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• W3134501422 startingPage "146099" @default.
• W3134501422 abstract "Rivers are significant sources of CO2 to the atmosphere, and karstic watersheds are particularly important in this respect due to their large availability of inorganic carbon. This study examines characteristics of dissolved inorganic carbon (DIC) and excess partial pressures of CO2 (epCO2) in the source springs and headwaters of four watersheds in a Central European karstic region, via dissolved inorganic carbon concentration and stable carbon isotope measurements. Our results show the most 13C-depleted δ13CDIC values at the source springs, which become rapidly enriched downstream due to CO2 degassing. Concurrently, epCO2 values, while consistently in excess of atmospheric concentrations at the spring sources, show decreases of up to 92% within only 50 m downstream distance. In conjunction with the large observed flux estimates of up to 88 g C m−2 day−1, these findings suggest that karstic springs are major CO2 sources to the atmosphere. Because headwater streams constitute the bulk of the surface area of most watersheds, they may provide a disproportionately large contribution to CO2 effluxes in carbonate-dominated basins, in which source springs play a particularly important role." @default.
• W3134501422 created "2021-03-15" @default.
• W3134501422 creator A5044366967 @default.
• W3134501422 creator A5053172485 @default.
• W3134501422 creator A5057063323 @default.
• W3134501422 date "2021-07-01" @default.
• W3134501422 modified "2023-10-02" @default.
• W3134501422 title "Extreme gradients in CO2 losses downstream of karstic springs" @default.
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• W3134501422 doi "https://doi.org/10.1016/j.scitotenv.2021.146099" @default.
• W3134501422 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33714833" @default.
• W3134501422 hasPublicationYear "2021" @default.
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