GSTDTAP  > 地球科学
DOI10.5194/acp-2022-434
Impact of formulations of the nucleation rate on ice nucleation events
Peter Spichtinger, Patrik Marschalik, and Manuel Baumgartner
2022-06-24
发表期刊Atmospheric Chemistry and Physics
出版年2022
英文摘要

Abstract. Ice formation in cold temperature regimes is most probably dominated by homogeneous freezing of aqueous solution droplets. The nucleation rate as derived from laboratory experiments can be represented as a function of water activity. For idealized nucleation events as modelled with a state-of-the-art ice microphysics, the impact of different approximations of the nucleation rate on the resulting ice crystal number concentrations and maximum supersaturation ratios is investigated. The nucleation events are sensitive to the slope of the nucleation rate but only weakly affected by changes in its absolute value. This leads to the conclusion that details of the nucleation rate are less important for simulating ice nucleation in bulk models, if the main feature of the nucleation rate (i.e. its slope) is represented sufficiently. The weak sensitivity on the absolute values of the nucleation rate suggests that the amount of available solution droplets also does not crucially affect nucleation events. The use of just one distinct nucleation threshold for analysis and model parameterisation should be reinvestigated. The frequently used thresholds corresponding to a very high nucleation rate value is not reached in many nucleation events with low vertical updrafts. In contrast, the maximum supersaturation and thus the nucleation thresholds reached during an ice nucleation event depend on the vertical updraft velocity or cooling rate. This feature might explain some high supersaturation values during nucleation events in cloud chambers and suggests a reformulation of ice nucleation schemes used in coarse models based on a fixed nucleation threshold.

领域地球科学
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/352953
专题地球科学
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GB/T 7714
Peter Spichtinger, Patrik Marschalik, and Manuel Baumgartner. Impact of formulations of the nucleation rate on ice nucleation events[J]. Atmospheric Chemistry and Physics,2022.
APA Peter Spichtinger, Patrik Marschalik, and Manuel Baumgartner.(2022).Impact of formulations of the nucleation rate on ice nucleation events.Atmospheric Chemistry and Physics.
MLA Peter Spichtinger, Patrik Marschalik, and Manuel Baumgartner."Impact of formulations of the nucleation rate on ice nucleation events".Atmospheric Chemistry and Physics (2022).
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