DOI: 10.5194/tc-10-445-2016
Scopus记录号: 2-s2.0-84959480584
论文题名: Wind tunnel experiments: Cold-air pooling and atmospheric decoupling above a melting snow patch
作者: Mott R ; , Paterna E ; , Horender S ; , Crivelli P ; , Lehning M
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 1 起始页码: 445
结束页码: 458
语种: 英语
英文关键词: anemometer
; cold air
; experimental study
; heat flow
; heat flux
; melting
; snow cover
; turbulent boundary layer
; turbulent mixing
; vertical profile
; wind tunnel
英文摘要: The longevity of perennial snowfields is not fully understood, but it is known that strong atmospheric stability and thus boundary-layer decoupling limit the amount of (sensible and latent) heat that can be transmitted from the atmosphere to the snow surface. The strong stability is typically caused by two factors, (i) the temperature difference between the (melting) snow surface and the near-surface atmosphere and (ii) cold-air pooling in topographic depressions. These factors are almost always a prerequisite for perennial snowfields to exist. For the first time, this contribution investigates the relative importance of the two factors in a controlled wind tunnel environment. Vertical profiles of sensible heat and momentum fluxes are measured using two-component hot-wire and one-component cold-wire anemometry directly over the melting snow patch. The comparison between a flat snow surface and one that has a depression shows that atmospheric decoupling is strongly increased in the case of topographic sheltering but only for low to moderate wind speeds. For those conditions, the near-surface suppression of turbulent mixing was observed to be strongest, and the ambient flow was decoupled from the surface, enhancing near-surface atmospheric stability over the single snow patch. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75182
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland; School of Architecture, Civil and Environmental Engineering, Laboratory of Cryospheric Sciences (CRYOS), Ècole Polytechnique Fèdèrale de Lausanne, Lausanne, Switzerland
Recommended Citation:
Mott R,, Paterna E,, Horender S,et al. Wind tunnel experiments: Cold-air pooling and atmospheric decoupling above a melting snow patch[J]. Cryosphere,2016-01-01,10(1)