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

The twentieth foreign Technical assembly on pollution Modelling and Its software was once held in Valencia, Spain, in the course of overdue 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 essentially shows society's non-stop and becoming curiosity in, in addition to value of, the complexities linked to the modelling of pollution. The convention addressed the subsequent major matters: built-in local modelling, worldwide and long-range delivery, new modelling advancements, unintentional releases, and version examine­ 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 checklist 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 aid from NATOjCCMS the convention bought contributions from CEAM, the ecu Asso­ ciation for the technology of pollution, Danish middle for Air learn, and Ris0 nationwide Laboratory. a different supply was once given via NATOjCCMS to facilitate attendance of scientists from vital and japanese Europe. We additionally desire to show our gratitude to Rosa Salvador and Pilar Zamora of CEAM, who laboriously equipped 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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003? AVERAGE GROSS ERROR: . 31 FRACTIONAL BIAS : - • 06 INDEX OF AGREEMENT: . 79 HISTOGRAM (PREDICTED-OBSERVATION) -14 0 -13 0 -12 0 -11 0 - 10 -9 -8 -7 -6 0 1 1 1 6- -5 -4 -3 4· 20***"'''· 49*******··**- -2 98········**········*****· -1 145····**····***···· .. ····*************· o 180············ . ·***··············**·**·····**·· 1 100···········**··**········ 2 49*·*·*·~···*· 3 28······· 4 5 6 7 8 9 10 Figure 3. Tool for evaluating the CAL-RAMS 32 km grid output by ploUing the predicted minus observed differences at hourly surface weather reporting stations.

60, -80. - 60 . - 40 . -20, 0, X 20 . 40 . 60, 80, (km) Grid 3 50,~--~------------------~r--r-. 40 , 30 20. E -'" - 30 . - 2 0 . - 10 . 0, 10, 20. X (km) 30 . 40 . 50 Fig. 5 The same as in Fig. 4 but for the three model grids (three-grid simulation) 41 Under revision is also the idea of having sea-breeze developed over the Athens Basin even during the winter months. An example of the differences in dispersion calculations due to the selected model domain is given in Fig. 6 where a well documented mechanism is described.

60. 40, 2 0. - >- 20. ' 60, -80. - 60 . - 40 . -20, 0, X 20 . 40 . 60, 80, (km) Grid 3 50,~--~------------------~r--r-. 40 , 30 20. E -'" - 30 . - 2 0 . - 10 . 0, 10, 20. X (km) 30 . 40 . 50 Fig. 5 The same as in Fig. 4 but for the three model grids (three-grid simulation) 41 Under revision is also the idea of having sea-breeze developed over the Athens Basin even during the winter months. An example of the differences in dispersion calculations due to the selected model domain is given in Fig.

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