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	Observational study on the active layer freeze-thaw cycle in the upper reaches of the Heihe River of the north-eastern Qinghai-Tibet Plateau
	Wang, Qingfeng1; Zhang, Tingjun2; Jin, Huijun1; Cao, Bin2; Peng, Xiaoqing2; Wang, Kang2; Li, Lili2; Guo, Hong2; Liu, Jia2; Cao, Lin2
刊名	QUATERNARY INTERNATIONAL
	2017-06-10
卷号	440页码:13-22
关键词	Alpine permafrost regions Active layer Seasonal freeze-thaw cycle Local factors Upper reaches of the Heihe River (URHHR) Qilian Mountains
ISSN号	1040-6182
DOI	10.1016/j.quaint.2016.08.027
通讯作者	Zhang, Tingjun(tjzhang@lzu.edu.cn) ; Jin, Huijun(hjjin@lzb.ac.cn)
英文摘要	Observational data collection on permafrost and active layer freeze thaw cycle is extremely limited in the upper reaches of the Heihe River (URHHR) in the Qilian Mountains of the north-eastern Qinghai Tibet Plateau. It acts as a bottleneck, restricting the hydrological effects of the changes in the permafrost and active layer in the Heihe River Basin. Using soil temperature, moisture and air temperature data collected from the four active layer observation sites (ALl, AL3, AL4 and AL7) established in the alpine permafrost regions in the URHHR, from 2013 to 2014, the region's active layer freeze thaw cycle and the soil hydrothermal dynamics were comparatively analysed. As the elevation increased from 3700 m a.s.l. to 4132 m a.s.l., the mean annual ground temperatures (MAGTs) of the active layer and the active layer thicknesses (ALTS) decreased, the onset date of soil freeze of the active layer occurred earlier and the soil freeze rate increased. However, the onset date of soil thaw and the thaw rate did not exhibit significant trends. Compared to the thaw process, the duration of the active layer freeze process was significantly shortened and its rate was significantly higher. The soil freeze from bottom to top did not occur earlier than that from top to bottom. Furthermore, as elevation increased, the proportion of the bottom -up freeze layer thickness increased. The soil moisture in the thaw layer continuously moved to the freeze front during the active layer's two-way freeze process, causing the thaw layer to be dewatered. The seasonal thaw process resulted in significant reduction of the soil water content in the thaw layer, accounting for the high ice content in the vicinity of the permafrost table. Controlled by elevation, the active layer's seasonal freeze thaw cycle was also affected by local factors, such as vegetation, slope, water (marsh water and super -permafrost water), lithology and water (ice) content. This study provides quantitative data that identify, simulate and predict the hydrological effects of the changes in the permafrost and active layer of the Heihe River Basin. (C) 2016 Elsevier Ltd and INQUA. All rights reserved.
收录类别	SCI
WOS关键词	PERMAFROST REGION ; VEGETATION COVER ; COASTAL-PLAIN ; SOIL ; ALASKA ; TEMPERATURE ; BASIN
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000404311300002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557742
专题	寒区旱区环境与工程研究所
通讯作者	Zhang, Tingjun; Jin, Huijun
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, 320 Donggang West Rd, Lanzhou 730000, Gansu, Peoples R China 2.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, 222 Tianshui South Rd, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Qingfeng,Zhang, Tingjun,Jin, Huijun,et al. Observational study on the active layer freeze-thaw cycle in the upper reaches of the Heihe River of the north-eastern Qinghai-Tibet Plateau[J]. QUATERNARY INTERNATIONAL,2017,440:13-22.
APA	Wang, Qingfeng.,Zhang, Tingjun.,Jin, Huijun.,Cao, Bin.,Peng, Xiaoqing.,...&Cao, Lin.(2017).Observational study on the active layer freeze-thaw cycle in the upper reaches of the Heihe River of the north-eastern Qinghai-Tibet Plateau.QUATERNARY INTERNATIONAL,440,13-22.
MLA	Wang, Qingfeng,et al."Observational study on the active layer freeze-thaw cycle in the upper reaches of the Heihe River of the north-eastern Qinghai-Tibet Plateau".QUATERNARY INTERNATIONAL 440(2017):13-22.

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