气候变化领域集成服务门户(CCPortal): The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures

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DOI	10.1029/2019JD030922
	The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures
	Mahrt F.; Kilchhofer K.; Marcolli C.; Grönquist P.; David R.O.; Rösch M.; Lohmann U.; Kanji Z.A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:3
英文摘要	Soot particles are generally considered to be poor ice nucleating particles. Involvement of soot in clouds and their release back into the atmosphere can form residual particles with altered cloud forming potential. The impact and extent of such different cloud processing scenarios on ice nucleation is, however, not well understood. In this work, we present the impact of cloud processing of soot aerosols on subsequent ice nucleation cycles at T≤233 K. Coupling of two continuous flow diffusion chambers allows the simulation of different cloud processing scenarios and investigation of subsequent ice nucleation activity of the processed particles. The processing scenarios presented here encompass contrail, cirrus, and mixed-phase cloud processing, mimicking typical pathways that soot particles can be exposed to in the atmosphere. For all scenarios tested, the processed particles showed an enhanced ice active fraction for T<233 K. The relative humidity with respect to water for the ice nucleation onset was observed to be on average approximately 10% (relative humidity with respect to ice, RHi≈16%) lower for the cloud-processed particles compared to the unprocessed soot for which ice nucleation was observed close to or at homogeneous freezing conditions of solution droplets. We attribute the enhanced ice nucleation abilities of the cloud-processed soot to a pore condensation and freezing mechanism and have identified key parameters governing these changes. Enhanced ice nucleation abilities of soot in cirrus clouds can have significant impacts, given the importance of the atmospheric ice phase for precipitation formation and global climate. ©2019. The Authors.
英文关键词	atmospheric aging; black carbon; cirrus clouds; cloud processing; ice nucleating particles; soot; soot morphology
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186189
作者单位	Department of Environmental System Science, Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland; Department of Civil, Environmental and Geomatic Engineering, Institute for Building Materials, ETH Zurich, Zurich, Switzerland; Department of Functional Materials, Cellulose & Wood Materials, EMPA, Dubendorf, Switzerland; Now at Department of Geoscience, Section for Meteorology and Oceanography, University of Oslo, Oslo, Norway
推荐引用方式 GB/T 7714	Mahrt F.,Kilchhofer K.,Marcolli C.,et al. The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures[J],2020,125(3).
APA	Mahrt F..,Kilchhofer K..,Marcolli C..,Grönquist P..,David R.O..,...&Kanji Z.A..(2020).The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures.Journal of Geophysical Research: Atmospheres,125(3).
MLA	Mahrt F.,et al."The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures".Journal of Geophysical Research: Atmospheres 125.3(2020).