Episode selection for ozone modelling and control strategies analysis on the Swiss Plateau

An episode selection procedure was developed and applied to select sets of days representing characteristic meteorol. conditions leading to high ozone episodes over the Swiss Plateau. The selection procedure was applied to data extending from Jan. 1991 through Dec. 1998, and is comprised of two steps: First, days were classified according to obsd. air quality and meteorol. characteristics using classification and regression trees anal. (CART). Second, the CART results were used in conjunction with obsd. air quality data to identify sets of days characteristic of those leading to elevated ozone. These sets of days were selected to optimize how well a limited no. of days represented seasonal air quality, and that formed longer episodes for use in the air quality modeling. CART anal. was performed for three zones of the Swiss Plateau that have different air quality and meteorol. characteristics. The results for two zones were used together in the episode selection procedure in order to identify days representative for the whole Plateau. Meteorol. anal. for a third zone suggested that it would be strongly impacted by pollutants transported in from outside the country. One thousand and eight hundred optimization runs were performed to minimize the likelihood that the set of days was a local optimum, increasing the robustness for use in air quality modeling anal. Fifteen days, grouped in four episodes ranging from 3 to 5 days were selected along with their calcd. representativeness (or wt.) to recreate a seasonal metric. The variety of local as well as regional meteorol. characteristics showed that the episode selection procedure chose days representing a diverse set of meteorol. situations which are assocd. with elevated ozone. This set of episodes can now be used to test air quality strategies.

Published in:
Atmospheric Environment, 36, 17, 2817–2830
Copyright 2003 ACS
AN 2002:421466
CAN 137:251784
Air Pollution and Industrial Hygiene
Swiss Federal Institute of Technology, EPFL, DGR-LPAS,Lausanne,Switz. FIELD URL:
written in English.
Environmental modeling; Environmental transport; Optimization; Regression analysis; Simulation and Modeling (episode selection for ozone modeling and control strategies anal. on Swiss Plateau); Environmental pollution (ozone; episode selection for ozone modeling and control strategies anal. on Swiss Plateau)
Boylan, J; Proceedings of the 94th Annual A&WMA Conference 2001|Brieman, L; Classification and Regression Trees 1984|Brook, J; Journal of Applied Meteorology 1995, 34, 297|Brook, J; Journal of Applied Meteorology 1995, 34, 326|Cohn, R; Journal of Applied Meteorology 2001, 40, 210|Eder, B; Journal of Applied Meteorology 1994, 33, 1182|Eidgenossische Komission fur Lufthygiene; Ozone in der Schweiz 1993|NAPAP National Acid Precipitation Assessment Program; National Acid Precipitation Assessment Program 1990 Integrated Assessment Report 1991|SAEFL; L'ozone tropospherique. Resultats des recherches actuelles. Consequences pour la lutte contre la pollution de l'air 1996|System Application International Inc; Episode selection for the integrated analysis of ozone, visibility, and acid deposition for the Southern Appalachian Mountain 1998|US EPA; Draft Guidance on the Use of Models and Other Analyses in Attainment Demonstrations for the 8-Hour NAAQS 1999|Venables, W; Modern Applied Statistics with S-PLUS 1998

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