气候变化领域集成服务门户(CCPortal): Changes in active layer thickness over the Qinghai-Tibetan Plateau from 1995 to 2007

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DOI	10.1029/2009JD012974
	Changes in active layer thickness over the Qinghai-Tibetan Plateau from 1995 to 2007
	Wu, Qingbai; Zhang, Tingjun
发表日期	2010
ISSN	2169-897X
EISSN	2169-8996
卷号	115
英文摘要	The active layer over permafrost plays a significant role in surface energy balance, hydrologic cycle, carbon fluxes, ecosystem, and landscape processes and on the human infrastructure in cold regions. Over a period from 1995 to 2007, a systematic soil temperature measurement network of 10 sites was established along the Qinghai-Tibetan Highway. Soil temperatures up to 12 m depth were continuously measured semimonthly. In this study, we investigate spatial variations of active layer thickness (ALT) and its change over the period of record. We found that ALT can be estimated with confidence using semimonthly soil temperature profiles compared to those determined from available daily soil temperature profiles over the Qinghai-Tibetan Plateau. The primary results demonstrate that long term and spatially averaged ALT is similar to 2.41 m with a range of 1.32-4.57 m along the Qinghai-Tibetan Highway. All monitoring sites show an increase in ALT over the period of their records. The mean increasing rate of ALT is similar to 7.5 cm/yr. ALT shows a closely positive correlation with the thawing index of air temperature on the plateau. We estimated ALT using the thawing index over a period from 1956 to 2005 near the Wudaoliang Meteorological Station in the northern plateau. ALT had no or very limited change from 1956 to 1983 and a sharp increase of similar to 39 cm from 1983 to 2005. The magnitude of ALT increase is greater in the warm permafrost region than in the cold permafrost region. The primary control of increase in ALT is caused by an increase in summer air temperature, whereas changes in the winter air temperature and snow cover condition play no or a very limited role.
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS关键词	MONITORING CALM SITES ; MACKENZIE VALLEY ; PERMAFROST ; CLIMATE ; NORTHERN ; PATTERNS ; SUMMER ; ALASKA
WOS记录号	WOS:000277705900002
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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/240275
作者单位	[Wu, Qingbai; Zhang, Tingjun] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China; [Zhang, Tingjun] Univ Colorado, Cooperat Inst Res Environm Sci, Natl Snow & Ice Data Ctr, Boulder, CO 80309 USA
推荐引用方式 GB/T 7714	Wu, Qingbai,Zhang, Tingjun. Changes in active layer thickness over the Qinghai-Tibetan Plateau from 1995 to 2007[J]. 中国科学院西北生态环境资源研究院,2010,115.
APA	Wu, Qingbai,&Zhang, Tingjun.(2010).Changes in active layer thickness over the Qinghai-Tibetan Plateau from 1995 to 2007.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,115.
MLA	Wu, Qingbai,et al."Changes in active layer thickness over the Qinghai-Tibetan Plateau from 1995 to 2007".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 115(2010).