气候变化领域集成服务门户(CCPortal): Multi-thermals and high concentrations of secondary ice: a modelling study of convective clouds during the Ice in Clouds Experiment

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DOI	10.5194/acp-22-1649-2022
	Multi-thermals and high concentrations of secondary ice: a modelling study of convective clouds during the Ice in Clouds Experiment - Dust (ICE-D) campaign
	Cui, Zhiqiang; Blyth, Alan; Huang, Yahui; Lloyd, Gary; Choularton, Thomas; Bower, Keith; Field, Paul; Hawker, Rachel; Bennett, Lindsay
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	1649
结束页码	1667
卷号	22 期号:3 页码:19
英文摘要	This paper examines the mechanisms responsible for the production of ice in convective clouds influenced by mineral dust. Observations were made in the Ice in Clouds Experiment - Dust (ICE-D) field campaign which took place in the vicinity of Cape Verde during August 2015. Measurements made with instruments on the Facility for Airborne Atmospheric Measurements (FAAM) aircraft through the clouds on 21 August showed that ice particles were observed in high concentrations at temperatures greater than about -8 degrees C. Sensitivity studies were performed using existing parameterization schemes in a cloud model to explore the impact of the freezing onset temperature, the efficiency of freezing, mineral dust as efficient ice nuclei, and multi-thermals on secondary ice production by the rime-splintering process. The simulation with the default Morrison microphysics scheme (Morrison et al., 2005) that involved a single thermal produced a concentration of secondary ice that was much lower than the observed value of total ice number concentration. Relaxing the onset temperature to a higher value, enhancing the freezing efficiency, or combinations of these increased the secondary ice particle concentration but not by a sufficient amount. Simulations that involved only dust particles as ice-nucleating particles produced a lower concentration of secondary ice particles, since the freezing onset temperature is low. The simulations implicate that a higher concentration of ice-nucleating particles with a higher freezing onset temperature may explain some of the observed high concentrations of secondary ice. However, a simulation with two thermals that used the original Morrison scheme without enhancement of the freezing efficiency or relaxation of the onset temperature produced the greatest concentration of secondary ice particles. It did so because of the increased time that graupel particles were exposed to significant cloud liquid water in the Hallett-Mossop temperature zone. The forward-facing camera and measurements of the vertical wind in repeated passes of the same cloud suggested that these tropical clouds contained multiple thermals. It is possible of course that several mechanisms, some of them only recently discovered, may be responsible for producing the ice particles in clouds. This study highlights the fact that the dynamics of the clouds likely play an important role in producing high concentrations of secondary ice particles in clouds.
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:000751879100001
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/273656
作者单位	University of Leeds; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC National Centre for Atmospheric Science; University of Leeds; University of Manchester; Met Office - UK
推荐引用方式 GB/T 7714	Cui, Zhiqiang,Blyth, Alan,Huang, Yahui,et al. Multi-thermals and high concentrations of secondary ice: a modelling study of convective clouds during the Ice in Clouds Experiment - Dust (ICE-D) campaign[J],2022,22(3):19.
APA	Cui, Zhiqiang.,Blyth, Alan.,Huang, Yahui.,Lloyd, Gary.,Choularton, Thomas.,...&Bennett, Lindsay.(2022).Multi-thermals and high concentrations of secondary ice: a modelling study of convective clouds during the Ice in Clouds Experiment - Dust (ICE-D) campaign.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(3),19.
MLA	Cui, Zhiqiang,et al."Multi-thermals and high concentrations of secondary ice: a modelling study of convective clouds during the Ice in Clouds Experiment - Dust (ICE-D) campaign".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.3(2022):19.