DOI: 10.5194/tc-15-389-2021
论文题名: Macroscopic water vapor diffusion is not enhanced in snow
作者: Fourteau K. ; Domine F. ; Hagenmuller P.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 1 起始页码: 389
结束页码: 406
语种: 英语
英文关键词: diffusion
; energy balance
; moisture transfer
; snow
; snowpack
; sublimation
; water vapor
英文摘要: Water vapor transport in dry snowpacks plays a significant role for snow metamorphism and the mass and energy balance of snowpacks. The molecular diffusion of water vapor in the interstitial pores is usually considered to be the main or only transport mechanism, and current detailed snow physics models therefore rely on the knowledge of the effective diffusion coefficient of water vapor in snow. Numerous previous studies have concluded that water vapor diffusion in snow is enhanced relative to that in air. Various field observations also indicate that for vapor transport in snow to be explained by diffusion alone, the effective diffusion coefficient should be larger than that in air. Here we show using theory and numerical simulations of idealized and measured snow microstructures that, although sublimation and deposition of water vapor onto snow crystal surfaces do enhance microscopic diffusion in the pore space, this effect is more than countered by the restriction of diffusion space due to ice. The interaction of water vapor with the ice results in water vapor diffusing more than inert molecules in snow but still less than in free air, regardless of the value of the sticking coefficient of water molecules on ice. Our results imply that processes other than diffusion play a predominant role in water vapor transport in dry snowpacks. © 2021 BMJ Publishing Group. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164685
Appears in Collections: 气候变化与战略
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作者单位: Univ. Grenoble Alpes, Université de Toulouse, Météo-France, Cnrs, Cnrm, Centre d'Études de la Neige, Grenoble, France; Takuvik Joint International Laboratory, Université Laval (Canada) and CNRS-INSU France, Québec, QC G1V 0A6, Canada; Centre d'Études Nordiques (CEN) and Department of Chemistry, Université Laval, Québec, QC G1V 0A6, Canada
Recommended Citation:
Fourteau K.,Domine F.,Hagenmuller P.. Macroscopic water vapor diffusion is not enhanced in snow[J]. Cryosphere,2021-01-01,15(1)