By Jutta Graf, Hans Schlager, Monika Krautstrunk (auth.), Sven-Erik Gryning, Millán M. Millán (eds.)

The twentieth overseas Technical assembly on pollution Modelling and Its software used to be held in Valencia, Spain, in the course of past due 1993. At this convention, a brand new list of abstracts was once submitted, a brand new checklist of scientists participated, and a brand new list of nations used to be represented. This basically exhibits society's non-stop and becoming curiosity in, in addition to significance of, the complexities linked to the modelling of pollution. The convention addressed the next major matters: built-in nearby modelling, worldwide and long-range delivery, new modelling advancements, unintentional releases, and version verify­ ment and verification. moreover, project-oriented workshops have been geared up as a part of the convention. the various contributing authors and scientists taking lively half within the discussions following the papers, have made this continuing a list of the present prestige within the box of air pollu­ tion modelling. we wish to exhibit our gratitude to their efforts. We additionally desire to expand our gratitude to the sponsors that made this convention attainable. as well as monetary help from NATOjCCMS the convention got contributions from CEAM, the ecu Asso­ ciation for the technology of pollution, Danish middle for Air examine, and Ris0 nationwide Laboratory. a different furnish was once given through NATOjCCMS to facilitate attendance of scientists from crucial and japanese Europe. We additionally desire to exhibit our gratitude to Rosa Salvador and Pilar Zamora of CEAM, who laboriously geared up the convention pre-proceedings, and to Anne N0rregaard and Ulla Riis Christiansen of Ris0 nationwide Laboratory, who seved as convention secretariat.

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J ,,,! / ,,\ (: r'-": ), / / '... ' \/ Fig 6. Trajectories of particles released instantaneously at 06:00 LT of June 15, 1990, 40 m above the ground, at Thriassion Plain. The wind field used are from (a) the two-grid simulation, (b) from the three-grid simulation. Another type of simulation is this where the same or different models are used over nested grids. The simulation over the coarse grid is used in order to provide lateral boundary conditions to the simulation with the finer grid. This type of simulations does not solve either the problem of the representation of disturbances of a limited spectrum which was discussed above or the local disturbances as they are approaching the model boundaries.

1 2100 Figure 6. Evaluation of the CAL-RAMS model using' data from instrumented aircraft. me. Prepared by T. Tesche (Alpine Geophysics). 22 OBSERVED WIND 1900 UTe 16 JULY 1991 WISCONSIN ) ILLINOIS 7/16191 1900 CDT/O UTe 7/16/91 temperature (el 1400 eOT/ 1900 UTe w max u p pb\ hI 1m AGlI Figure 7. Plotted observed surface winds (upper left) at 1900 UTC 16 July 1991 showing the area coverage of the 16 km and 4 km grids (dashed line). CAL-RAMS output for the 4 km grid includes the surface layer wind streamlines, temperature (1°C isopleths), maximum PBL upward vertical motion (5 em/ sec isopleths) and the computed mixing depths (200 m isopleths).

Tesche (Alpine Geophysics). 20 ""' .... 10 0 0 24 12 16 July 1991 48 36 Time 17 July 1991 21 17 Ju ly 1991 1731 17 7 • , . • 6 29 40 30 20 10 VVVAV1\VAvvyvI \ . ·. 1 2100 Figure 6. Evaluation of the CAL-RAMS model using' data from instrumented aircraft. me. Prepared by T. Tesche (Alpine Geophysics). 22 OBSERVED WIND 1900 UTe 16 JULY 1991 WISCONSIN ) ILLINOIS 7/16191 1900 CDT/O UTe 7/16/91 temperature (el 1400 eOT/ 1900 UTe w max u p pb\ hI 1m AGlI Figure 7. Plotted observed surface winds (upper left) at 1900 UTC 16 July 1991 showing the area coverage of the 16 km and 4 km grids (dashed line).

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