DOI: 10.5194/tc-9-647-2015
Scopus记录号: 2-s2.0-84927589020
论文题名: Warming permafrost and active layer variability at Cime Bianche, Western European Alps
作者: Pogliotti P ; , Guglielmin M ; , Cremonese E ; , Morra Di Cella U ; , Filippa G ; , Pellet C ; , Hauck C
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 2 起始页码: 647
结束页码: 661
语种: 英语
英文关键词: active layer
; borehole
; permafrost
; snow cover
; spatial variation
; surface temperature
; temporal evolution
; warming
; Alps
英文摘要: The objective of this paper is to provide a first synthesis on the state and recent evolution of permafrost at the monitoring site of Cime Bianche (3100 m a.s.l.) on the Italian side of the Western Alps. The analysis is based on 7 years of ground temperature observations in two boreholes and seven surface points. The analysis aims to quantify the spatial and temporal variability of ground surface temperature in relation to snow cover, the small-scale spatial variability of the active layer thickness and current temperature trends in deep permafrost. Results show that the heterogeneity of snow cover thickness, both in space and time, is the main factor controlling ground surface temperatures and leads to a mean range of spatial variability (2.5 ± 0.1 °C) which far exceeds the mean range of observed inter-annual variability (1.6 ± 0.1 °C). The active layer thickness measured in two boreholes at a distance of 30 m shows a mean difference of 2.0 ± 0.1 m with the active layer of one borehole consistently deeper. As revealed by temperature analysis and geophysical soundings, such a difference is mainly driven by the ice/water content in the sub-surface and not by the snow cover regimes. The analysis of deep temperature time series reveals that permafrost is warming. The detected trends are statistically significant starting from a depth below 8 m with warming rates between 0.1 and 0.01 °C yr-1. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75320
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: Environmental Protection Agency of Valle d'Aosta, Saint Christophe, Italy; Department of Theoretical and Applied Sciences, Insubria University, Varese, Italy; Department of Geosciences, University of Fribourg, Fribourg, Switzerland
Recommended Citation:
Pogliotti P,, Guglielmin M,, Cremonese E,et al. Warming permafrost and active layer variability at Cime Bianche, Western European Alps[J]. Cryosphere,2015-01-01,9(2)