Analysis of a summer smog episode in the Berlin-Brandenburg region with a nested atmosphere -- chemistry model

[摘要] An analysis of a pollution episode in an urbanatmosphere, using a complex model system is presented. The nested atmosphere-chemistry model system simulates the atmosphericconditions during a one week measurement campaign, called FLUMOB, in July 1994in Berlin-Brandenburg, Germany. The analysis shows that naturally emitted hydrocarbons played the dominant role in the ozone formationin the investigated area. The composition of non-methane volatile organic compounds was made upto 70--80% by biogenically emitted hydrocarbons. During the analysed case, ozone formation was sensitive tohydrocarbon concentrations so that the ozone production was limited by the availability of hydrocarbonsand thus especially by the amount which was biogenically emitted. Furthermore, it is shown that the FLUMOB episode wasinfluenced byelevated concentrations of ozone in the free troposphere. In contrast to previous analyses, the importance of ozone produced outside ofEurope is emphasized. In spite of the stagnant high pressure situation which occurredduring the FLUMOB episode Germany was significantly influenced by long-range transport of ozone. This transport also influenced near surface ozone concentrations.

[学科分类] 大气科学