Dacic, Milan (Institute of Physics, Belgrade)
As a part of the action in developing a regional climate model for Mediterranean region based on the ETA UB/NCEP (University of Belgrade, National Center for Environmental Prediction - Washington), this paper presents preliminary results of a model validation phase. The main goal of this phase is to identify the model biases and uncertainties duw solely to the internal model physics.
We have performed a continous ETA model simulation in duration of one month, driven by the analysis of observations which provide a single initial field and lateral boubdary conditions updated regularly on a 12-hour interval.
Geopotential height maps show reasonable agreement with observations. Evolution maps of normalized mass, kinetic and potential energy suggests that there is no systematic growth or loss of mass and energy. The monthly mean geopotential height bias is positive in the layer between 700 and 150 mb and negative elsewhere. On the whole it does not exceed 30 mgp. The negative bias in 1000 mb geopotential heights is possibly due to different algorithms to calculate these heights in the model and analysis procedures.
The results of simulations performed using different domain size reveal greater importance of internal model physics in the interior of the domain away from the boundaries and suggest further experimentation with the model set-up.