Utveckling av modeller för studier av luftföroreningar
Ladda ner
Typ
Examensarbete för kandidatexamen
Bachelor Thesis
Bachelor Thesis
Program
Publicerad
2015
Författare
Almqvist, Frida
Ekström, Katrin
Bohlin, Oskar
Mårtensson, Anton
Seljelid, Eirik
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Abstract The growing population combined with an overall higher standard of living results in higher emissions of nitrogen oxides, photochemical oxidants and volatile organic compounds. Air pollution models are important tools in surveying the effects of this development and understanding how emissions spread from their point of origin. The purpose of this project is to create a complete air pollution model, given a stationary one dimensional air parcel model, the ESX model. The model will follow the flight path of an air parcel, a trajectory, along which it will collect data concerning meteorology and toxic release. The atmosphere can be divided into different boundary layers where the mixing layer is the most interesting for air pollution studies. The mixing layer is characterized by high turbulence which gives a significant mixing of emissions. An airpollution model therefore has to consider equations concerning this layer and its height, the mixing height. The project has resulted in a greater understanding of atmospheric chemistry and meteorology, but also two separate air pollution models based on the ESX model, HY- ESX and EStraX. The models are developed and executable in a Linux environment. The main difference between the two models is in how they compute the trajectories, one uses third-party application HYSPLIT and the other calculates them directly from meteorological data supplied by ECMWF. Evaluation of the models precision hasnt been fully concluded due to problems with the ESX model, but both serve as systems that provide the ESX model with necessary data through trajectory generation.
Beskrivning
Ämne/nyckelord
Hållbar utveckling , Klimatforskning , Miljötoxikologi , Sustainable Development , Climate Research , Environmental toxicology