干旱区生态环境知识资源中心(Arid): Large-scale paleo water-table rise in a deep desert aquifer recorded by dissolved noble gases

Arid

DOI	10.1016/j.jhydrol.2022.128114
	Large-scale paleo water-table rise in a deep desert aquifer recorded by dissolved noble gases
	Ram, Roi; Solomon, D. Kip; Yokochi, Reika; Burg, Avihu; Purtschert, Roland; Seltzer, Alan M.; Yechieli, Yoseph; Zappala, Jake C.; Lu, Zheng-Tian; Jiang, Wei; Mueller, Peter; Adar, Eilon M.
通讯作者	Ram, R
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2022
卷号	612
英文摘要	Illuminating past hydrological and climatological conditions in arid regions may provide insights into future trends in groundwater availability. The main objective of this study is to explore paleorecharge processes in the deep regional Nubian Sandstone Aquifer (NSA), which stretches below the hyperarid deserts of the Sinai Peninsula (Egypt) and the Negev (Israel), using dissolved noble gas data. Extremely high amounts of dissolved excess air (Ne concentrations up to 4 x solubility equilibrium) were observed in the ancient (Kr-81-depleted) groundwater that was recharged during past pluvial epochs in the basin. The observed unique excess air signal and the clear spatiotemporal structure of the noble gas compositions in the aquifer are hypothesized to reflect two major characteristics of the groundwater system: (a) large-scale, long-term rises in the water table that facilitate the entrapment and dissolution of air bubbles under increased hydrostatic pressure, and (b) the geological settings in the southern recharge area in Sinai, including an almost horizontal position of the layers and intercalation of low-permeability rock formations within the aquifer, which inefficiently reject air bubbles from groundwater, thereby allowing for substantial entrapment of bubbles that dissolve as the water table rises. Enhanced dissolution of entrapped air was also observed in other paleo-groundwater-containing regional sandstone aquifers across North Africa, which, together with the recent findings from the NSA, suggest that large-scale water table fluctuations have likely extensively occurred during past pluvial periods over these (and possibly other) arid regions. A preliminary assessment of noble gas recharge temperatures (NGTs) indicates an apparent decoupling of surface and water table temperatures in the case of deep aquifers with a thick (hundreds of m) unsaturated zone. This observed decoupling calls for a re-evaluation of previously obtained NGT records and a need for future work to consider the modification of NGTs due to soil air fractionation and geothermal heating of the underlying deep unsaturated zones.
英文关键词	Paleohydrology Excess air Paleoclimate Nubian Sandstone Aquifer Hydrogeology Recharge temperature
类型	Article
语种	英语
开放获取类型	Bronze, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000914172000003
WOS关键词	GREAT ARTESIAN BASIN ; CONTINENTAL INTERCALAIRE AQUIFER ; IN-GROUND WATER ; EXCESS AIR ; LATE PLEISTOCENE ; FOSSIL AQUIFERS ; STABLE-ISOTOPE ; NEGEV DESERT ; RIFT-VALLEY ; SINAI
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/2XILL650/393497
推荐引用方式 GB/T 7714	Ram, Roi,Solomon, D. Kip,Yokochi, Reika,et al. Large-scale paleo water-table rise in a deep desert aquifer recorded by dissolved noble gases[J],2022,612.
APA	Ram, Roi.,Solomon, D. Kip.,Yokochi, Reika.,Burg, Avihu.,Purtschert, Roland.,...&Adar, Eilon M..(2022).Large-scale paleo water-table rise in a deep desert aquifer recorded by dissolved noble gases.JOURNAL OF HYDROLOGY,612.
MLA	Ram, Roi,et al."Large-scale paleo water-table rise in a deep desert aquifer recorded by dissolved noble gases".JOURNAL OF HYDROLOGY 612(2022).