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Variability of groundwater levels and total organic carbon in the riparian zone of a boreal catchment
Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden.
Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden.
Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
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2011 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 116, no G1Article in journal (Refereed) Published
Abstract [en]

The riparian zone is a narrow corridor where hillslopes (and their associated hydrobiogeochemical processes) interface with the river system. As such, the riparian zone serves as the last piece of landscape with which water interacts as it transitions from being water flowing primarily through the landscape (i.e., shallow groundwater) to water flowing primarily on the landscape (i.e., stream water). This study investigates the spatiotemporal variability in riparian-zone soil water total organic carbon (TOC) and its relation to the shallow groundwater table using observations from the recently instrumented riparian observatory in the Krycklan catchment study area located in boreal northern Sweden. In general, there is a decrease in TOC concentration with depth down through the soil profile. The rate of this decrease was variable among the six monthly samplings used in this study. The spatial variability of soil water TOC in the riparian zone was connected to the spatial variability of the shallow groundwater levels. This demonstrated the importance of the temporal variation of flow pathways and the mixing of waters from different sources of TOC moving into and through the riparian zone. The coupled variation of the hydrologic and biogeochemical systems raised questions about the ability of simple lumped approaches to accurately predict how in-stream TOC concentrations will change with climate and/or land use. The integrated sampling approach in the riparian observatory covers both hydrologic and biogeochemical aspects of soil water TOC and provides a basis for development and testing of distributed, physically based transport models.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2011. Vol. 116, no G1
Keyword [en]
northern sweden, double paradox, stream, soils, water, runoff, export, identification, acidification, chemistry
National Category
Oceanography, Hydrology, Water Resources
Research subject
URN: urn:nbn:se:uu:diva-164910DOI: 10.1029/2010JG001452ISI: 000287809300002OAI: oai:DiVA.org:uu-164910DiVA: diva2:470863

727NY Times Cited:0 Cited References Count:49

Available from: 2011-12-30 Created: 2011-12-30 Last updated: 2013-01-11Bibliographically approved

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