globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2636
论文题名:
Substantial proportion of global streamflow less than three months old
作者: Jasechko S.; Kirchner J.W.; Welker J.M.; McDonnell J.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:2
起始页码: 126
结束页码: 129
语种: 英语
Scopus关键词: aquifer ; biogeochemical cycle ; catchment ; chemical weathering ; groundwater flow ; infiltration ; oxygen isotope ratio ; pollutant transport ; precipitation intensity ; river discharge ; seasonal variation ; snow ; streamflow ; travel time ; water quality ; watershed
英文摘要: Biogeochemical cycles, contaminant transport and chemical weathering are regulated by the speed at which precipitation travels through landscapes and reaches streams. Streamflow is a mixture of young and old precipitation, but the global proportions of these young and old components are not known. Here we analyse seasonal cycles of oxygen isotope ratios in rain, snow and streamflow compiled from 254 watersheds around the world, and calculate the fraction of streamflow that is derived from precipitation that fell within the past two or three months. This young streamflow accounts for about a third of global river discharge, and comprises at least 5% of discharge in about 90% of the catchments we investigated. We conclude that, although typical catchments have mean transit times of years or even decades, they nonetheless can rapidly transmit substantial fractions of soluble contaminant inputs to streams. Young streamflow is less prevalent in steeper landscapes, which suggests they are characterized by deeper vertical infiltration. Because young streamflow is derived from less than 0.1% of global groundwater storage, we conclude that this thin veneer of aquifer storage will have a disproportionate influence on stream water quality. © 2016 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106082
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Geography, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada; Department of Environmental System Sciences, ETH Zürich, Universitätstrasse 16, Zürich, Switzerland; Swiss Federal Research Institute, Zürcherstrasse 111, Birmensdorf, Switzerland; Department of Earth and Planetary Science, University of California, 307 McCone Hall, Berkeley, CA, United States; Department of Biological Sciences, University of Alaska Anchorage, 3211 Providence Drive, Anchorage, AK, United States; Global Institute ForWater Security, School of Environment and Sustainability, University of Saskatchewan, 11 Innovation Boulevard, Saskatoon, SK, Canada; School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom; Department for Forest Engineering, Resources and Management, Oregon State University, Corvallis, OR, United States

Recommended Citation:
Jasechko S.,Kirchner J.W.,Welker J.M.,et al. Substantial proportion of global streamflow less than three months old[J]. Nature Geoscience,2016-01-01,9(2)
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