干旱区生态环境知识资源中心(Arid): Spatial variations and controls on the hydrochemistry of surface waters across the Ili-Balkhash Basin, arid Central Asia

Arid

DOI	10.1016/j.jhydrol.2021.126565
	Spatial variations and controls on the hydrochemistry of surface waters across the Ili-Balkhash Basin, arid Central Asia
	Shen, Beibei; Wu, Jinglu; Zhan, Shuie; Jin, Miao; Saparov, A. S.; Abuduwaili, Jilili
通讯作者	Wu, JL (corresponding author), Chinese Acad Sci, Nanjing Inst Geog & Limnol, 73 East Beijing Rd, Nanjing 210008, Peoples R China.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	600
英文摘要	Climate variability influences both water quantity and quality in lakes and rivers, e.g., shifts in salinity caused by changes in the evaporation/precipitation ratio. However, knowledge about climate and human influences on water quality in some regions is scarce, which causes uncertainty when evaluating water resources and developing water management plans. We measured the chemical composition and stable isotope values (delta D and delta O-18) in water samples from the Ili-Balkhash Basin, arid Central Asia, to investigate factors that control hydrologic processes in the area, and explore how the arid environment influences local hydrochemistry and water resources. Isotope values in lake waters (-24.1 parts per thousand ioDi and -1.5 parts per thousand [delta O-18]) are enriched relative to river waters (-84.6 parts per thousand [delta D] and -12.4 parts per thousand [delta O-18]), indicating that lake waters experience intense evaporation. In the upstream Ili River, waters with lowest delta D and delta O-18 values are supplied mainly by glacial ice and snow melt, whereas lower reaches of the river are affected increasingly by evaporation and human water extraction. Waters of the Ili River and other small rivers that drain to Lake Balkhash are chemically similar, and of the Ca-HCO3 type. Gibbs diagrams indicate that mineral weathering is the key process that controls river water chemistry. On average, carbonate and silicate weathering contribute 55.1% and 26.7%, respectively, to the total dissolved ion load in the river waters, illustrating the strong control that regional geology exerts on streamwater chemistry. In contrast, lake waters are characterized as Na-Cl type, which results mainly from evaporation and some evaporite dissolution. Weathering in the area is controlled by climate, i.e. precipitation and temperature. Moreover, a negative correlation between lake water total dissolved solids and d-excess, and a systematic increase in chemical concentrations and stable isotope values downstream in the Ili River, reflect the fact that arid climate conditions promote evaporation and affect water quality. PCA analysis and mass balance calculation of water chemistry suggests that humans contribute only 6.6% of the major ion load to waters, which display increasing concentrations in the middle and downstream regions. There, effects of human-mediated weathering and transport of salts from agricultural irrigation are reinforced by higher temperatures and evaporation.
英文关键词	Ili-Balkhash Basin Arid Central Asia Hydrochemistry Climate effects Anthropogenic impact
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000685246900057
WOS关键词	TARIM RIVER-BASIN ; CO2 CONSUMPTION ; STABLE-ISOTOPES ; GROUNDWATER ; CLIMATE ; SYSTEM ; PRECIPITATION ; GEOCHEMISTRY ; CHEMISTRY
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368484
作者单位	[Shen, Beibei] Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou 225127, Jiangsu, Peoples R China; [Wu, Jinglu; Zhan, Shuie; Jin, Miao] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China; [Wu, Jinglu; Saparov, A. S.; Abuduwaili, Jilili] Chinese Acad Sci, Res Ctr Ecol & Environm Cent Asia, Urumqi 830011, Peoples R China
推荐引用方式 GB/T 7714	Shen, Beibei,Wu, Jinglu,Zhan, Shuie,et al. Spatial variations and controls on the hydrochemistry of surface waters across the Ili-Balkhash Basin, arid Central Asia[J],2021,600.
APA	Shen, Beibei,Wu, Jinglu,Zhan, Shuie,Jin, Miao,Saparov, A. S.,&Abuduwaili, Jilili.(2021).Spatial variations and controls on the hydrochemistry of surface waters across the Ili-Balkhash Basin, arid Central Asia.JOURNAL OF HYDROLOGY,600.
MLA	Shen, Beibei,et al."Spatial variations and controls on the hydrochemistry of surface waters across the Ili-Balkhash Basin, arid Central Asia".JOURNAL OF HYDROLOGY 600(2021).