Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 28, Issue 13, Pages 2601-2604Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2001GL013120
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Mineral dusts inside aqueous atmospheric particles provide surfaces that induce crystallization during episodes of decreasing relative humidity (RH). Submicron aqueous ammonium sulfate pal-tides containing hematite (alpha -Fe2O3) and corundum (alpha -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 10(10.4) sites cm(-2) and m < 0 for alpha -Al2O3 and 10(9) sites cm(-2) and m = 0.04 for alpha -Fe2O3 particles.
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