Laboratory-measured nucleation rates of sulfuric acid and water binary homogeneous nucleation from the SO2 + OH reaction

Details Laboratory-measured nucleation rates of sulfuric acid and water binary homogeneous nucleation from the SO2 + OH reaction Laboratory-measured nucleation rates of sulfuric acid and water binary homogeneous nucleation from the SO2 + OH reaction

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3511801b&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 11, CiteID L11801

Physics

24

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry

Scientific paper

We have measured H2SO4-H2O nucleation rates (J) at atmospheric pressure, 288 K and 10-55 % relative humidity (RH). H2SO4 was produced from the SO2 + OH -> HSO3 reaction and was measured with a chemical ionization mass spectrometer (CIMS). The CIMS-measured [H2SO4] that is required to produce the unit J ranged from 107-108 cm-3, but if wall loss is taken into account the threshold [H2SO4] was at the 108-109 cm-3 range, much higher than the atmospheric conditions. The measured J was proportional to [H2SO4] with the second to tenth powers and proportional to RH with the eleventh to fifteenth powers. The measured aerosol sizes were proportional to log RH, showing a weak dependence of aerosol growth on RH. But the RH effects were more pronounced at higher [H2SO4], indicating that RH is more important for aerosol growth in the H2SO4 rich environment.

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