气候变化领域集成服务门户(CCPortal): Modeling near-surface firn temperature in a cold accumulation zone (Col du Dôme, French Alps): From a physical to a semi-parameterized approach

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DOI	10.5194/tc-8-689-2014
	Modeling near-surface firn temperature in a cold accumulation zone (Col du Dôme, French Alps): From a physical to a semi-parameterized approach
	Gilbert A.; Vincent C.; Six D.; Wagnon P.; Piard L.; Ginot P.
发表日期	2014
ISSN	19940416
卷号	8 期号:2
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).
学科领域	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
语种	英语
scopus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
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120125
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
推荐引用方式 GB/T 7714	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],2014,8(2).
APA	Gilbert A.,Vincent C.,Six D.,Wagnon P.,Piard L.,&Ginot P..(2014).Modeling near-surface firn temperature in a cold accumulation zone (Col du Dôme, French Alps): From a physical to a semi-parameterized approach.Cryosphere,8(2).
MLA	Gilbert A.,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".Cryosphere 8.2(2014).