Stable hydrogen and oxygen isotope composition of precipitation in Northeastern Colorado

Stable oxygen and hydrogen isotope values of archived precipitation samples from the National Atmospheric Deposition Program monitoring station in the Pawnee Grasslands, northeastern Colorado, were measured for the period 1994 98. The aim was the determine the local meteoric waterline and the local...

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Bibliographic Details
Published in:Journal of the American Water Resources Association 2005-04, Vol.41 (2), p.447-459
Main Author: Harvey, F.E
Format: Article
Language:English
Subjects:
chemical composition
deuterium
Earth sciences
Earth, ocean, space
environmental monitoring
Exact sciences and technology
Geochemistry
grasslands
groundwater
Hydrology. Hydrogeology
Isotope geochemistry
Isotope geochemistry. Geochronology
meteorology/climatology
Mineralogy
northeastern Colorado
oxygen
precipitation
semiarid zones
Silicates
stable isotopes
stable oxygen and hydrogen isotopes
surface water
Water geochemistry
Water resources
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Summary:Stable oxygen and hydrogen isotope values of archived precipitation samples from the National Atmospheric Deposition Program monitoring station in the Pawnee Grasslands, northeastern Colorado, were measured for the period 1994 98. The aim was the determine the local meteoric waterline and the local relationship between the oxygen ratios of precipitation and air temperature ( delta -T). The delta super(18)O and delta super(2)H analyses were made at the Environmental Isotope Laboratory at the University of Waterloo, ON, Canada. The isotopic attributes of the precipitation were found to be similar to those from other mid-continental regions, with a strong isotopic enrichment between winter and summer precipitation and a strong delta super(18)O T correlation. The local meteoric waterline, however, was slightly below the global meteoric waterline for heavier samples, and yearly delta super(18)O and delta super(2)H means were more depleted than those at nearby stations. The results were consistent with groundwater and surface-water isotope data in the region.
ISSN:1093-474X
1752-1688
DOI:10.1111/j.1752-1688.2005.tb03748.x