Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR019655 |
Steady state fractionation of heavy noble gas isotopes in a deep unsaturated zone | |
Seltzer, Alan M.1; Severinghaus, Jeffrey P.1; Andraski, Brian J.2; Stonestrom, David A.3 | |
2017-04-01 | |
发表期刊 | WATER RESOURCES RESEARCH
![]() |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | To explore steady state fractionation processes in the unsaturated zone (UZ), we measured argon, krypton, and xenon isotope ratios throughout a similar to 110 m deep UZ at the United States Geological Survey (USGS) Amargosa Desert Research Site (ADRS) in Nevada, USA. Prior work has suggested that gravitational settling should create a nearly linear increase in heavy-to-light isotope ratios toward the bottom of stagnant air columns in porous media. Our high-precision measurements revealed a binary mixture between (1) expected steady state isotopic compositions and (2) unfractionated atmospheric air. We hypothesize that the presence of an unsealed pipe connecting the surface to the water table allowed for direct inflow of surface air in response to extensive UZ gas sampling prior to our first (2015) measurements. Observed isotopic resettling in deep UZ samples collected a year later, after sealing the pipe, supports this interpretation. Data and modeling each suggest that the strong influence of gravitational settling and weaker influences of thermal diffusion and fluxes of CO2 and water vapor accurately describe steady state isotopic fractionation of argon, krypton, and xenon within the UZ. The data confirm that heavy noble gas isotopes are sensitive indicators of UZ depth. Based on this finding, we outline a potential inverse approach to quantify past water table depths from noble gas isotope measurements in paleogroundwater, after accounting for fractionation during dissolution of UZ air and bubbles. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403682600013 |
WOS关键词 | AIR ; DIFFUSION ; WATER ; SOIL ; PARAMETERS ; TRANSPORT ; NE |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21467 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Calif San Diego, Scripps Inst Oceanog, San Diego, CA 92103 USA; 2.US Geol Survey, Carson City, NV USA; 3.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA |
推荐引用方式 GB/T 7714 | Seltzer, Alan M.,Severinghaus, Jeffrey P.,Andraski, Brian J.,et al. Steady state fractionation of heavy noble gas isotopes in a deep unsaturated zone[J]. WATER RESOURCES RESEARCH,2017,53(4). |
APA | Seltzer, Alan M.,Severinghaus, Jeffrey P.,Andraski, Brian J.,&Stonestrom, David A..(2017).Steady state fractionation of heavy noble gas isotopes in a deep unsaturated zone.WATER RESOURCES RESEARCH,53(4). |
MLA | Seltzer, Alan M.,et al."Steady state fractionation of heavy noble gas isotopes in a deep unsaturated zone".WATER RESOURCES RESEARCH 53.4(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论