气候变化领域集成服务门户(CCPortal): Conditions favorable for secondary ice production in Arctic mixed-phase clouds

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DOI	10.5194/acp-22-15579-2022
	Conditions favorable for secondary ice production in Arctic mixed-phase clouds
	Pasquier, Julie Therese; Henneberger, Jan; Ramelli, Fabiola; Lauber, Annika; David, Robert Oscar; Wieder, Joerg; Carlsen, Tim; Gierens, Rosa; Maturilli, Marion; Lohmann, Ulrike
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	15579
结束页码	15601
卷号	22 期号:23 页码:23
英文摘要	The Arctic is very susceptible to climate change and thus is warming much faster than the rest of the world. Clouds influence terrestrial and solar radiative fluxes and thereby impact the amplified Arctic warming. The partitioning of thermodynamic phases (i.e., ice crystals and water droplets) within mixed-phase clouds (MPCs) especially influences their radiative properties. However, the processes responsible for ice crystal formation remain only partially characterized. In particular, so-called secondary ice production (SIP) processes, which create supplementary ice crystals from primary ice crystals and the environmental conditions that they occur in, are poorly understood. The microphysical properties of Arctic MPCs were measured during the Ny-& Aring;lesund AeroSol Cloud ExperimENT (NASCENT) campaign to obtain a better understanding of the atmospheric conditions favorable for the occurrence of SIP processes. To this aim, the in situ cloud microphysical properties retrieved by a holographic cloud imager mounted on a tethered balloon system were complemented by ground-based remote sensing and ice-nucleating particle measurements. During the 6 d investigated in this study, SIP occurred during about 40 % of the in-cloud measurements, and high SIP events with number concentrations larger than 10 L-1 of small pristine ice crystals occurred in 4 % of the in-cloud measurements. This demonstrates the role of SIP for Arctic MPCs. The highest concentrations of small pristine ice crystals were produced at temperatures between -5 and -3 ?C and were related to the occurrence of supercooled large droplets freezing upon collision with ice crystals. This suggests that a large fraction of ice crystals in Arctic MPCs are produced via the droplet-shattering mechanism. From evaluating the ice crystal images, we could identify ice-ice collision as a second SIP mechanism that dominated when fragile ice crystals were observed. Moreover, SIP occurred over a large temperature range and was observed in up to 80 % of the measurements down to -24 ?C due to the occurrence of ice-ice collisions. This emphasizes the importance of SIP at temperatures below -8 ?C, which are currently not accounted for in most numerical weather models. Although ice-nucleating particles may be necessary for the initial freezing of water droplets, the ice crystal number concentration is frequently determined by secondary production mechanisms.
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:000898114300001
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/273543
作者单位	Swiss Federal Institutes of Technology Domain; ETH Zurich; University of Oslo; University of Cologne; Helmholtz Association; Alfred Wegener Institute, Helmholtz Centre for Polar & Marine Research; Swiss Federal Institutes of Technology Domain; ETH Zurich
推荐引用方式 GB/T 7714	Pasquier, Julie Therese,Henneberger, Jan,Ramelli, Fabiola,et al. Conditions favorable for secondary ice production in Arctic mixed-phase clouds[J],2022,22(23):23.
APA	Pasquier, Julie Therese.,Henneberger, Jan.,Ramelli, Fabiola.,Lauber, Annika.,David, Robert Oscar.,...&Lohmann, Ulrike.(2022).Conditions favorable for secondary ice production in Arctic mixed-phase clouds.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(23),23.
MLA	Pasquier, Julie Therese,et al."Conditions favorable for secondary ice production in Arctic mixed-phase clouds".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.23(2022):23.