DOI: 10.1016/j.epsl.2021.117060
论文题名: Origin of water masses in Floridan Aquifer System revealed by 81Kr
作者: Yokochi R. ; Zappala J.C. ; Purtschert R. ; Mueller P.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 569 语种: 英语
中文关键词: coastal dolomitization
; Floridan Aquifer System
; fossil seawater
; groundwater dating
; radiokrypton isotopes
英文关键词: Aquifers
; Glacial geology
; Groundwater geochemistry
; Groundwater resources
; Hydrochemistry
; Hydrogeology
; Inert gases
; Information management
; Oceanography
; Recharging (underground waters)
; Seawater
; Water management
; Aquifer systems
; Coastal aquifers
; Coastal dolomitization
; Floridan aquifer system
; Fossil seawater
; Fresh Water
; Groundwater dating
; Radiokrypton isotope
; Salinisation
; Water mass
; Isotopes
; Florida
英文摘要: Groundwater in coastal aquifers serves as an essential resource in densely populated areas throughout the world. However, hydrological connection to the ocean leaves it at risk of salinization via changes in climate and hydrological cycles. Therefore, an accurate hydrological characterization of coastal aquifers is of the utmost importance. Although localized salinization of shallow aquifers has commonly been studied, geochemical constraints on the time scale of regional freshwater and seawater in coastal aquifers are limited especially in carbonate aquifers. Such information is not only crucial for water resource management, but also for understanding solute flux over the land-ocean boundary and for interpreting the geochemical signatures that each water mass carries. Toward this goal, we report tracer-based, subsurface residence times of groundwater in the Floridan Aquifer System in southern Florida, which is one of the most productive aquifers on Earth. The first application of 81Kr—an emerging tracer of old groundwater—to this aquifer has identified freshwater recharge during the last glacial period as anticipated from previous studies using other geochemical tools including radiocarbon, stable isotopes and noble gas concentrations. Moreover, freshwater of Holocene age was also detected at 100 km-distance from the recharge area, suggesting the possibility of an active flow system in the upgradient region. A contribution of fossil seawater that predates the last glacial maximum was locally identified, suggesting slow seawater circulation and limited but significant solute flux from the ocean into the aquifer for dolomitization. This also implies that the deep saline coastal groundwater can potentially serve as a paleo-seawater archive. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165735
Appears in Collections: 气候变化与战略
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作者单位: Department of the Geophysical Sciences, The University of ChicagoIL 60637, United States; Physics Division, Argonne National Laboratory, Lemont, IL 60439, United States; Climate and Environmental Physics, Physics Institute, the Oeschger Centre for Climate Change Research, University of Bern, Bern, 3012, Switzerland
Recommended Citation:
Yokochi R.,Zappala J.C.,Purtschert R.,et al. Origin of water masses in Floridan Aquifer System revealed by 81Kr[J]. Earth and Planetary Science Letters,2021-01-01,569