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A new temperature- and humidity-dependent surface site density approach for deposition ice nucleation

Steinke, I.; Hoose, C.; Möhler, O.; Connolly, P.; Leisner, T.

Deposition nucleation experiments with Arizona Test Dust (ATD) as a surrogate for mineral dusts were conducted at the AIDA cloud chamber at temperatures between 220 and 250 K. The influence of the aerosol size distribution and the cooling rate on the ice nucleation efficiencies was investigated. Ice nucleation active surface site (INAS) densities were calculated to quantify the ice nucleation efficiency as a function of temperature, humidity and the aerosol surface area concentration. Additionally, a contact angle parameterization according to classical nucleation theory was fitted to the experimental data in order to relate the ice nucleation efficiencies to contact angle distributions. From this study it can be concluded that the INAS density formulation is a very useful tool to describe the temperature- and humidity-dependent ice nucleation efficiency of ATD particles.

Deposition nucleation on ATD particles can be described by a temperature- and relative-humidity-dependent INAS density function ns(T, Sice) with

ns(xtherm) = 1.88 ×105 · exp(0.2659 · xtherm) [m-2] , (1)

where the temperature- and saturation-dependent function xtherm is defined as

xtherm = -(T-273.2)+(Sice-1) ×100, (2)

with the saturation ratio with respect to ice Sice >1 and within a temperature range between 226 and 250 K. ... mehr

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DOI: 10.5445/IR/1000046925
DOI: 10.5194/acp-15-3703-2015
Zitationen: 14
Web of Science
Zitationen: 12
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000046925
HGF-Programm 12.01.01 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics
Band 15
Heft 7
Seiten 3703-3717
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Scopus
Web of Science
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