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题名: Observational study on the active layer freeze-thaw cycle in the upper reaches of the Heihe River of the north-eastern Qinghai-Tibet Plateau
作者: Wang, QF; Zhang, TJ; Jin, HJ; Cao, B; Peng, XQ; Wang, K; Li, LL; Guo, H; Liu, J; Cao, L
收录类别: SCIE
出版日期: 2017-06-10
刊名: QUATERNARY INTERNATIONAL
卷号: 440, 页码:13-22
出版者: ELSEVIER
出版地: OXFORD
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.
关键词: Alpine permafrost regions ; Active layer ; Seasonal freeze-thaw cycle ; Local factors ; Upper reaches of the Heihe River (URHHR) ; Qilian Mountains
作者部门: [Wang, Qingfeng ; Jin, Huijun] 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 ; [Zhang, Tingjun ; Cao, Bin ; Peng, Xiaoqing ; Wang, Kang ; Li, Lili ; Guo, Hong ; Liu, Jia ; Cao, Lin] Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, 222 Tianshui South Rd, Lanzhou 730000, Gansu, Peoples R China
通讯作者: Jin, HJ (reprint author), 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. ; Zhang, TJ (reprint author), Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, 222 Tianshui South Rd, Lanzhou 730000, Gansu, Peoples R China.
学科分类: Physical Geography; Geology
文章类型: Article
所属项目编号: Chinese Academy of Sciences (CAS) Key Research Program [KZZD-EW-13] ; Natural Science Foundation (NSF) of China [91325202, 41501080] ; National Key Scientific Research Program of China [2013CBA01802] ; Talent Fund of Cold and Arid Regions Environmental and Engineering Research Institute, CAS [51Y551D71] ; State Key Laboratory of Frozen Soil Engineering [52Y452F21] ; NSF of China [91025013] ; Strategic Program of the CAS [XDA05120302]
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划)
项目资助者: NSFC ; MOST
语种: 英语
DOI: 10.1016/j.quaint.2016.08.027
ISSN号: 1040-6182
WOS记录号: WOS:000404311300002
IR记录号: WOS:000404311300002
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/189884
Appears in Collections:资源环境学院_期刊论文

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作者单位: 12ENVIROM

Recommended Citation:
Wang, QF,Zhang, TJ,Jin, HJ,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.
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