globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-10-1591-2016
Scopus记录号: 2-s2.0-84979915652
论文题名:
Effects of stratified active layers on high-altitude permafrost warming: A case study on the Qinghai-Tibet Plateau
作者: Pan X; , Li Y; , Yu Q; , Shi X; , Yang D; , Roth K
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期:4
起始页码: 1591
结束页码: 1603
语种: 英语
英文关键词: active layer ; air temperature ; altitude ; data set ; permafrost ; precipitation (climatology) ; seasonal variation ; thermal conductivity ; warming ; water content ; China ; Qinghai-Xizang Plateau
英文摘要: Seasonally variable thermal conductivity in active layers is one important factor that controls the thermal state of permafrost. The common assumption is that this conductivity is considerably lower in the thawed than in the frozen state, λt=λf < 1. Using a 9-year dataset from the Qinghai- Tibet Plateau (QTP) in conjunction with the GEOtop model, we demonstrate that the ratio λt=λf may approach or even exceed 1. This can happen in thick (> 1.5 m) active layers with strong seasonal total water content changes in the regions with summer-monsoon-dominated precipitation pattern. The conductivity ratio can be further increased by typical soil architectures that may lead to a dry interlayer. The unique pattern of soil hydraulic and thermal dynamics in the active layer can be one important contributor for the rapid permafrost warming at the study site. These findings suggest that, given the increase in air temperature and precipitation, soil hydraulic properties, particularly soil architecture in those thick active layers must be properly taken into account in permafrost models. © Author(s) 2016. CC Attribution 3.0 License.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75108
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: Global Institute for Water Security, University of Saskatchewan, 11 Innovation Boulevard, Saskatoon, SK, Canada; Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Donggang West Road 320, Lanzhou, China; CSIRO Land and Water, Christian Laboratory, Clunies Ross Street, Black Mountain, Canberra, ACT, Australia; National Hydrology Research Centre, Environment Canada, 11 Innovation Boulevard, Saskatoon, SK, Canada; Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, Heidelberg, Germany

Recommended Citation:
Pan X,, Li Y,, Yu Q,et al. Effects of stratified active layers on high-altitude permafrost warming: A case study on the Qinghai-Tibet Plateau[J]. Cryosphere,2016-01-01,10(4)
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