCFM is run in 0.5-degree resolution
and the model at the lateral boundaries is forced 6-hourly by ECMWF reanalysis data.
Simulated precipitation from runs with the standard convection
parameterisation and with CCFM is compared against two sets of observations.
The use of CCFM clearly improves the simulated precipitation patterns and
total rainfall over the whole model domain. The distribution between
large-scale and convective precipitation becomes more realistic. CCFM shows
to be a useful concept to describe convective cloud spectra in atmospheric
models, although there are still similar problems with occasionally extreme
precipitation as in the original set-up of REMO.
Citation: Graf, H.-F. and Yang, J.: Evaluation of a new convective cloud field model: precipitation over the maritime continent, Atmos. Chem. Phys., 7, 409-421, doi:10.5194/acp-7-409-2007, 2007.