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Spatial Variability of Dissolved Organic and Inorganic Carbon in Subarctic Headwater Streams
Stockholm University, Faculty of Science, Department of Physical Geography.
Stockholm University, Faculty of Science, Department of Physical Geography.
2015 (English)In: Arctic, Antarctic and Alpine research, ISSN 1523-0430, E-ISSN 1938-4246, Vol. 47, no 3, 529-546 p.Article in journal (Refereed) Published
Abstract [en]

The subarctic landscape is composed of a complex mosaic of vegetation, geology and topography, which control both the hydrology and biogeochemistry of streams across space and time. We present a synoptic sampling campaign that aimed to estimate dissolved C export variability under low-flow conditions from a subarctic landscape. The results included measurements of stream discharge and concentrations of both dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and carbon dioxide (CO2) for 32 subcatchments of the Abiskojokka catchment in northern Sweden. For these subarctic headwater streams, we found that DOC, DIC and CO2 concentrations showed significant variability (p < 0.05) relative to catchment size, discharge, specific discharge, lithology, electrical conductivity, weathering products, and the estimated travel time of water through the subcatchment. Our results indicate that neither vegetation cover nor lithology alone could explain the concentrations and mass flux rates of DOC and DIC. Instead, we found that mass flux rates of DOC, DIC, and CO2 depended mainly on specific discharge and water travel time. Furthermore, our results demonstrate the importance of studying lateral carbon transport in combination with hydrological flow paths at small scales to establish a knowledge foundation applicable for expected carbon cycle and hydroclimatic shifts due to climate change.

Place, publisher, year, edition, pages
2015. Vol. 47, no 3, 529-546 p.
National Category
Earth and Related Environmental Sciences
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-115245DOI: 10.1657/AAAR0014-044ISI: 000359679000011OAI: oai:DiVA.org:su-115245DiVA: diva2:796141
Available from: 2015-03-18 Created: 2015-03-18 Last updated: 2017-04-24Bibliographically approved
In thesis
1. Waterborne Carbon in Northern Streams: Controls on dissolved carbon transport across sub-arctic Scandinavia
Open this publication in new window or tab >>Waterborne Carbon in Northern Streams: Controls on dissolved carbon transport across sub-arctic Scandinavia
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Waterborne carbon (C) forms an active and significant part of the global C cycle, which is important in theArctic where greater temperature increases and variability are anticipated relative to the rest of the globe withpotential implications for the C cycle. Understanding and quantification of the current processes governing themovement of C by connecting terrestrial and marine systems is necessary to better estimate future changes ofwaterborne C. This thesis investigates how the sub-arctic landscape influences the waterborne carbon exportby combining data-driven and modeling methods across spatial and temporal scales. First, a study of the stateof total organic carbon monitoring in northern Scandinavia was carried out using national-scale monitoringdata and detailed data from scientific literature. This study, which highlights the consistency in land cover andhydroclimatic controls on waterborne C across northern Scandinavia, was combined with three more detailedstudies leveraging field measurements and modeling. These focused on the Abisko region to provide insightto processes and mechanisms across scales. The thesis highlights that the governing transport mechanismsof dissolved organic and inorganic carbon (DOC and DIC respectively) are fundamentally different due todifferences in release rates associated with the nature of their terrestrial sources (geogenic and organic matterrespectively). As such, the DIC mass flux exhibits a high flow-dependence whereas DOC is relatively flowindependent.Furthermore, these investigations identified significant relationships between waterborne C andbiogeophysical as well as hydroclimatic variables across large to small spatial scales. This thesis demonstratesthat both surface and sub-surface hydrological processes (such as flow pathway distributions) in combinationwith distributions of C sources and associated release rates are prerequisite for understanding waterborne Cdynamics in northern streams.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography, Stockholms Universitet, 2015
Series
Dissertations from the Department of Physical Geography, ISSN 1653-7211 ; 48
Keyword
dissolved carbon, DOC, DIC, TOC, sub-arctic, hydrology, Abisko
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
urn:nbn:se:su:diva-115883 (URN)978-91-7649-141-6 (ISBN)
Public defence
2015-05-22, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2007-8393
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Submitted. Paper 4: Accepted.

Available from: 2015-04-29 Created: 2015-04-07 Last updated: 2015-04-30Bibliographically approved

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