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DOI	10.1016/j.catena.2023.107112
	Impacts of climate change and freeze-thaw cycles on water and sediment fluxes in the headwater region of the Yangtze River, Qinghai-Tibet Plateau
	Li, Jinlong; Wang, Genxu; Li, Kai; Li, Yang; Guo, Linmao; Song, Chunlin
发表日期	2023
ISSN	0341-8162
EISSN	1872-6887
卷号	227
英文摘要	Variations in the suspended sediment on the Qinghai-Tibet Plateau have important implications for aquatic ecosystems. Although changes in the cryosphere induced by climate change have been shown to increase sedi-ment yields, their impacts on water and sediment dynamics in headwater regions remain poorly investigated. Here, we examined the responses of runoff and suspended sediment dynamics to changes in the climate and ground freeze-thaw cycle in the source region of the Yangtze River (SRYR) from 1964 to 2019. Long-term daily in situ water and sediment observations provided evidence that climate change controlled change in seasonal and annual water-sediment dynamics by regulating air temperature and precipitation. Attribution analysis showed that precipitation (-41.93 %, through driving rainfall splash, overland flow erosion, and mass wasting) and land surface temperature (-30.66 %, through driving freeze-thaw erosion) were the major factors contributing to increasing fluvial sediment fluxes over the past 30 years. We found that freeze-thaw cycles changed the soil erosion patterns by governing the thermal state of the near-surface active layer and driving associated thermal processes. Furthermore, the extension of the thawing duration and the advance of the thawing starting date (at an average rate of 13.5 days/10 yr) exacerbated freeze-thaw erosion, leading to elevated sediment fluxes in the initial thaw and initial freezing periods. This study highlights the need to focus on cryosphere-hydrology ob-servations in terms of sediment dynamics; these findings are critical for soil and ecological protection in alpine headwater regions.
关键词	Sediment dynamics Freeze -thaw cycle Climate change Qinghai -Tibet Plateau
英文关键词	3 GORGES DAM; RUNOFF; PERMAFROST; SNOW; LAND; ICE; TEMPERATURE; CATCHMENTS; DYNAMICS; PATTERNS
WOS研究方向	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS记录号	WOS:000973173900001
来源期刊	CATENA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282909
作者单位	Sichuan University
推荐引用方式 GB/T 7714	Li, Jinlong,Wang, Genxu,Li, Kai,et al. Impacts of climate change and freeze-thaw cycles on water and sediment fluxes in the headwater region of the Yangtze River, Qinghai-Tibet Plateau[J],2023,227.
APA	Li, Jinlong,Wang, Genxu,Li, Kai,Li, Yang,Guo, Linmao,&Song, Chunlin.(2023).Impacts of climate change and freeze-thaw cycles on water and sediment fluxes in the headwater region of the Yangtze River, Qinghai-Tibet Plateau.CATENA,227.
MLA	Li, Jinlong,et al."Impacts of climate change and freeze-thaw cycles on water and sediment fluxes in the headwater region of the Yangtze River, Qinghai-Tibet Plateau".CATENA 227(2023).