An Experiment with an Advanced Surface Parameterization in a Mesobeta-Scale Model. Part II: The 16 June 1986 Simulation

Abstract

In this second part, we report on a one-day simulation with the French Weather Service limited-area model PERIDOT, including the new parameterization of land-surface energy budget. The emphasis is put on the assessment of the general quality of the simulation at mesobeta scale, in order to establish the significance of the detailed comparisons with the HAPEX-MOBILHY dataset, presented in Part III. We examine the evolution of surface wind, temperature, and humidity, of the low-level clouds, of surface budget characteristics, of the planetary boundary layer structure and horizontal variability, and of induced mesoscale circulations. Whenever it is possible, we present both model and observed parameters and discuss remaining discrepancies. We conclude that the model has captured most of the phenomena occurring at mesoscale-scale on this particular day, and that the reference integration constitutes a good numerical laboratory to investigate the problems posed by the surface parameterization at scales ranging from 10 to 100 km.