Nucleation rate of particles in the lower atmosphere: Estimated time needed to reach pseudo-steady state and sensitivity to H2SO4 gas concentration

Details Nucleation rate of particles in the lower atmosphere: Estimated time needed to reach pseudo-steady state and sensitivity to H2SO4 gas concentration Nucleation rate of particles in the lower atmosphere: Estimated time needed to reach pseudo-steady state and sensitivity to H2SO4 gas concentration

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j..33y&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 10, pp. 33-1, CiteID 1526, DOI 10.1029/2003GL017084

Physics

5

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Troposphere-Composition And Chemistry

Scientific paper

Using a kinetic model, we estimate the time-needed (t0) to establish a pseudo-steady state nucleation when sulfuric acid concentration ([H2SO4]) suddenly increases to a certain fixed level. We find that t0 is roughly inversely proportional to [H2SO4]. The assumption of instantaneously achieved pseudo-steady state concentration of critical clusters, on which the classical nucleation theories are based, is no longer valid when t0 is longer than the time period that [H2SO4] can be treated as constant. Under the lower marine atmospheric conditions considered in this study, the nucleation rate predicted by ion-mediated nucleation theory is very sensitive to [H2SO4] when [H2SO4] is low (<~7 × 106/cm3) but such a sensitivity reduces significantly as [H2SO4] increases, which is quite different from that predicted with classical binary and ternary homogeneous nucleation theories.

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