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contributor authorNiemand, Monika
contributor authorMöhler, Ottmar
contributor authorVogel, Bernhard
contributor authorVogel, Heike
contributor authorHoose, Corinna
contributor authorConnolly, Paul
contributor authorKlein, Holger
contributor authorBingemer, Heinz
contributor authorDeMott, Paul
contributor authorSkrotzki, Julian
contributor authorLeisner, Thomas
date accessioned2017-06-09T16:54:35Z
date available2017-06-09T16:54:35Z
date copyright2012/10/01
date issued2012
identifier issn0022-4928
identifier otherams-76358.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218796
description abstractn climate and weather models, the quantitative description of aerosol and cloud processes relies on simplified assumptions. This contributes major uncertainties to the prediction of global and regional climate change. Therefore, models need good parameterizations for heterogeneous ice nucleation by atmospheric aerosols. Here the authors present a new parameterization of immersion freezing on desert dust particles derived from a large number of experiments carried out at the Aerosol Interaction and Dynamics in the Atmosphere (AIDA) cloud chamber facility. The parameterization is valid in the temperature range between ?12° and ?36°C at or above water saturation and can be used in atmospheric models that include information about the dust surface area. The new parameterization was applied to calculate distribution maps of ice nuclei during a Saharan dust event based on model results from the regional-scale model Consortium for Small-Scale Modelling?Aerosols and Reactive Trace Gases (COSMO-ART). The results were then compared to measurements at the Taunus Observatory on Mount Kleiner Feldberg, Germany, and to three other parameterizations applied to the dust outbreak. The aerosol number concentration and surface area from the COSMO-ART model simulation were taken as input to different parameterizations. Although the surface area from the model agreed well with aerosol measurements during the dust event at Kleiner Feldberg, the ice nuclei (IN) number concentration calculated from the new surface-area-based parameterization was about a factor of 13 less than IN measurements during the same event. Systematic differences of more than a factor of 10 in the IN number concentration were also found among the different parameterizations. Uncertainties in the modeled and measured parameters probably both contribute to this discrepancy and should be addressed in future studies.
publisherAmerican Meteorological Society
titleA Particle-Surface-Area-Based Parameterization of Immersion Freezing on Desert Dust Particles
typeJournal Paper
journal volume69
journal issue10
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/JAS-D-11-0249.1
journal fristpage3077
journal lastpage3092
treeJournal of the Atmospheric Sciences:;2012:;Volume( 069 ):;issue: 010
contenttypeFulltext


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