Water balance model for mean annual hydrogen and oxygen isotope distributions in surface waters of the contiguous United States

被引:67
作者
Bowen, Gabriel J. [1 ,2 ]
Kennedy, Casey D. [1 ]
Liu, Zhongfang [1 ]
Stalker, Jeremy [1 ]
机构
[1] Purdue Univ, Dept Earth & Atmospher Sci, W Lafayette, IN 47907 USA
[2] Purdue Univ, Purdue Climate Change Res Ctr, W Lafayette, IN 47907 USA
基金
美国国家科学基金会;
关键词
RIVER WATER; MODERN PRECIPITATION; STABLE HYDROGEN; COLORADO RIVER; EVAPORATION; BASIN; HAIR; GROUNDWATERS; DEUTERIUM; ORIGIN;
D O I
10.1029/2010JG001581
中图分类号
X [环境科学、安全科学];
学科分类号
083001 [环境科学];
摘要
The stable H and O isotope composition of river and stream water records information on runoff sources and land-atmosphere water fluxes within the catchment and is a potentially powerful tool for network-based monitoring of ecohydrological systems. Process-based hydrological models, however, have thus far shown limited power to replicate observed large-scale variation in U. S. surface water isotope ratios. Here we develop a geographic information system-based model to predict long-term annual average surface water isotope ratios across the contiguous United States. We use elevation-explicit, gridded precipitation isotope maps as model input and data from a U. S. Geological Survey monitoring program for validation. We find that models incorporating monthly variation in precipitation-evapotranspiration (P-E) amounts account for the majority (> 89%) of isotopic variation and have reduced regional bias relative to models that do not consider intra-annual P-E effects on catchment water balance. Residuals from the water balance model exhibit strong spatial patterning and correlations that suggest model residuals isolate additional hydrological signal. We use interpolated model residuals to generate optimized prediction maps for U. S. surface water delta H-2 and delta O-18 values. We show that the modeled surface water values represent a relatively accurate and unbiased proxy for drinking water isotope ratios across the United States, making these data products useful in ecological and criminal forensics applications that require estimates of the local environmental water isotope variation across large geographic regions.
引用
收藏
页数:14
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