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Subsurface release and transport of dissolved carbon in a discontinuous permafrost region
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2013 (English)In: Hydrology and Earth System Sciences, ISSN 1027-5606, E-ISSN 1607-7938, Vol. 17, no 10, 3827-3839 p.Article in journal (Refereed) Published
Abstract [en]

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 degrees 21'N, 18 degrees 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.

Place, publisher, year, edition, pages
2013. Vol. 17, no 10, 3827-3839 p.
National Category
Oceanography, Hydrology, Water Resources
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-97404DOI: 10.5194/hess-17-3827-2013ISI: 000326603200010OAI: oai:DiVA.org:su-97404DiVA: diva2:678023
Funder
Swedish Research Council, 2007-8393
Note

AuthorCount:3;

Available from: 2013-12-11 Created: 2013-12-09 Last updated: 2017-12-06Bibliographically 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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