On the ice-nucleating potential of warm hydrometeors in mixed-phase clouds

doi:10.5194/acp-21-561-2021

GSTDTAP > 资源环境科学

DOI	10.5194/acp-21-561-2021
	On the ice-nucleating potential of warm hydrometeors in mixed-phase clouds
	admin
	2021-02-03
出版年	2021
国家	欧洲
领域	气候变化 ; 资源环境
英文摘要	The question as to whether or not the presence of warm hydrometeors in clouds mayplay a significant role in the nucleation of new ice particles has been debatedfor several decades. While the early works of and indicated that it might be irrelevant, the more recentstudy of suggested otherwise. In this work, weattempt to quantify the ice-nucleating potential using high-fidelity flowsimulation techniques around a single hydrometeor and use favorable considerationsto upscale the effects to a collective of ice particles in clouds. While we find that ice nucleationmay be significantly enhanced in the vicinity of a warm hydrometeorand that the affected volume of air is much larger than previously estimated, it isunlikely that this effect alone causes the rapidenhancement of ice nucleation observed in some types of clouds, mainly due to the lowinitial volumetric ice concentration. Furthermore, it is demonstrated that the excess nucleationrate does not primarily depend on the rate at which cloud volume is sampled by the meteors’wakes but is rather limited by the exposure time of ice-nucleating particles to the wake,which is estimated to be of the order of few microseconds. It is suggested to further investigatethis phenomenon by tracking the trajectories of ice-nucleating particles in order to obtaina parametrization which can be implemented into existing cloud models to investigate second-order effectssuch as ice enhancement after the onset of glaciation.
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来源平台	European Geosciences Union
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/314107
专题	资源环境科学气候变化
推荐引用方式 GB/T 7714	admin. On the ice-nucleating potential of warm hydrometeors in mixed-phase clouds,2021.