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| Titel |
Dissolved inorganic carbon export from carbonate and silicate catchments estimated from carbonate chemistry and δ¹³CDIC |
| VerfasserIn |
W. J. Shin, G. S. Chung, D. Lee, K. S. Lee |
| 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 ; 15, no. 8 ; Nr. 15, no. 8 (2011-08-16), S.2551-2560 |
| Datensatznummer |
250012926
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| Publikation (Nr.) |
 copernicus.org/hess-15-2551-2011.pdf |
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| Zusammenfassung |
| This work presents a study of the dissolved inorganic carbon (DIC) exchange
associated with groundwater discharge and stream flow from two upstream
catchments with distinct basement lithologies (silicate vs. carbonate). The
effects of catchment lithology were evident in the spring waters showing
lower δ13CDIC and alkalinity (−16.2 ± 2.7 ‰ and
0.09 ± 0.03 meq l−1, respectively) in the silicate and higher values
(−9.7 ± 1.5 ‰ and 2.0 ± 0.2 meq l−1) in the carbonate
catchment. The streams exhibited relatively high δ13CDIC,
−6.9 ± 1.6 ‰ and −7.8 ± 1.5 ‰, in silicate and carbonate
catchments, respectively, indicating CO2 degassing during groundwater
discharge and stream flow. The catchment lithology affected the pattern of
DIC export. The CO2 degassing from stream and groundwater could be
responsible for 8–55 % of the total DIC export in the silicate catchment,
whereas the proportion is comparatively low (0.4–5.6 %) in the carbonate
catchment. Therefore, the dynamic carbon exchange occurring at headwater
regions and its possible variability with catchment lithology need to be
examined for a more reliable carbon budget in river systems. |
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