Abstract
The Chemistry Transport Model (CTM) REM-Calgrid (RCG) has been applied to investigate the non-linear relationship between emission changes and modelled SIA (=SO4 + NO3 + NH4) concentrations for a high PM10 episode in spring 2009. Emissions were reduced for the model domain only and the model domain including Boundary Conditions. It was found that the effectiveness of emission reductions increases with increasing emission reduction area whereas results were least dependent on the size of emission reduction area for ammonia emission changes.
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Questioner Name: Peter Builtjes
Q: How important is the seasonal pattern of NH3 emissions and do we know that well enough?
A: We do not know the seasonal pattern of NH3 emissions well enough. NH3 emissions and the corresponding seasonal pattern are still very uncertain. This is partly the reason why we performed also sensitivity runs with NH3 emission changes (−60 % to +40 %) and analysed the sensitivity of modelled concentrations and deposition fluxes to these changes (not shown here). However, this study was performed over a period of only 6 weeks during springtime. To investigate changes in the seasonal pattern a longer time period would have to be modelled and analysed.
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Banzhaf, S., Schaap, M., Kruit, R.W., Stern, R., Builtjes, P. (2014). Response of SIA Concentrations Across Germany to Emission Changes During PM10 Episodes in Spring 2009. In: Steyn, D., Builtjes, P., Timmermans, R. (eds) Air Pollution Modeling and its Application XXII. NATO Science for Peace and Security Series C: Environmental Security. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5577-2_92
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DOI: https://doi.org/10.1007/978-94-007-5577-2_92
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