DOI: 10.1002/jgrd.50822
论文题名: The microphysical properties of ice fog measured in urban environments of Interior Alaska
作者: Schmitt C.G. ; Stuefer M. ; Heymsfield A.J. ; Kim C.K.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11136
结束页码: 11147
语种: 英语
英文关键词: ice crystal habits
; ice fog
Scopus关键词: Fog
; Particle size
; Anthropogenic emissions
; Cross sectional area
; Ice crystals
; Microphysical property
; National center for atmospheric researches
; Particle geometries
; Particle terminal velocity
; Video ice particle samplers
; Ice
; anthropogenic source
; atmospheric pollution
; cooling
; cross section
; crystal
; droplet
; dust
; emission
; facilitation
; fog
; microscopy
; particle size
; particulate matter
; power plant
; size distribution
; urban area
; water vapor
; Alaska
; United States
英文摘要: The microphysical properties of ice fog were measured at two sites during a small field campaign in January and February of 2012 in Interior Alaska. The National Center for Atmospheric Research Video Ice Particle Sampler probe and Formvar (polyvinyl formal)-coated microscope slides were used to sample airborne ice particles at two polluted sites in the Fairbanks region. Both sites were significantly influenced by anthropogenic emission and additional water vapor from nearby open water power plant cooling ponds. Measurements show that ice fog particles were generally droxtal shaped (faceted, quasi-spherical) for sub-10 μm particles, while plate-shaped crystals were the most frequently observed particles between 10 and 50 μm. A visibility cutoff of 3 km was used to separate ice fog events from other observations which were significantly influenced by larger (50-150 μm) diamond dust particles. The purpose of this study is to more realistically characterize ice fog microphysical properties in order to facilitate better model predictions of the onset of ice fog in polluted environments. Parameterizations for mass and projected area are developed and used to estimate particle terminal velocity. Dimensional characteristics are based on particle geometry and indicated that ice fog particles have significantly lower densities than water droplets as well as reduced cross-sectional areas, the net result being that terminal velocities are estimated to be less than half the value of those calculated for water droplets. Particle size distributions are characterized using gamma functions and have a shape factor (μ) of between -0.5 and -1.0 for polluted ice fog conditions. Key Points New measurements of the microphysical properties of ice fog ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63279
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks AK, United States
Recommended Citation:
Schmitt C.G.,Stuefer M.,Heymsfield A.J.,et al. The microphysical properties of ice fog measured in urban environments of Interior Alaska[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)