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EURASAP WORKSHOP ON METEOROLOGICAL PRE-PROCESSING FOR COMPLEX TERRAIN -UPSCALING

June 12-14, 2000, Prague, Czech Republic

Joseph Brechler, Prague, Czech Republic

In many studies including air-pollution transport phenomena modelling, atmospheric planetary boundary layer processes investigation and modelling or urban scale processes modelling, for example, the impact of complex orography on these processes has to be taken into account. In the EURASAP Workshop "Meteorological Pre-Processing for Complex Terrain - Upscaling", which took place in Prague, from 12 to 14 June 2000, this topic has been discussed from several point of views and also from different spatial scales. Presented papers cover the broad spectrum of problems; there were presented papers dealing with numerical meteorological models and air-pollution models on urban scale and mesoscale together with those dealing with modelling of fluxes on different spatial scales or with methods for deriving the comprehensive micrometeorological dataset for North American cities together with presentations describing interpolation techniques.

A fine scale MM5 meteorological model nested in HIRLAM NWP-model creates an operationally used system for generating meteorological data needed in air-pollution forecasting system for Oslo and its surroundings. Information about this forecasting system together with some results was given in a presentation by E. Berge and A. Sorteberg called An Operational Fine Scale NWP-Model for the Complex Terrain of Oslo, Norway. An Australian approach to a similar problem was a subject of a contribution Meteorology for Air-Pollution Modelling in Complex Terrain by P.C. Manins and P.J. Hurley. Application of meteorological model to urban scale problems and a description of prepared project FUME (5. FP of EC) was given by A. Rasmussen and A. Baklanov from Denmark in a paper Forecasting Urban Meteorology - Possibilities of NWP-Models. Results of modelling activities carried out by NILU in the framework of the international project called Program Teplice was a subject of a presentation called Source Oriented Model Calculation for a Central European Airshed by K.E. Gronskei et al. The Austrian approach to modelling the ozone episodes in the city of Vienna and its greater surroundings described K. Baumann et al. in a paper TAMOS Meteorological Analyses and Boundary Layer Parameters - Applied for Ozone Simulations in the Greater Surroundings of Vienna. Results of air pollution case study in the complex orography in Peru (ILO experiment) was presented by E. Georgieva and E. Canepa in The Meteorological Pre-Processing for the SAFE_AIR code: Application for ILO (Peru) Experiment. Modelling of processes within a cooling tower plume and verification of the results was presented by Z. Sokol and D. Rezacova in a paper called Cooling Tower Plume Model, Verification with Measurement. A contribution of C.S.B. Grimmond and T.R. Oke called A Comprehensive Micrometeorological Dataset Derived for North American Cities dealt with results from series of micro-meteorological measurement campaigns that occurred in seven North American cities and consequences derived for vertical fluxes. Vertical momentum and heat fluxes above the area covered with forest was the subject of the paper Modelling the Local and Regional Fluxes over a Nordic Forest by E. Batchvarova et al. Interpolation procedures and their application to spatial distribution of meteorological data were subjects of the following two papers. The former presented by H. Scheifinger was called A Statistical Interpolation Scheme to Generate 2D and 3D Input Fields of Basic Meteorological Variables for Pre-Processors from Routine Meteorological Data in Complex Terrain the latter called Problem of Spatial Interpolation by J. Brechler.

The broad spectrum of topics presented in the workshop showed that the problem of irregular topography, inhomogeneous and complex structure of some type of surfaces (urban areas, forest areas especially covered with snow) is still not well treated and is a matter of interest of different studies. Measurements carried out in various field experiments dealing with vertical fluxes above the above mentioned kinds of surfaces have to be processed in order that they can be used in meteorological models as the structure of planetary boundary layer and it thickness is highly affected with these fluxes, for example. The method how to obtain desired information about heat fluxes in urban areas based on description of surface properties and information gained from ground based measurement has been mentioned.

The Workshop finished on Wednesday June 14, 2000 and it was followed with a one day COST 715 Workshop on "Preparation of Meteorological Input Data for Urban Site Studies".

       
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