干旱区生态环境知识资源中心(Arid): Origin and chemical and isotopic evolution of dissolved inorganic carbon (DIC) in groundwater of the Okavango Delta, Botswana

Arid

DOI	10.1080/02626667.2018.1560447
	Origin and chemical and isotopic evolution of dissolved inorganic carbon (DIC) in groundwater of the Okavango Delta, Botswana
	Akondi, Rawlings N.1; Atekwana, Eliot A.2; Molwalefhe, Loago 3
通讯作者	Atekwana, Eliot A.
来源期刊	HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
ISSN	0262-6667
EISSN	2150-3435
出版年	2019
卷号	64 期号:1 页码:105-120
英文摘要	The origin and the chemical and isotopic evolution of dissolved inorganic carbon (DIC) in groundwater of the Okavango Delta in semi-arid Botswana were investigated using DIC and major ion concentrations and stable oxygen, hydrogen and carbon isotopes (delta D, delta O-18 and delta C-13(DIC)). The delta D and delta O-18 indicated that groundwater was recharged by evaporated river water and unevaporated rain. The river water and shallow (<10 m) groundwater are Ca-Na-HCO3 type and the deep (>= 10 m) groundwater is Na-K-HCO3 to HCO3-Cl-SO4 to Cl-SO4-HCO3. Compared to river water, the mean DIC concentrations were 2 times higher in shallow groundwater, 7 times higher in deep groundwater and 24 times higher in island groundwater. The delta C-13(DIC) indicate that DIC production in groundwater is from organic matter oxidation and in island groundwater from organic matter oxidation and dissolution of sodium carbonate salts. The ionic and isotopic evolution of the groundwater relative to evaporated river water indicates two independent pools of DIC.
英文关键词	carbon cycling groundwater evolution dissolved inorganic carbon stable isotopes arid environment Okavango Delta
类型	Article
语种	英语
国家	USA ; Botswana
收录类别	SCI-E
WOS记录号	WOS:000458977900008
WOS关键词	SEASONAL FLOODPLAIN ; DISTAL REACHES ; WATER-BALANCE ; RIVER-BASIN ; RIFT-ZONE ; KALAHARI ; SEDIMENTATION ; GEOCHEMISTRY ; ISLANDS ; FAN
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216195
作者单位	1.West Virginia Univ, Dept Geol & Geog, Morgantown, WV 26506 USA; 2.Univ Delaware, Dept Geol Sci, Newark, DE 19716 USA; 3.Botswana Int Univ Sci & Technol, Dept Earth & Environm Sci, Palapye, Botswana
推荐引用方式 GB/T 7714	Akondi, Rawlings N.,Atekwana, Eliot A.,Molwalefhe, Loago. Origin and chemical and isotopic evolution of dissolved inorganic carbon (DIC) in groundwater of the Okavango Delta, Botswana[J],2019,64(1):105-120.
APA	Akondi, Rawlings N.,Atekwana, Eliot A.,&Molwalefhe, Loago.(2019).Origin and chemical and isotopic evolution of dissolved inorganic carbon (DIC) in groundwater of the Okavango Delta, Botswana.HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES,64(1),105-120.
MLA	Akondi, Rawlings N.,et al."Origin and chemical and isotopic evolution of dissolved inorganic carbon (DIC) in groundwater of the Okavango Delta, Botswana".HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES 64.1(2019):105-120.