气候变化领域集成服务门户(CCPortal): Secondary ice production processes in wintertime alpine mixed-phase clouds

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DOI	10.5194/acp-22-1965-2022
	Secondary ice production processes in wintertime alpine mixed-phase clouds
	Georgakaki, Paraskevi; Sotiropoulou, Georgia; Vignon, Etienne; Billault-Roux, Anne-Claire; Berne, Alexis; Nenes, Athanasios
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	1965
结束页码	1988
卷号	22 期号:3 页码:24
英文摘要	Observations of orographic mixed-phase clouds (MPCs) have long shown that measured ice crystal number concentrations (ICNCs) can exceed the concentration of ice nucleating particles by orders of magnitude. Additionally, model simulations of alpine clouds are frequently found to underestimate the amount of ice compared with observations. Surface-based blowing snow, hoar frost, and secondary ice production processes have been suggested as potential causes, but their relative importance and persistence remains highly uncertain. Here we study ice production mechanisms in wintertime orographic MPCs observed during the Cloud and Aerosol Characterization Experiment (CLACE) 2014 campaign at the Jungfraujoch site in the Swiss Alps with the Weather Research and Forecasting model (WRF). Simulations suggest that droplet shattering is not a significant source of ice crystals at this specific location, but breakups upon collisions between ice particles are quite active, elevating the predicted ICNCs by up to 3 orders of magnitude, which is consistent with observations. The initiation of the ice-ice collisional breakup mechanism is primarily associated with the occurrence of seeder-feeder events from higher precipitating cloud layers. The enhanced aggregation of snowflakes is found to drive secondary ice formation in the simulated clouds, the role of which is strengthened when the large hydrometeors interact with the primary ice crystals formed in the feeder cloud. Including a constant source of cloud ice crystals from blowing snow, through the action of the breakup mechanism, can episodically enhance ICNCs. Increases in secondary ice fragment generation can be counterbalanced by enhanced orographic precipitation, which seems to prevent explosive multiplication and cloud dissipation. These findings highlight the importance of secondary ice and seeding mechanisms - primarily falling ice from above and, to a lesser degree, blowing ice from the surface - which frequently enhance primary ice and determine the phase state and properties of MPCs.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000758215000001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273864
作者单位	Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Stockholm University; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Ecole des Ponts ParisTech; UDICE-French Research Universities; Sorbonne Universite; Universite Paris Cite; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Foundation for Research & Technology - Hellas (FORTH); Institute of Chemical Engineering Sciences (ICE-HT)
推荐引用方式 GB/T 7714	Georgakaki, Paraskevi,Sotiropoulou, Georgia,Vignon, Etienne,et al. Secondary ice production processes in wintertime alpine mixed-phase clouds[J],2022,22(3):24.
APA	Georgakaki, Paraskevi,Sotiropoulou, Georgia,Vignon, Etienne,Billault-Roux, Anne-Claire,Berne, Alexis,&Nenes, Athanasios.(2022).Secondary ice production processes in wintertime alpine mixed-phase clouds.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(3),24.
MLA	Georgakaki, Paraskevi,et al."Secondary ice production processes in wintertime alpine mixed-phase clouds".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.3(2022):24.