干旱区生态环境知识资源中心(Arid): A review of the use of radiocarbon to estimate groundwater residence times in semi-arid and arid areas

Arid

DOI	10.1016/j.jhydrol.2019.124247
	A review of the use of radiocarbon to estimate groundwater residence times in semi-arid and arid areas
	Cartwright, Ian 1; Currell, Matthew J.2; Cendon, Dioni, I 3; Meredith, Karina T.3
通讯作者	Cartwright, Ian
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	580
英文摘要	Groundwater is an important resource in arid and semi-arid regions and determining its residence times is critical for sustainable use. Radiocarbon (C-14) is currently the primary geochemical tracer for determining residence times of regional groundwater systems. The analysis of C-14 contents of dissolved inorganic carbon (DIC) became more straightforward following the development of accelerator mass spectrometry, which has led to an increase in the number of studies using C-14. However, the interpretation of C-14 data is not always straightforward and many studies consider relatively few of the multiple processes that may affect the C-14 contents of DIC in groundwater. Commonly, studies have focussed on correcting C-14 contents for closed-system dissolution of C-14-free calcite, which is a near-ubiquitous process. However, especially in semi-arid and arid areas, uncertainties in the initial C-14 contents and delta C-13 values of recharge due to the presence of low( 14)C soil CO2 in the deep unsaturated zone, recharge by rivers, or open-system calcite dissolution pose problems for mass balance calculations. Additionally, processes such as methanogenesis and mineralisation of organic carbon may be locally important. Most studies also assume a constant atmospheric C-14 content and non-dispersive piston flow in aquifers, which results in residence times being underestimated and makes it difficult to compare the groundwater archive to other palaeoclimate or palaeoenvironment records. Additionally, mixing of water within aquifers, diffusion of C-14 between low and high permeability layers, and sampling from multiple units in long-screen wells may limit whether a meaningful residence time can be determined. Overall, while it is relatively straightforward to estimate broad ranges of residence times or determine general patterns of groundwater flow, the quest to quantify residence times, flow rates, and recharge remains a challenge. The use of multiple radioactive tracers, better characterisation of delta C-13 values and C-14 contents of the potential sources of DIC, and more critical assessment of flow systems will improve the utilisation of this important tracer.
英文关键词	Radiocarbon Groundwater Residence times Ages Semi-arid Arid
类型	Review
语种	英语
国家	Australia
收录类别	SCI-E
WOS记录号	WOS:000509620900009
WOS关键词	CARBON-ISOTOPE DISCRIMINATION ; DISSOLVED INORGANIC CARBON ; YOUNG WATER FRACTIONS ; MEAN TRANSIT TIMES ; UNSATURATED ZONE ; PEDOGENIC CARBONATE ; STABLE-ISOTOPE ; MURRAY BASIN ; C-14 AGE ; ENVIRONMENTAL TRACERS
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/2XILL650/314980
作者单位	1.Monash Univ, Sch Earth Atmosphere & Environm, Clayton, Vic 3800, Australia; 2.RMIT Univ, Sch Engn, Melbourne, Vic 3000, Australia; 3.Australian Nucl Sci & Technol Org, Inst Environm Res, Kirrawee Dc, NSW 2232, Australia
推荐引用方式 GB/T 7714	Cartwright, Ian,Currell, Matthew J.,Cendon, Dioni, I,et al. A review of the use of radiocarbon to estimate groundwater residence times in semi-arid and arid areas[J],2020,580.
APA	Cartwright, Ian,Currell, Matthew J.,Cendon, Dioni, I,&Meredith, Karina T..(2020).A review of the use of radiocarbon to estimate groundwater residence times in semi-arid and arid areas.JOURNAL OF HYDROLOGY,580.
MLA	Cartwright, Ian,et al."A review of the use of radiocarbon to estimate groundwater residence times in semi-arid and arid areas".JOURNAL OF HYDROLOGY 580(2020).