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| Titel |
Subsurface release and transport of dissolved carbon in a discontinuous permafrost region |
| VerfasserIn |
E. J. Jantze, S. W. Lyon, G. Destouni |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 10 ; Nr. 17, no. 10 (2013-10-08), S.3827-3839 |
| Datensatznummer |
250085948
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| Publikation (Nr.) |
 copernicus.org/hess-17-3827-2013.pdf |
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| Zusammenfassung |
| Subsurface hydrological flow pathways and advection rates through the
landscape affect the quantity and timing of hydrological transport of
dissolved carbon. This study investigates hydrological carbon transport
through the subsurface to streams and how it is affected by the distribution
of subsurface hydrological pathways and travel times through the landscape.
We develop a consistent mechanistic, pathway- and travel time-based modeling
approach for release and transport of dissolved organic carbon (DOC) and
dissolved inorganic carbon (DIC). The model implications are tested against
observations in the subarctic Abiskojokken catchment in northernmost Sweden
(68°21' N, 18°49' E) as a field case example of a
discontinuous permafrost region. The results show: (a) For DOC, both
concentration and load are essentially flow-independent because their
dynamics are instead dominated by the annual renewal and depletion.
Specifically, the flow independence is the result of the small characteristic
DOC respiration-dissolution time scale, in the range of 1 yr, relative to
the average travel time of water through the subsurface to the stream. (b)
For DIC, the load is highly flow-dependent due to the large characteristic
weathering-dissolution time, much larger than 1 yr, relative to the average
subsurface water travel time to the stream. This rate relation keeps the DIC
concentration essentially flow-independent, and thereby less fluctuating in
time than the DIC load. |
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