caa a22 4500 605517517 CHVBK 20210128100720.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s10533-015-0137-9 doi (NATIONALLICENCE)springer-10.1007/s10533-015-0137-9 Fluvial radiocarbon and its temporal variability during contrasting hydrological conditions [Elektronische Daten] [Jörg Tittel, Christin Müller, Martin Schultze, Andreas Musolff, Kay Knöller] To study the significance of land use and catchment hydrology for the age of exported carbon, we measured the radiocarbon abundances in two mountainous streams in Germany. The Hassel catchment was characterized by wider-stretched riparian areas and by a significant contribution of arable land and pasture to land use compared to the Rappbode catchment. Although soil cultivation is considered to mobilize old carbon from deep soil layers, in six out of eight situations dissolved organic carbon (DOC) was younger in Hassel stream compared to Rappbode. In contrast, we estimated annual exports of radiocarbon on the basis of yield weighed, bulked biweekly samples and found that older DOC was delivered from Hassel compared to Rappbode catchment (352years conventional radiocarbon age as well as carbon near to modern origin, respectively). This result characterized primarily the fluxes during wet conditions, which dominated the annual exports. In a winter base flow situation, we found that old (~2550years) snow-bound organic carbon deriving from atmospheric deposition contributed 29-43% to stream exports. Overall, there was significant intra-annual variability of stream 14C-DOC. Within the catchments, the standard deviations of ∆14C values (47-63‰) were comparable to the difference of annual exports between the contrasting catchments (46‰). Infrequent storm flow events should be included not only in export budgets but also in studies of carbon sources. Springer International Publishing Switzerland, 2015 DOC nationallicence TIC nationallicence Stream nationallicence 14C nationallicence 13C nationallicence Land use nationallicence Tittel Jörg Department Lake Research, UFZ Helmholtz Centre for Environmental Research, Brückstr. 3a, 39114, Magdeburg, Germany aut Müller Christin Department Catchment Hydrology, UFZ Helmholtz Centre for Environmental Research, Theodor-Lieser-Str. 4, 06120, Halle, Germany aut Schultze Martin Department Lake Research, UFZ Helmholtz Centre for Environmental Research, Brückstr. 3a, 39114, Magdeburg, Germany aut Musolff Andreas Department Hydrogeology, UFZ Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany aut Knöller Kay Department Catchment Hydrology, UFZ Helmholtz Centre for Environmental Research, Theodor-Lieser-Str. 4, 06120, Halle, Germany aut Biogeochemistry Springer International Publishing 126/1-2(2015-11-01), 57-69 0168-2563 126:1-2<57 2015 126 10533 https://doi.org/10.1007/s10533-015-0137-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0137-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tittel Jörg Department Lake Research, UFZ Helmholtz Centre for Environmental Research, Brückstr. 3a, 39114, Magdeburg, Germany aut NATIONALLICENCE 700 1- Müller Christin Department Catchment Hydrology, UFZ Helmholtz Centre for Environmental Research, Theodor-Lieser-Str. 4, 06120, Halle, Germany aut NATIONALLICENCE 700 1- Schultze Martin Department Lake Research, UFZ Helmholtz Centre for Environmental Research, Brückstr. 3a, 39114, Magdeburg, Germany aut NATIONALLICENCE 700 1- Musolff Andreas Department Hydrogeology, UFZ Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany aut NATIONALLICENCE 700 1- Knöller Kay Department Catchment Hydrology, UFZ Helmholtz Centre for Environmental Research, Theodor-Lieser-Str. 4, 06120, Halle, Germany aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 126/1-2(2015-11-01), 57-69 0168-2563 126:1-2<57 2015 126 10533