气候变化领域集成服务门户(CCPortal): Isotopic and chromatographic fingerprinting of the sources of dissolved organic carbon in a shallow coastal aquifer

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DOI	10.5194/hess-24-2167-2020
	Isotopic and chromatographic fingerprinting of the sources of dissolved organic carbon in a shallow coastal aquifer
	T. Meredith K.; Baker A.; S. Andersen M.; M. O'Carroll D.; Rutlidge H.; K. McDonough L.; Oudone P.; Bryan E.; Syahiza Zainuddin N.
发表日期	2020
ISSN	1027-5606
起始页码	2167
结束页码	2178
卷号	24 期号:4
英文摘要	The terrestrial subsurface is the largest source of freshwater globally. The organic carbon contained within it and processes controlling its concentration remain largely unknown. The global median concentration of dissolved organic carbon (DOC) in groundwater is low compared to surface waters, suggesting significant processing in the subsurface. Yet the processes that remove this DOC in groundwater are not fully understood. The purpose of this study was to investigate the different sources and processes influencing DOC in a shallow anoxic coastal aquifer. Uniquely, this study combines liquid chromatography organic carbon detection with organic (13CDOC) carbon isotope geochemical analyses to fingerprint the various DOC sources that influence the concentration, carbon isotopic composition, and character with respect to distance from surface water sources, depth below surface, and inferred groundwater residence time (using 3H activities) in groundwater. It was found that the average groundwater DOC concentration was 5 times higher (5 mg Lo1) than the global median concentration and that the concentration doubled with depth at our site, but the chromatographic character did not change significantly. The anoxic saturated conditions of the aquifer limited the rate of organic matter processing, leading to enhanced preservation and storage of the DOC sources from peats and palaeosols contained within the aquifer. All groundwater samples were more aromatic for their molecular weight in comparison to other lakes, rivers and surface marine samples studied. The destabilization or changes in hydrology, whether by anthropogenic or natural processes, could lead to the flux of up to 10 times more unreacted organic carbon from this coastal aquifer compared to deeper inland aquifers. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	Analytical geochemistry; Anoxic water; Aquifers; Groundwater resources; Hydrogeology; Isotopes; Liquid chromatography; Stream flow; Surface waters; Carbon isotopic composition; Chromatographic fingerprinting; Dissolved organic carbon; Groundwater residence time; Median concentration; Organic carbon detection; Organic matter processing; Surface water sources; Organic carbon; aquifer pollution; carbon isotope; coastal aquifer; concentration (composition); detection method; dissolved organic carbon; geochemical method; hydrology; paleosol; shallow water
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159421
作者单位	T. Meredith, K., Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia, Connected Waters Initiative Research Centre, UNSW Sydney, High St., Kensington, NSW 2052, Australia; Baker, A., Connected Waters Initiative Research Centre, UNSW Sydney, High St., Kensington, NSW 2052, Australia, School of Biological, Earth and Environmental Sciences, UNSW Sydney, High St., Kensington, NSW 2052, Australia; S. Andersen, M., Connected Waters Initiative Research Centre, UNSW Sydney, High St., Kensington, NSW 2052, Australia, School of Civil and Environmental Engineering, UNSW Sydney, High St., Kensington, NSW 2052, Australia; M. O'Carroll, D., Connected Waters Initiative Research Centre, UNSW Sydney, High St., Kensington, NSW 2052, Australia, School of Civil and Environmental Engineering, UNSW Sydney, High St., Kensington, NSW 2052, Australia; Rutlidge, H., Connected Waters Initiative Research Centre, UNSW Sydney, High St., Kensington, NSW 2052, Australia, School of Civil and...
推荐引用方式 GB/T 7714	T. Meredith K.,Baker A.,S. Andersen M.,et al. Isotopic and chromatographic fingerprinting of the sources of dissolved organic carbon in a shallow coastal aquifer[J],2020,24(4).
APA	T. Meredith K..,Baker A..,S. Andersen M..,M. O'Carroll D..,Rutlidge H..,...&Syahiza Zainuddin N..(2020).Isotopic and chromatographic fingerprinting of the sources of dissolved organic carbon in a shallow coastal aquifer.Hydrology and Earth System Sciences,24(4).
MLA	T. Meredith K.,et al."Isotopic and chromatographic fingerprinting of the sources of dissolved organic carbon in a shallow coastal aquifer".Hydrology and Earth System Sciences 24.4(2020).