DOI: 10.1029/2019JD030922
论文题名: The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures
作者: Mahrt F. ; Kilchhofer K. ; Marcolli C. ; Grönquist P. ; David R.O. ; Rösch M. ; Lohmann U. ; Kanji Z.A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2020
卷: 125, 期: 3 语种: 英语
英文关键词: atmospheric aging
; black carbon
; cirrus clouds
; cloud processing
; ice nucleating particles
; soot
; soot morphology
Scopus关键词: aerosol
; cirrus
; cloud cover
; global climate
; precipitation (climatology)
; relative humidity
; soot
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159265
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Journal of Geophysical Research: Atmospheres,2020-01-01,125(3)