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STUDY OF THE ATMOSPHERIC CONDITIONS DURING AIR-POLLUTION EPISODES IN THE GREATER ATHENS AREA

By ΠΑΥΛΟΣ ΚΑΣΣΩΜΕΝΟΣ

Abstract

IN THIS WORK AN ATTEMPT WAS MADE IN ORDER TO STUDY IN A SYSTEMATIC WAY THE PREVAILING METEROLOGICAL CONDITIONS DURING AIR POLLUTION EPISODES IN THE ATHENS BASIN. FROM THE ANALYSIS OF THE EXISTING AIR QUALITY MEASUREMENTS THE 80 WORST AIR POLLUTION EPISODES WERE SELECTED AND THE SYNOPTIC CONDITIONS WHICH AFFECT AIR POLLUTION IN ATHENS WERE STUDIED. A NUMBER OF QUANTITIES WHICH ARE RELATED WITH AIR QUALITY IN THE ATHENS BASIN WERE CALCULATED AND COMPARED WITH ITS PREVAILING CLIMATIC VALUES IN THE AREA. IT WAS FOUND THAT THE LARGEST NUMBER OFAIR POLLUTION EPISODES IS RELATED WITH WARM ADVECTION IN THE LOWER TROPOSPHEREAND/OR WEAK PRESSURE GRADIENT OVER THE AEGEAN SEA. BASED ON THE RESULTS OF THE ABOVE CLIMATIC ANALYSIS, SEVERAL SIMULATIONS OF THE ATMOSPHERIC CIRCULATION DISPERSION-DIFFUSION AND CHEMICAL TRANSFORMATION WITH THE CSU-RAMS, LPDM, CALGRID MODELS WERE RESPECTIVELY MADE. WITH THE HELP OF THE ABOVE SIMULATIONS THE INTERACTION OF REGIONAL AND MESOSCALE ATMOSPHERIC CIRCULATIONS WAS SATISFACTORILY DESCRIBED. THESE CIRCULATIONS FORM THE FLOW FIELD AND THE DISPERSION-DIFFUSION CONDITIONS IN THE AREA. DURING THE COLD PERIOD OF THE YEAR THE WIND CONDITIONS IN THE ATHENS BASIN WERE DETERMINED FROM CIRCULATIONS OF REGIONAL SCALE IN SPITE OF LOCAL THERMAL CONDITIONS. THE PHENOMENA OF TRANSPORTATION ANDRECIRCULATION OF AIR POLLUTANTS RELEASED FROM VARIOUS SOURCES LOCATED IN THE GREATER ATHENS AREA WERE STUDIED TOO. SOME OF THE CHARACTERISTICS OF PHOTOCHEMICAL "CLOUD" OF ATHENS WERE ALSO REVEALED.

Topics: Air pollution, AIR POLLUTION CLIMATOLOGY, AIR POLLUTION IN THE ATHENS BASIN, ATMOSPHERIC DYNAMICS, MODELLING OF THE ATMOSPHERIC CIRCULATION (MESO AND LARGE SCALE), MODELLING OF THE DISPERSION OF AIR POLLUTANTS, ΔΥΝΑΜΙΚΗ ΤΗΣ ΑΤΜΟΣΦΑΙΡΑΣ, ΚΛΙΜΑΤΟΛΟΓΙΑ ΤΗΣ ΑΕΡΙΑΣ ΡΥΠΑΝΣΗΣ, ΜΟΝΤΕΛΟΠΟΙΗΣΗ ΤΗΣ ΑΤΜΟΣΦΑΙΡΙΚΗΣ ΚΥΚΛΟΦΟΡΙΑΣ, ΜΟΝΤΕΛΟΠΟΙΗΣΗ ΤΗΣ ΔΙΑΧΥΣΗΣ ΑΕΡΙΩΝ ΡΥΠΩΝ, ΡΥΠΑΝΣΗ ΤΗΣ ΑΤΜΟΣΦΑΙΡΑΣ (ΔΙΑΧΥΣΗ) ΣΤΟ ΛΕΚΑΝΟΠΕΔΙΟ ΤΗΣ ΑΤΤΙΚΗΣ, Φυσική της ατμόσφαιρας, ΦΥΣΙΚΗ ΤΟΥ ΑΤΜΟΣΦΑΙΡΙΚΟΥ ΠΕΡΙΒΑΛΛΟΝΤΟΣ
Publisher: National and Kapodistrian University of Athens
Year: 1993
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