气候变化领域集成服务门户(CCPortal): Offshore Freshened Groundwater in Continental Margins

CCPortal

DOI	10.1029/2020RG000706
	Offshore Freshened Groundwater in Continental Margins
	Micallef A.; Person M.; Berndt C.; Bertoni C.; Cohen D.; Dugan B.; Evans R.; Haroon A.; Hensen C.; Jegen M.; Key K.; Kooi H.; Liebetrau V.; Lofi J.; Mailloux B.J.; Martin-Nagle R.; Michael H.A.; Müller T.; Schmidt M.; Schwalenberg K.; Trembath-Reichert E.; Weymer B.; Zhang Y.; Thomas A.T.
发表日期	2021
ISSN	87551209
卷号	59 期号:1
英文摘要	First reported in the 1960s, offshore freshened groundwater (OFG) has now been documented in most continental margins around the world. In this review we compile a database documenting OFG occurrences and analyze it to establish the general characteristics and controlling factors. We also assess methods used to map and characterize OFG, identify major knowledge gaps, and propose strategies to address them. OFG has a global volume of 1 × 106 km3; it predominantly occurs within 55 km of the coast and down to a water depth of 100 m. OFG is mainly hosted within siliciclastic aquifers on passive margins and recharged by meteoric water during Pleistocene sea level lowstands. Key factors influencing OFG distribution are topography-driven flow, salinization via haline convection, permeability contrasts, and the continuity/connectivity of permeable and confining strata. Geochemical and stable isotope measurements of pore waters from boreholes have provided insights into OFG emplacement mechanisms, while recent advances in seismic reflection profiling, electromagnetic surveying, and numerical models have improved our understanding of OFG geometry and controls. Key knowledge gaps, such as the extent and function of OFG, and the timing of their emplacement, can be addressed by the application of isotopic age tracers, joint inversion of electromagnetic and seismic reflection data, and development of three-dimensional hydrological models. We show that such advances, combined with site-specific modeling, are necessary to assess the potential use of OFG as an unconventional source of water and its role in sub-seafloor geomicrobiology. © 2020. The Authors.
英文关键词	continental margin; geochemistry; geophysics; marine hydrogeology; modeling; offshore freshened groundwater
语种	英语
来源期刊	Reviews of Geophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/188067
作者单位	Helmholtz Centre for Ocean Research, GEOMAR, Kiel, Germany; Marine Geology and Seafloor Surveying, Department of Geosciences, University of Malta, Msida, Malta; Hydrology Program, New Mexico Institute of Mining and Technology, Socorro, NM, United States; Department of Earth Science, University of Oxford, Oxford, United Kingdom; Department of Geophysics, School of Mines, Golden, CO, United States; Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; Deltares Research Institute, Utrecht, Netherlands; University of Montpellier, CNRS, University of the Antilles, Montpellier, France; Barnard College, Columbia University, New York, NY, United States; A Ripple Effect, Rockville, MD, United States; Departments of Earth Sciences and Civil and Environmental Engineering, University of Delaware, Newark, DE, United States; Helmholtz Centre for Environmental Research, UFZ, Leipzig, Germany; Federa...
推荐引用方式 GB/T 7714	Micallef A.,Person M.,Berndt C.,et al. Offshore Freshened Groundwater in Continental Margins[J],2021,59(1).
APA	Micallef A..,Person M..,Berndt C..,Bertoni C..,Cohen D..,...&Thomas A.T..(2021).Offshore Freshened Groundwater in Continental Margins.Reviews of Geophysics,59(1).
MLA	Micallef A.,et al."Offshore Freshened Groundwater in Continental Margins".Reviews of Geophysics 59.1(2021).