ISSN:
1752-1688
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Architektur, Bauingenieurwesen, Vermessung
,
Geographie
Notizen:
: Where data are available, hydrologic studies may use precipitation's stable oxygen and hydrogen isotope composition to investigate streamflow, ground water/surface water interaction, and ground water recharge. Paleoclimate studies utilize the δ18Oprecipitation-Tair relationship, in conjunction with lake sediments, fossils, or old ground waters, for example, to estimate pale-otemperatures. Ecological studies utilize precipitation and soil water isotope composition to track moisture uptake in plants, and to trace species migration patterns. Such studies require that the isotopic composition of precipitation be known. Oxygen-18 (δ18O) and deuterium (δ2H) data for precipitation are lacking in the semi-arid portion of the north-central U.S. Great Plains, and thus there is a need to establish additional meteoric water lines as isotope input functions across the region, as well as to develop better understanding of the isotopic climate linkages that control oxygen and hydrogen isotope ratios in precipitation. This study determined the δ18O and δ2H composition of precipitation in the Pawnee Grasslands of northeastern Colorado from 1994 through 1998 using archived National Atmospheric Deposition Program samples. The resulting local water line follows the relationship δ2H = 7.86 δ18O-7.66, and the data show a δ18Oweekly - Tweekly relationship of δ18O = 0.560-T (°C)-18.8.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1752-1688.2005.tb03748.x
