TRANSPORT SENSITIVITY ANALYSIS ON OZONE CONCENTRATIONS IN IBERIAN PENINSULA BY USING MM5-CMAQ MODELLING SYSTEM

摘要

In the last decades the interest for investigating the ozone concentrations in the atmosphere in the tropospheric layer has increased extraordinary. The ozone species is recognized as one of the most important oxidants in the atmosphere and also as a toxic pollutant since the health consequences in human beings when high concentrations are present are important. It is also a greenhouse gas so that important climatic consequences are also derived from those high concentrations. Tropospheric ozone is formed by the chemical reactions in the atmosphere when NOx and VOC's are present and activated depending the pressure, temperature and solar radiation. Vehicle traffic in urban and rural areas is important. In Spain more than 25000000 and in the Iberian Peninsula is more than 32000000. The local impact of the NOx and VOC's emissions on ozone production are being investigated intensively in the last decades. Little attention has been put on larger domains and the possible impact of the total ozone tropospheric budget. This contribution shows the impact on ozone total budgets of traffic emissions over the Iberian Peninsula. Results show that for the first day of simulation an increase up to 25% of ozone is found and for the rest of the days of simulation increase values ranging between 2 - 5% are found. Although the 25% increase cannot be neglected as a whole the impact over the total tropospheric ozone budget is limited. Additional experiments over several more different periods over the year are necessary for more conclusive results.