Publications by authors named "Mika Vestenius"
This study analyzed 16070 daily and 608 weekly air filter samples from the Helsinki metropolitan area collected between 1962 and 2005. The aim was to use the Potential Source Contribution Function (PSCF) to determine potential sources of silicon (Si), zinc (Zn), lead (Pb), and radioactive isotope Pb. The main sources for Si and Pb were industrial activities, particularly mining, metal industry, and traffic.
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- Aerosols significantly influence the Arctic atmosphere's radiation balance, with organic aerosols being a major component that remains poorly understood.
- Analysis from eight Arctic observatories reveals that winter organic aerosols are primarily from anthropogenic sources in Eurasia, while summer sees a shift to natural emissions like marine and biogenic aerosols.
- The strength and effects of these aerosol sources are influenced by environmental factors like nutrient levels, solar radiation, temperature, and snow cover, providing key insights for climate impact modeling in the Arctic.