Journal article

Experimental study of the role of physicochemical surface processing on the in ability of mineral dust particles

Niedermeier D, Hartmann S, Clauss T, Wex H, Kiselev A, Sullivan R, Demott P, Petters M, Reitz P, Schneider J, Mikhailov E, Sierau B, Stetzer O, Reimann B, Bundke U, Shaw R, Buchholz A, Mentel T, Stratmann F ...see all

Atmospheric Chemistry and Physics, vol. 11, issue 21 (2011) pp. 11131-11144

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During the measurement campaign FROST 2 (FReezing Of duST 2), the Leipzig Aerosol Cloud Interaction Simulator (LACIS) was used to investigate the influence of various surface modifications on the ice nucleating ability of Arizona Test Dust (ATD) particles in the immersion freezing mode. The dust particles were exposed to sulfuric acid vapor, to water vapor with and without the addition of ammonia gas, and heat using a thermodenuder operating at 250 degrees C. Size selected, quasi monodisperse particles with a mobility diameter of 300 nm were fed into LACIS and droplets grew on these particles such that each droplet contained a single particle. Temperature dependent frozen fractions of these droplets were determined in a temperature range between -40 degrees C -35 degrees C) and a slight increase in the second branch (T

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