Fig. 2 | Nature Communications

Fig. 2

From: Unexpected large evasion fluxes of carbon dioxide from turbulent streams draining the world’s mountains

Fig. 2

Sources of CO2 in streams in the Swiss Alps. a Estimated groundwater pCO2 in Swiss mountain catchments. b Isotopic compositions of dissolved inorganic carbon (δ13C-DIC) indicates biogenic (e.g., soil respiration) as well as geogenic sources (more enriched) (‰ Vienna Pee Dee Belemnite, VPDB). End-members are adopted from refs. 37,38. The box plot shows median and quartile δ13C-DIC compositions repeatedly sampled across the 12 Swiss sites (n = 134; 7–15 samples per stream) (calculated in JMP 13, SAS Institute Inc., USA)

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