干旱区生态环境知识资源中心(Arid): The influence of water percolation through crevasses on the thermal regime of a Himalayan mountain glacier

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DOI	10.5194/tc-14-1273-2020
	The influence of water percolation through crevasses on the thermal regime of a Himalayan mountain glacier
	Gilbert, Adrien 1; Sinisalo, Anna 2,6; Gurung, Tika R.2; Fujita, Koji 3; Maharjan, Sudan B.2; Sherpa, Tenzing C.2; Fukuda, Takehiro 4,5,7
通讯作者	Gilbert, Adrien ; Sinisalo, Anna
来源期刊	CRYOSPHERE
ISSN	1994-0416
EISSN	1994-0424
出版年	2020
卷号	14 期号:4 页码:1273-1288
英文摘要	In cold and arid climates, small glaciers with cold accumulation zones are often thought to be entirely cold based. However, scattering in ground-penetrating radar (GPR) measurements on the Rikha Samba Glacier in the Nepal Himalayas suggests a large amount of temperate ice that seems to be influenced by the presence of crevassed areas. We used a coupled thermo-mechanical model forced by a firn model accounting for firn heating to interpret the observed thermal regime. Using a simple energy conservation approach, we show that the addition of water percolation and refreezing in crevassed areas explains these observations. Model experiments show that both steady and transient thermal regimes are significantly affected by latent heat release in crevassed areas. This makes half of the glacier base temperate, resulting in an ice dynamic mainly controlled by basal friction instead of ice deformation. The timescale of thermal regime change, in response to atmospheric warming, is also greatly diminished, with a potential switch from cold to temperate basal ice in 50-60 years in the upper part of the glacier instead of the 100-150 years that it would take without the effect of the crevasses. This study highlights the crucial role of water percolation through the crevasses on the thermal regime of glaciers and validates a simple method to account for it in glacier thermo-mechanical models.
类型	Article
语种	英语
国家	Norway ; Nepal ; Japan
开放获取类型	gold, Green Submitted, Green Published
收录类别	SCI-E
WOS记录号	WOS:000527805800001
WOS关键词	COLD SURFACE-LAYER ; ICE-THICKNESS ; HIDDEN VALLEY ; MASS-BALANCE ; TEMPERATURE ; FLOW ; ACCUMULATION ; STORGLACIAREN ; PERFORMANCE ; REANALYSIS
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314294
作者单位	1.Univ Oslo, Dept Geosci, Oslo, Norway; 2.Int Ctr Integrated Mt Dev, POB 3226, Kathmandu, Nepal; 3.Nagoya Univ, Grad Sch Environm Studies, Nagoya, Aichi 4648601, Japan; 4.Hokkaido Univ, Grad Sch Environm Sci, Sapporo, Hokkaido 0600810, Japan; 5.Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan; 6.GRID, Arendal, Norway; 7.Hokkaido Govt, Sapporo, Hokkaido 0608588, Japan
推荐引用方式 GB/T 7714	Gilbert, Adrien,Sinisalo, Anna,Gurung, Tika R.,et al. The influence of water percolation through crevasses on the thermal regime of a Himalayan mountain glacier[J],2020,14(4):1273-1288.
APA	Gilbert, Adrien.,Sinisalo, Anna.,Gurung, Tika R..,Fujita, Koji.,Maharjan, Sudan B..,...&Fukuda, Takehiro.(2020).The influence of water percolation through crevasses on the thermal regime of a Himalayan mountain glacier.CRYOSPHERE,14(4),1273-1288.
MLA	Gilbert, Adrien,et al."The influence of water percolation through crevasses on the thermal regime of a Himalayan mountain glacier".CRYOSPHERE 14.4(2020):1273-1288.