The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.
CO2 supersaturation along the aquatic conduit in Swedish watersheds as constrained by terrestrial respiration, aquatic respiration and weathering
Abstract
We tested the hypothesis that CO 2 supersaturation along the aquatic conduit over Sweden can be explained by processes other than aquatic respiration. A first generalized‐additive model (GAM) analysis evaluating the relationships between single water chemistry variables and p CO 2 in lakes and streams revealed that water chemistry variables typical for groundwater input, e.g., dissolved silicate (DSi) and Mg 2+ had explanatory power similar to total organic carbon (TOC). Further GAM analyses on various lake size classes and stream orders corroborated the slightly higher explanatory power for DSi in lakes and Mg 2+ for streams compared with TOC. Both DSi and TOC explained 22–46% of the p CO 2 variability in various lake classes (0.01–>100 km 2) and Mg 2+ and TOC explained 11–41% of the p CO 2 variability in the various stream orders. This suggests that aquatic p CO 2 has a strong groundwater signature. Terrestrial respiration is a significant source of the observed supersaturation and we may assume that both terrestrial respiration and aquatic respiration contributed equally to p CO 2 efflux. p CO 2 and TOC concentrations decreased with lake size suggesting that the longer water residence time allow greater equilibration of CO 2 with the atmosphere and in‐lake mineralization of TOC. For streams, we observed a decreasing trend in p CO 2 with stream orders between 3 and 6. We calculated the total CO 2 efflux from all Swedish lakes and streams to be 2.58 Tg C yr−1. Our analyses also demonstrated that 0.70 Tg C yr−1 are exported to the ocean by Swedish watersheds as HCO 3− and CO 32− of which about 0.56 Tg C yr−1 is also a residual from terrestrial respiration and constitute a long‐term sink for atmospheric CO 2. Taking all dissolved inorganic carbon (DIC) fluxes along the aquatic conduit into account will lower the estimated net ecosystem C exchange (NEE) by 2.02 Tg C yr−1, which corresponds to 10% of the NEE in Sweden.
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Cites
Wood, S. N. (2006) · doi:10.1201/9781420010404 · Cited by 4,953
Global silicate weathering and CO2 consumption rates deduced from the chemistry of large rivers
Gaillardet, J., Dupré, B., Louvat, P., & Allègre, C. J. (1999) · Chemical Geology · doi:10.1016/s0009-2541(99)00031-5 · Cited by 3,334
Cited by
Global carbon dioxide emissions from inland waters
Raymond, P. A., Hartmann, J., Lauerwald, R., Sobek, S., McDonald, C., Hoover, M., Butman, D., Striegl, R., Mayorga, E., Humborg, C., et al. (2013) · Nature · doi:10.1038/nature12760 · Cited by 2,553
Self-citationAbril, G., Bouillon, S., Darchambeau, F., Teodoru, C. R., Marwick, T. R., Tamooh, F., Ochieng Omengo, F., Geeraert, N., Deirmendjian, L., Polsenaere, P., et al. (2015) · Biogeosciences · doi:10.5194/bg-12-67-2015 · Cited by 361
Metadata
- Authors
- HUMBORG, C., MÖRTH, C., SUNDBOM, M., BORG, H., BLENCKNER, T., GIESLER, R., & ITTEKKOT, V.
- Venue
- Global Change Biology
- Publisher
- Wiley
- Published
- 2010-06
- Volume
- 16
- Issue
- 7
- Pages
- 1966-1978
- ISSN
- 1354-1013 (ISSN-L)
- 1365-2486
- OpenAlex
- W1587248344
- Cited by
- 211
- References
- 2
- FWCI
- 13.43
- Type
- journal article
- Language
- en
- Open access
- closed
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- HUMBORG, C., MÖRTH, C., SUNDBOM, M., BORG, H., BLENCKNER, T., GIESLER, R., & ITTEKKOT, V. (2010). CO2 supersaturation along the aquatic conduit in Swedish watersheds as constrained by terrestrial respiration, aquatic respiration and weathering. Global Change Biology. https://doi.org/10.1111/j.1365-2486.2009.02092.x
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