Isotopic studies of the Upper and Middle Rio Grande. Part 2 — Salt loads and human impacts in south New Mexico and west Texas
作者： Anna Szynkiewicz , David M. Borrok , Girisha K. Ganjegunte , Grzegorz Skrzypek , Lin Ma
DOI: 10.1016/J.CHEMGEO.2015.05.023
关键词: Hydrology 、 Isotopes of oxygen 、 Soil water 、 δ18O 、 δ34S 、 Groundwater 、 Soil salinity 、 Salinity 、 Geology 、 Water table
摘要: Abstract Increasing groundwater and soil salinity is a threat to the land water resources in arid regions. Global warming will likely increase of dryland river systems. In order characterize salt loading into semi-arid portion Rio Grande south New Mexico west Texas, we sampled seasonally (2009–2011) river, agricultural drains, saline groundwater. addition major element chemistry, these samples were analyzed for sulfur oxygen isotope compositions (δ34S δ18O) dissolved SO4 some cases nitrogen (δ15N NO3. Uranium isotopes (234U/238U activity ratio) also measured selected samples. The natural inflow basinal brines/groundwater + 8 + 11‰) study area was minor investigated seasons could not be detected by δ34S mass balance. However, did find localized increases (+ 2 + 5‰) that attributable loads from intersections drains with table flat associated evaporative brine + 12‰) shallow subsurface. areas, higher use irrigation, drain relatively consistent (from ~ 0 + 2‰) compared δ18O ~+ 2 + 6‰). Most likely, this resulted application S-rich fertilizers (e.g., ammonium sulfates, elemental S, sulfuric acid) low (− 2 + 4‰) high (+ 9 + 16‰). Additionally, observed considerably lower (SO4) (
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