|
|
Climate change or precursor emissions - which of these will be the major player in future ground-level ozone concentrations?
Tremaskina, Anastasiia ; Hůnová, Iva (advisor) ; Matoušková, Leona (referee)
This thesis examines the reasons for potential future outcomes as well as the evolution of future ground-level O3 concentrations. Ground-level O3 is primarily formed by the reaction of precursor emissions, such as nitrogen oxides (NOx) and volatile organic compounds (VOCs), in the presence of solar radiation and warm temperatures. Transport, industrial operations, and energy production are the primary human activities that produce these emissions. Climate change, on the other hand, also has an impact on ground-level O3 concentrations by modifying the atmospheric conditions that promote O3 generation. The frequency and length of high O3 occurrences, for instance, may increase with increasing temperatures and changes in atmospheric circulation patterns, but drought conditions may decrease plant ability to absorb O3 and other pollutants. Additionally, precursor emissions can potentially be impacted by climate change. For instance, rising temperatures may cause plants to produce more biogenic VOCs, and shifting rainfall patterns may have an impact on soil NOx emission rates. Therefore, both precursor emissions and climate change must be considered and addressed in order to correctly anticipate future ground-level O3 concentrations. The work covers the results of previous studies on precursor emissions...
|
|
|
Vertical gradient of ambient air pollutant levels
Binda, Denis ; Hůnová, Iva (advisor) ; Zíková, Naděžda (referee)
Ambient air pollution, caused by harmful pollutants, is considered a severe problem for the natural environment and its components. Effective pollution regulation is possible with reliable data from monitoring stations covering the whole country. Those stations are mainly located at the altitude of 2 m above the surface, possessing their well-known horizontal representativeness. However, the knowledge of the vertical representativeness of these monitoring stations is not sufficient, causing problems while determining the relevance of these measurements for studying the effects of pollutants in various altitudes. The gradient of ozone concentration (determining the change of ozone concentration for each 10 m) was computed to determine the vertical profile of tropospheric ozone (the gradient in this work is using the unit [μg.m-3 /10 m]). Data, containing the ozone concentrations, were measured in altitudes of 2, 8, 50 and 230 m and sourced from the National atmospheric observatory Košetice in the time interval from 6.9.2013 to 31.12.2020. The ozone concentrations show a yearly periodicity, with higher values during the summer period (from 1.4. to 30.9.) and lower values during the winter period (from 1.10. to 31.3.). The gradient for layer 230-50 m outlines considerable stability throughout the year...
|
|
| |
guest ::
