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• W4387054636 abstract "Aerosol particles play an important role in the atmosphere. They can affect climate directly by scattering or absorbing solar radiation. They can also modify climate indirectly by acting as seeds in cloud droplet formation, and therefore further modify cloud properties such as their lifetime. A change in cloud lifetime further affects cloudiness and rainfall patterns on the Earth. The climate effects of aerosols depend on their properties, such as particle size and chemical composition. Black carbon is a highly light-absorbing aerosol, as an example. Thus, it is important to know how these aerosol particle properties are changing in the air in different conditions. The aims of this thesis are to better understand how the meteorological conditions during small- and large-scale transport affect aerosol particle properties from various sources and how the properties are changing in different boundary layer conditions. In this thesis, effects of local meteorological conditions on aerosol particle properties and sulfur dioxide (SO2) concentration were investigated in the United Arab Emirates. The combination of surface aerosol particle measurements and boundary layer profiling enabled to identify periods when pollution from remote sources was mixed down to the surface. It also enabled to determine that the primary source of black carbon containing aerosol was local, whereas remote sources were responsible for SO2. Impacts of precipitation on aerosol particle number size distributions in the Maldives were also studied in the thesis. During the south-west monsoon season, precipitation efficiently removed accumulation mode aerosol particles. The number of nucleation mode aerosol particles remained similar or slightly increased in air masses with higher accumulated precipitation. It was observed that the aerosol particle number concentration had increased between two measurement periods with a 10-year gap in between. Simultaneous increase is observed in aerosol optical depth (AOD) from long-term satellite observations, and the increase is also partly explained by environmental factors, such as changes in precipitation or air flow patterns. The results of this thesis underline the importance of long-term measurements to detect the changes in the aerosol particle properties and track the responsible factors for the changes. The thesis also shows the added value of combining comprehensive surface aerosol particle measurements with boundary layer profiling." @default.
• W4387054636 created "2023-09-27" @default.
• W4387054636 creator A5016417744 @default.
• W4387054636 date "2023-09-26" @default.
• W4387054636 modified "2023-09-27" @default.
• W4387054636 title "Impact of Local Meteorological Conditions on Aerosol Particle Properties" @default.
• W4387054636 doi "https://doi.org/10.35614/isbn.9789523361751" @default.
• W4387054636 hasPublicationYear "2023" @default.
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