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DOI	10.1007/s12665-015-5229-2
	Recent changes in the active layer thickness across the northern hemisphere
	Luo, Dongliang; Wu, Qingbai; Jin, Huijun; Marchenko, Sergey S.; Lu, Lanzhi; Gao, Siru
发表日期	2016
ISSN	1866-6280
EISSN	1866-6299
卷号	75 期号:7
英文摘要	To better understand the ecological and hydrological responses to climatic and cryospheric changes, the spatiotemporal variations in the active layer thickness (ALT) need to be scrupulously studied. Based on more than 230 sites from the circumpolar active layer monitoring network, the spatiotemporal characteristics of the ALT across the northern hemisphere during 1990-2015 were investigated. Results indicate that the ALT exhibits substantial spatial variations across the northern hemisphere, ranging from approximately 30 cm in the arctic and subarctic regions to greater than 10 m in the mountainous permafrost regions at mid-latitudes. Regional averages of ALT are 48 cm in Alaska, 93 cm in Canada, 164 cm in the Nordic countries (including Greenland and Svalbard) and Switzerland, 330 cm in Mongolia, 476 cm in Kazakhstan, and 230 cm on the Qinghai-Tibetan Plateau (QTP), respectively. In Russia, the regional averages of ALT in European North, West Siberia, Central Siberia, Northeast Siberia, Chukotka, and Kamchatka are 110, 92, 69, 61, 53 and 60 cm, respectively. Increasing trends of ALT were not uniformly present in the observational records. Significant changes in the ALT were observed at 73 sites, approximately 43.2 % of the investigated 169 sites that are available for statistical analysis. Less than 25 % Alaskan sites and approximately 33 % Canadian sites showed significant increase in the ALT. On the QTP, almost all the sites showed significant ALT increases. Insignificant increase and even decrease in the ALT were observed in some parts of the northern hemisphere, e.g., Mongolia, parts of Alaska and Canada. The air and ground temperatures, vegetation, substrate, microreliefs, and soil moisture in particular, play decisive roles in the spatiotemporal variations in the ALT, but the relationships among each other are complicated and await further studies.
英文关键词	Circumpolar active layer monitoring (CALM) program; Active layer thickness (ALT); Northern hemisphere; Cryosphere and climate change; Spatiotemporal variations
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS关键词	NEAR-SURFACE PERMAFROST ; THERMAL STATE ; THAWING PERMAFROST ; SOIL-TEMPERATURE ; CENTRAL ALASKA ; CLIMATE ; VARIABILITY ; BASIN ; MOUNTAINS ; MOISTURE
WOS记录号	WOS:000373635400014
来源期刊	ENVIRONMENTAL EARTH SCIENCES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/240283
作者单位	[Luo, Dongliang; Wu, Qingbai; Jin, Huijun; Marchenko, Sergey S.; Lu, Lanzhi; Gao, Siru] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China; [Marchenko, Sergey S.] Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA
推荐引用方式 GB/T 7714	Luo, Dongliang,Wu, Qingbai,Jin, Huijun,et al. Recent changes in the active layer thickness across the northern hemisphere[J]. 中国科学院西北生态环境资源研究院,2016,75(7).
APA	Luo, Dongliang,Wu, Qingbai,Jin, Huijun,Marchenko, Sergey S.,Lu, Lanzhi,&Gao, Siru.(2016).Recent changes in the active layer thickness across the northern hemisphere.ENVIRONMENTAL EARTH SCIENCES,75(7).
MLA	Luo, Dongliang,et al."Recent changes in the active layer thickness across the northern hemisphere".ENVIRONMENTAL EARTH SCIENCES 75.7(2016).