Cloud condensation nucleus production from nucleation events at a highly polluted region

Details Cloud condensation nucleus production from nucleation events at a highly polluted region Cloud condensation nucleus production from nucleation events at a highly polluted region

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3206812l&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 6, CiteID L06812

Physics

78

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251)

Scientific paper

Atmospheric nucleation events have received increasing attention as a potentially important source of aerosol particles affecting climate and human health. Here, we report 2.5 years of continuous nucleation observations from San Pietro Capofiume, Italy (44°39'N, 11°37'W). We show that nucleation events occur frequently in the Po Valley region, even though the region is rather polluted with high pre-existing particle concentrations. The nucleation events are often very intensive, and the newly formed particles can grow to sizes as large as 100-200 nm in diameter within a few hours. Our calculations of the enhancement of particle number concentrations in different size ranges and comparison with steady-state and regional emission estimates indicate that the nucleation events produce a significant fraction of particles larger than 100 nm, and thus constitute an important source of cloud condensation nuclei (CCN).

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