Studies on the connections between atmospheric sulphuric acid, new particle formation and cloud condensation nuclei

摘要: Atmospheric aerosol particles (small nm to μm sized floating in air) are an important part of the atmosphere and climate system. Aerosols directly scatter sunlight influence cloud formation, thereby causing a net cooling effect on which counteracts global warming caused by greenhouse gases. Aerosols, particularly those from anthropogenic pollution, also deteriorate human health. originate either direct particle emissions or formed gas-phase vapours through nucleation. have both natural sources. In atmosphere, formation occurs frequently continental areas all around globe, it is source condensation nuclei. Sulphuric acid one main compounds atmospheric participates nucleation growth. This thesis studied process specifically its connection gaseous sulphuric acid, based analysis field measurement data modelling. New rates were observed correlate with concentration power between 1–2. correlation was notably different than expected basis theories. Based linear squared correlation, new semi-empirical parameterisations for rate proposed: activation kinetic mechanism. Empirical coefficients determined atmosperic measured at two stations Hyytiala, Finland, Heidelberg, Germany. The factors affecting further investigated performing simulations dynamical model. relative humidity negatively rate. It proposed that cloudiness high humidities could decrease amount UV-radiation reaching ground, decreasing photochemical reaction pathway. ability boreal forest act as nuclei (CCN). events produce significant amounts potential CCN. results this provided insights acid. developed useful modelling regional models. CCN parameters environment can be applied predict aerosols’ effects climate.