Formation of Secondary Aerosol Particles – Niels Bohr Institute - University of Copenhagen

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Formation of Secondary Aerosol Particles

Hovedfagskollokvium by Thomas B. Kristensen


Formation of Secondary Aerosol Particles in the Atmosphere

Aerosol particles play an important role in climate directly by absorbing outgoing long wave radiation and scattering/absorption of incoming sunlight. In addition the atmospheric aerosol particles play an important role in climate when it comes to optical properties and lifetimes of clouds. The aerosol particles (primary) can be emitted directly as particles or it can be formed in the atmosphere by gas to particle conversion (secondary). From size resolved measurements of the aerosol down to a diameter of ~3 nm formation rates and growth rates of the secondary aerosol particles can be inferred. Different observations and characteristics of new particle formation events will be presented and climatic impacts discussed. Sulfuric acid is considered the single most important species in atmospheric formation of new aerosol particles. The role of sulfuric acid in will be discussed on the basis of the construction of a simple H2SO4-proxy at the Hyytiälä Forestry Field Station in Finland.