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首页> 外文期刊>Journal of the American Water Resources Association >STABLE HYDROGEN AND OXYGEN ISOTOPE COMPOSITION OF PRECIPITATION IN NORTHEASTERN COLORADO
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STABLE HYDROGEN AND OXYGEN ISOTOPE COMPOSITION OF PRECIPITATION IN NORTHEASTERN COLORADO

机译：东北科罗拉多州降水中氢和氧同位素的稳定组成

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摘要

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 δ~ (18)O_(precipitation)-T_(air) 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 (δ~(18)O) and deuterium δ~2H) 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 δ~(18)O and δ~2H 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 δ~2H = 7.86 δ~(18)O -7.66, and the data show a δ~(18)O_(weekly) - T_(weekly) relationship of δ~(18)O = 0.560 • T (℃) - 18.8.
机译：在有数据的地方，水文学研究可以使用降水的稳定的氧和氢同位素组成来研究水流，地下水/地表水的相互作用以及地下水的补给。古气候研究利用δ〜（18）O_（降水）-T_（空气）关系，例如与湖泊沉积物，化石或旧地下水结合，以估计古气温。生态学研究利用降水和土壤水同位素组成来跟踪植物中的水分吸收，并追踪物种的迁移模式。此类研究要求已知沉淀的同位素组成。在美国大平原中北部的半干旱地区，缺乏降水的氧18（δ〜（18）O）和氘δ〜2H）数据，因此有必要建立另外的大气水线作为整个区域的同位素输入功能，以及对控制降水中氧和氢同位素比的同位素气候联系的更好理解。本研究使用存档的国家大气沉积计划样本确定了1994年至1998年科罗拉多州东北部波尼草原的δ〜（18）O和δ〜2H降水组成。所得局部水线遵循关系δ〜2H = 7.86δ〜（18）O -7.66，数据显示δ〜（18）O_（每周）-T_（每周）关系为δ〜（18）O = 0.560•吨（℃）-18.8。

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