<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Ice nucleation properties of mineral dusts"^^ . "Ice nucleation in clouds has a significant impact on the global hydrological cycle as well as on the\r\nradiative budget of the Earth. The AIDA cloud chamber was used to investigate the ice nucleation\r\nefficiency of various atmospherically relevant mineral dusts. From experiments with Arizona Test Dust (ATD) a humidity and temperature dependent ice nucleation\r\nactive surface site density parameterization was developed to describe deposition nucleation\r\nat temperatures above 220 K. Based on these results, a parameterization for deposition nucleation\r\ninitiated by desert dusts and clay minerals is proposed. The time dependence observed during the\r\ndeposition nucleation experiments with ATD seems to be relevant only at very small cooling rates.\r\nExperiments with atmospherically relevant dust samples revealed large differences in the ice nucleation\r\nefficiencies among the different dusts. Volcanic ash emitted during the Eyjafjallajökull\r\neruption in 2010 proved to be slightly less ice-active than mineral dust particles from desert areas.\r\nIn contrast, soil dust particles rich in organic matter and fossile diatomite were very ice-active particles.\r\nFor the soil dust particles, the soil organic matter is probably the reason for the enhanced\r\nice nucleation efficiency compared to desert dusts which is, however, most likely not directly determined\r\nby viable organisms such as fungi or bacteria. Coatings with secondary organic compounds led to a significant deterioration of the ice nucleation\r\nefficiency observed for fossil diatomite in the immersion freezing and the deposition nucleation\r\nmode. Deposition mode nucleation initiated by mineral dust particles was suppressed by coatings\r\nwith sulfuric acid whereas there was no effect on the immersion freezing properties. The immersion freezing properties of several substrates used as ice nuclei substitutes were investigated\r\nwith a cold stage setup. Muscovite initiated heterogeneous ice nucleation at approximately\r\n250 K but was much less ice-active than mineral dusts. Droplets placed on silicon wafers froze\r\nonly close to the homogeneous freezing threshold. The freezing properties of these silicon wafers\r\ncould be changed signicantly by modifying the wafer surface through adding regular structures\r\nsuch as trenches which suggests that the surface morphology may have an influence on the ice\r\nnucleation efficiencies of atmospheric particles."^^ . "2013" . . . . . . . "Isabelle"^^ . "Steinke"^^ . "Isabelle Steinke"^^ . . . . . . "Ice nucleation properties of mineral dusts (PDF)"^^ . . . "Dissertation_IsabelleSteinke.pdf"^^ . . . "Ice nucleation properties of mineral dusts (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Ice nucleation properties of mineral dusts (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Ice nucleation properties of mineral dusts (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Ice nucleation properties of mineral dusts (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Ice nucleation properties of mineral dusts (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #15967 \n\nIce nucleation properties of mineral dusts\n\n" . "text/html" . . . "500 Naturwissenschaften und Mathematik"@de . "500 Natural sciences and mathematics"@en . .