Journal Publications
نویسنده
چکیده
The evasion of carbon dioxide from inland waters was only recently included in assessments of the global carbon budget1,2. Current estimates of carbon dioxide release from global freshwater systems, including lakes and wetlands, range from 0.7 to 3.3 Pg C per year1,3-6. However, these estimates are based on incomplete spatial coverage of carbon dioxide evasion, and an inadequate understanding of the factors controlling the efflux of carbon dioxide across large drainage networks5. Here, we estimate the amount of carbon degassed from streams and rivers in the United States using measurements of temperature, alkalinity and pH, together with high resolution data on the morphology and surface area of these waterways. We show that streams and rivers in the United States are super-saturated with carbon dioxide compared to the atmosphere, emitting 97 ± 32 Tg carbon each year. We further show that regionally, carbon dioxide evasion from streams and rivers is positively correlated with annual precipitation, which we attribute to climatic regulation of stream surface area and the flushing of carbon dioxide from soils. Scaling our analysis from the U.S. to temperate rivers between 25°N and 50°N we estimate a release of around 0.5 Pg carbon to the atmosphere each year.
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Global Health: A Review of Concepts, Players, and Publications
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