The contribution of sulfuric acid and non-volatile compounds on the growth of freshly formed atmospheric aerosols

Details The contribution of sulfuric acid and non-volatile compounds on the growth of freshly formed atmospheric aerosols The contribution of sulfuric acid and non-volatile compounds on the growth of freshly formed atmospheric aerosols

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3217810w&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 17, CiteID L17810

Physics

29

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Global Change: Atmosphere (0315, 0325)

Scientific paper

The formation of atmospheric aerosol particles (homogeneous nucleation, forming of stable clusters ~1 nm in size), their subsequent growth to detectable sizes (>3 nm), and to the size of cloud condensation nuclei, remains one of the least understood atmospheric processes upon which global climate change critically depends. However, a quantitative model explanation for the growth of freshly formed aerosols has been missing. In this study, we present observations explaining the nucleation mode (3-25 nm) growth. Aerosol particles typically grow from 3 nm to 60-70 nm during a day, while their non-volatile cores grow by 10-20 nm as well. The total particle growth rate is 2-8 nm/h while the non-volatile core material can explain 20-40%. According to our results, sulfuric acid can explain the remainder of the growth, until the particle diameter is around 10-20 nm. After that secondary organic compounds significantly take part in growth process.

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