干旱区生态环境知识资源中心(Arid): delta C-13 and C-14 activity of groundwater DOC and DIC in the volcanically active and arid Loa Basin of northern Chile

Arid

DOI	10.1016/j.jhydrol.2021.125987
	delta C-13 and C-14 activity of groundwater DOC and DIC in the volcanically active and arid Loa Basin of northern Chile
	Godfrey, Linda, V; Herrera, Christian; Burr, George S.; Houston, John; Aguirre, Igor; Jordan, Teresa E.
通讯作者	Godfrey, LV (corresponding author), Rutgers State Univ, Dept Earth & Planetary Sci, Piscataway, NJ 08854 USA.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	595
英文摘要	Organic and inorganic carbon reservoirs are investigated in surface and groundwater in the semi to hyper-arid Rio Loa Basin in Northern Chile. Part of the study area is within the Andean volcanic arc, and volcanism is responsible for large inputs of C-14-depleted CO2 which hampers groundwater residence time estimations using dissolved inorganic carbon (DIC). To better understand the area's carbon system, we investigated C-14 and delta C-13 in dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) in groundwater and surface water. DOC concentrations are low in all water samples analyzed, 16-53 mu M. Fluorescence and delta C-13 measurements on DOC indicate that dissolved organic matter (DOM) entering groundwater has characteristics of humic compounds derived from terrestrial plants in the recharge area. Fluorescence is lost in groundwater in the lower part of the system due to microbial or abiotic degradation. Changes in C-14(DOC) and delta C-13(DOC) also indicate that microbial activity contributes to DOC, possibly from geogenic CO2. While the range of C-14(DIC) is very large, 1.6 to >50 pmC, that of C-14(DOC) is restricted between 53 and 72 pmC. We estimated C residence times in the volcanic arc, based on corrected C-14(DOC), are <3,200 years compared to C-14(DIC) estimates that range from 2,000 to 15,000 years. While uncertainties in the estimate due to sources and sinks of DOC within the different aquifers exist, the range in age is somewhat restricted, despite the large distances that separate different sampling points and the different types of aquifers sampled. This leads us to conclude that wetter climate conditions in the past increased recharge and storage of the aquifers, and DOC inputs to recharging water was enhanced by more widespread plant growth during those past wet climates.
英文关键词	Central Andes Dissolved organic carbon Dissolved inorganic carbon delta C-13 and C-14 Recharge Arid region
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000641592600039
WOS关键词	DISSOLVED ORGANIC-MATTER ; CENTRAL ATACAMA DESERT ; INORGANIC CARBON ; ISOTOPIC COMPOSITION ; RADIOCARBON ; EVOLUTION ; MODEL ; SEQUENCE ; DEPOSITS ; RECHARGE
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350886
作者单位	[Godfrey, Linda, V] Rutgers State Univ, Dept Earth & Planetary Sci, Piscataway, NJ 08854 USA; [Herrera, Christian] Univ Bernardo OHiggins, Ctr Invest & Desarrollo Ecosistemas Hidr, Santiago, Chile; [Burr, George S.] Univ Arizona, NSF Arizona AMS Lab, Tucson, AZ 85721 USA; [Houston, John] Rocklea, Dorchester DT2 9EN, England; [Aguirre, Igor] Subeterranea Consultores, Santiago, Chile; [Jordan, Teresa E.] Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA; [Burr, George S.] Natl Taiwan Univ, Dept Geosci, Taipei, Taiwan
推荐引用方式 GB/T 7714	Godfrey, Linda, V,Herrera, Christian,Burr, George S.,et al. delta C-13 and C-14 activity of groundwater DOC and DIC in the volcanically active and arid Loa Basin of northern Chile[J]. University of Arizona,2021,595.
APA	Godfrey, Linda, V,Herrera, Christian,Burr, George S.,Houston, John,Aguirre, Igor,&Jordan, Teresa E..(2021).delta C-13 and C-14 activity of groundwater DOC and DIC in the volcanically active and arid Loa Basin of northern Chile.JOURNAL OF HYDROLOGY,595.
MLA	Godfrey, Linda, V,et al."delta C-13 and C-14 activity of groundwater DOC and DIC in the volcanically active and arid Loa Basin of northern Chile".JOURNAL OF HYDROLOGY 595(2021).