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The volatility of ice below 160K

Leisner, Thomas; Nachbar, Mario; Duft, Denis

Abstract (englisch):
Amorphous solid water (ASW) is probably the most abundant form of water in the universe. It forms when water vapor deposits at low temperatures. At temperatures above about 130K ASW crystallizes on time scales below one day, thereby forming nano-crystalline ice. Up to now, the saturation vapor pressure of ASW and nano-crystalline ice were not well characterized, but are crucial to describe the sublimation and growth of interstellar ices or cold ice cloud formation in planetary atmospheres, e.g. polar mesospheric clouds on Earth and H2O clouds on Mars.
In this contribution, we present results from a laboratory experiment which is designed to study ice nucleation and growth processes on nanoparticles at temperatures below 150K. We use the ice growth-rate on nanoparticles at low and high supersaturation to evaluate for the saturation vapor pressure of ice phases deposited below 160K. We conclude, that ASW initially deposits, followed by temperature activated crystallization to nano-crystalline ice with crystal sizes between 7 and 19nm. We show that the saturation vapor pressure of ASW is substantially higher than previously assumed. P ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Poster
Jahr 2018
Sprache Englisch
Identifikator KITopen ID: 1000086652
HGF-Programm 12.04.02; LK 01
Erschienen in 677. WE-Heraeus-Seminar: Towards a Molecular Understanding of Atmospheric Aerosols, Bad Honnef, 26.-31.08.2018
Schlagworte water ice, vapor pressure, amorphous solid water
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