23 research outputs found
Simultaneous measurement of nitrous acid, nitric acid, and nitrogen dioxide by means of a novel multipollutant diffusive sampler in libraries and archives
On the Importance of Reliable Background Concentrations of Ozone for Regional Scale Photochemical Modelling
Ozone throughout the troposphere is subject of significant temporal and spatial variability due to photochemical production in the planetary boundary layer and free troposphere, stratospheric intrusions, convective events and long range transport. However, high resolving observations of ozone in the troposphere are generally rare today. That is of special disadvantage for limited area models, which represent mathematically a differential equation system with an initial and boundary problem. As ozone concentrations usually increase from the earth surface to the stratosphere, a proper choice of the background ozone concentrations is necessary to reproduce or even predict the amount and distribution of ozone in a specific region of interest. In this paper the impact of background concentrations of ozone on regional scale model results is analysed during a summer smog episode over Europe. For this purpose ozone is artificially partitioned into individual categories. For each category, transport and chemical transformation is calculated separately. Initial and boundary concentrations of ozone dominate total ozone concentrations increasingly with height. But also in the planetary boundary layer they contribute with more than 30% to the total ozone changes and are therefore far from being negligible. Moderately modified assumptions of background ozone concentrations reveal an uncertainty of near surface ozone concentrations of 5-15% depending on the weather situation
Studying the City Plume of Berlin on 20 July 1998 with Three Different Modelling Approaches
Indonesian peat and vegetation fire emissions: Study on factors influencing large-scale smoke haze pollution using a regional atmospheric chemistry model
Air pollution, El Niño, Regional atmospheric chemistry model, Smoke dispersion, Southeast Asia, Vegetation and peat fires,
Analysis of Model Results for the Turning of the Wind and Related Momentum Fluxes in the Stable Boundary Layer
Parameterization of vertical dispersion coefficient over idealized rough surfaces in isothermal conditions
Comparison of Five Eulerian Air Pollution Forecasting Systems for the Summer of 1999 Using the German Ozone Monitoring Data
Chemical perturbations in the planetary boundary layer and their relevance for chemistry transport modelling
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