Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2601m&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 13, p. 2601-2604
Physics
18
Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Cloud Physics And Chemistry
Scientific paper
Mineral dusts inside aqueous atmospheric particles provide surfaces that induce crystallization during episodes of decreasing relative humidity (RH). Submicron aqueous ammonium sulfate particles containing hematite (α-Fe2O3) and corundum (α-Al2O3) inclusions are investigated in an aerosol flow tube at 298 K. As compared to 35% RH where homogeneous nucleation is rapid, the heterogeneous nuclei regulate the RH from 35% up to 60% RH as the inclusion size varies from 50 to 450 nm. The strong size dependence can be rationalized by an active site model. Model optimization yields 1010.4 sites cm-2 and m<0 for α-Al2O3 and 109 sites cm-2 and m=0.04 for α-Fe2O3 particles.
Han Jeong-Ho
Hung Hui-Ming
Martin Scot T.
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