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oai:gupea.ub.gu.se:2077/586992019-02-22T02:34:08Zcom_2077_29047com_2077_4716com_2077_10556col_2077_29054col_2077_10557

Lutz, Anna 2019-02-21T10:28:42Z 2019-02-21T10:28:42Z 2019-02-21 978-91-7833-363-9 (PDF) ISBN: 978-91-7833-362-2 (PRINT) http://hdl.handle.net/2077/58699 Atmospheric aerosols influence our climate and air quality. Aerosol particles in the atmosphere are transformed through many different physical and chemical reactions. A substantial fraction of the particles in the atmosphere are of secondary origin, formed as a result of gas to particle conversion. The formation process of secondary organic aerosols (SOA) from oxidation of volatile organic compounds (VOC) is currently not fully understood. The objective of this thesis is to contribute to the understanding of factors important for secondary particle formation by simulating certain atmospheric processes in a flow reactor and by measurements of organic compounds in the ambient atmosphere. This work focuses on the formation of secondary organic particles via gas to particle conversion, their chemical composition and the volatility of the compounds. These factors are important for understanding the formation and evolution of secondary particles in the atmosphere, which in turn is important for making predictions about our future climate. The chemical composition of SOA was studied using a chemical ionization high-resolution time-of-flight mass spectrometer connected to a Filter Inlet for Gases and Aerosols (FIGAERO-ToF-CIMS). The analysis was performed on samples from three sites: a boreal forest in Europe, a temperate forest in North America and a semi-urban location near a major city in Asia. In order to model SOA and thus be able to predict its impact on society, in particular relating to climate change and health issues, accurate models for SOA formation are needed. The basis for such models includes understanding gas to particle partitioning and the factors that influence this partitioning. In addition, knowledge of the compounds in the particles is needed. The work revealed ways in which anthropogenic pollution could affect the partitioning and consequently the formation of SOA. It was shown that equilibrium phase partitioning behaves as predicted under some circumstances, such as when the air was not affected by anthropogenic pollution. However, when the air masses were affected by anthropogenic pollution, equilibrium phase partitioning does not behave as expected, due to restrictions in uptake and the aerosol not being in equilibrium. This effect was especially seen for highly oxygenated compounds. eng Paper I: Influence of Humidity, Temperature, and Radicals on the Formation and Thermal Properties of Secondary Organic Aerosol (SOA) from Ozonolysis of β- Pinene. Emanuelsson, E. U., Watne, Å. K., Lutz, A., Ljungström, E., & Hallquist, M. (2013). The Journal of Physical Chemistry A, 117(40), 10346-10358. ::doi:: 10.1021/jp4010218 Paper II: High-Molecular Weight Dimer Esters Are Major Products in Aerosols from α- Pinene Ozonolysis and the Boreal Forest. Kristensen, K., Watne, Å. K., Hammes, J., Lutz, A., Petäjä, T., Hallquist, M., . . . Glasius, M. (2016). Environmental Science & Technology Letters, 3(8), 280-285. ::doi:: 10.1021/acs.estlett.6b00152 Paper III: Gas to Particle Partitioning of Organic Acids in the Boreal Atmosphere Lutz, A., Hallquist, M., Mohr, C., Le Breton, M., Lopez-Hilfiker, F. D., and Thornton, J. A., Submitted to Earth and Space Chemistry (2019) Paper IV: Highly functionalized organic nitrates in the southeast United States: Contribution to secondary organic aerosol and reactive nitrogen budgets. Lee, B. H., Mohr, C., Lopez-Hilfiker, F. D., Lutz, A., Hallquist, M., . . . Thornton, J. A., (2016). Proceedings of the National Academy of Sciences of the United States of America 113 (6), 1516-1521. ::doi:: 10.1073/pnas.1508108113 Paper V: Gas and particle contributions of organic acids outside Beijing Lutz, A., Priestley, M., Salvador, C. M., Le Breton, M., Hallquist, Å. M., Pathak, R. K., Wang, Y., Zheng, J., Yang, Y., Guo, S., Hu, M., and Hallquist, M., Manuscript, (2019) gas to particle conversion volatility secondary organic aerosols FIGAERO CIMS monoterpenes isoprene SOA BVOC Secondary Organic Aerosols: Composition, Gas-to-Particle Partitioning and Physical Properties Text Doctoral thesis Doctor of Philosophy anna.lutz@gu.se University of Gothenburg. Faculty of Science Department of Chemistry and Molecular Biology ; Institutionen för kemi och molekylärbiologi Friday, 15th of March 2019, at 10:00 in room KB, Kemigården 4, Chalmers University of Technology, Gothenburg 2019-03-15 MNF open.access