DOI: 10.5194/tc-8-689-2014
Scopus记录号: 2-s2.0-84898822082
论文题名: Modeling near-surface firn temperature in a cold accumulation zone (Col du Dôme, French Alps): From a physical to a semi-parameterized approach
作者: Gilbert A ; , Vincent C ; , Six D ; , Wagnon P ; , Piard L ; , Ginot P
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 689
结束页码: 703
语种: 英语
英文关键词: air temperature
; cryosphere
; energy flux
; firn
; freezing
; glacier
; melting
; parameterization
; percolation
; solar radiation
; surface energy
; surface temperature
; thermal regime
; Alps
; Col du Dome
; France
; Haute Savoie
; Rhone-Alpes
英文摘要: Analysis of the thermal regime of glaciers is crucial for glacier hazard assessment, especially in the context of a changing climate. In particular, the transient thermal regime of cold accumulation zones needs to be modeled. A modeling approach has therefore been developed to determine this thermal regime using only near-surface boundary conditions coming from meteorological observations. In the first step, a surface energy balance (SEB) model accounting for water percolation and radiation penetration in firn was applied to identify the main processes that control the subsurface temperatures in cold firn. Results agree well with subsurface temperatures measured at Col du Dǒme (4250 m above sea level (a.s.l.)), France. In the second step, a simplified model using only daily mean air temperature and potential solar radiation was developed. This model properly simulates the spatial variability of surface melting and subsurface firn temperatures and was used to accurately reconstruct the deep borehole temperature profiles measured at Col du Dǒme. Results show that percolation and refreezing are efficient processes for the transfer of energy from the surface to underlying layers. However, they are not responsible for any higher energy uptake at the surface, which is exclusively triggered by increasing energy flux from the atmosphere due to SEB changes when surface temperatures reach 0 °C. The resulting enhanced energy uptake makes cold accumulation zones very vulnerable to air temperature rise. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74860
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: CNRS, LGGE, UMR5183, 38041 Grenoble, France; Univ. Grenoble Alpes, LGGE, UMR5183, 38041 Grenoble, France; IRD, LGGE, UMR5183, 38041 Grenoble, France; IRD, LTHE, UMR5564, 38041 Grenoble, France; ICIMOD, GPO Box 3226, Kathmandu, Nepal
Recommended Citation:
Gilbert A,, Vincent C,, Six D,et al. Modeling near-surface firn temperature in a cold accumulation zone (Col du Dôme, French Alps): From a physical to a semi-parameterized approach[J]. Cryosphere,2014-01-01,8(2)