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Intra-annual variability of natural organic matter in boreal streams

patterns and controls

Winterdahl, Mattias (2013). Intra-annual variability of natural organic matter in boreal streams. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2013:1
ISBN 978-91-576-7758-7
[Doctoral thesis]

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Natural organic matter (NOM) is a key component in aquatic ecosystems. It influences for example acidity, mobility and toxicity of metals and organic pollutants, energy input to aquatic food webs, weathering, and water light conditions. There are also considerable costs associated with removing NOM in drinking water production. Furthermore, NOM is an integral part of the carbon cycle with possible indirect effects on climate. During recent decades, there have been observations of increasing concentrations of NOM in surface waters in parts of North America and Europe. The causes of these trends are not fully understood, but are thought to be related to climate change and recovery from anthropogenic acidification. This thesis presents results from studies on intra-annual NOM cycling in more than 130 boreal streams and rivers. It also presents developments of the Riparian flow-concentration Integration Model (RIM).

Detailed studies on five forested headwater catchments revealed that stream discharge and soil temperature were the main drivers of NOM variability. In addition, a small headwater catchment at the Swedish West Coast was substantially influenced by sea-salt deposition, which suppressed NOM mobilization. A modified version of RIM with discharge and soil temperature as variables could successfully simulate NOM dynamics in all five catchments. Riparian soil organic matter content and distribution was hypothesized to be the underlying control on NOM response to discharge and soil temperature. Catchments where NOM was sensitive to discharge displayed stronger gradients in soil NOM concentrations than did catchments with weak discharge sensitivity.

A large scale study of 136 streams and rivers indicated common relationships among NOM, discharge and temperature. Conversely, there was no geographical pattern in NOM trends. Relative trends were weakly related to NOM response to flow and temperature. There were also clear relationships among intra-annual NOM dynamics, temperature, flow, and catchment landscape characteristics, indicating that catchments can be classified based on NOM dynamics. Taken together, this implies that NOM dynamics could change in ways not reflected in inter-annual trends due to climate change.

Authors/Creators:Winterdahl, Mattias
Title:Intra-annual variability of natural organic matter in boreal streams
Subtitle:patterns and controls
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :January 2013
Number of Pages:62
I.Winterdahl, M., Futter, M., Köhler, S., Laudon, H., Seibert, J., Bishop, K. (2011). Riparian soil temperature modification of the relationship between flow and dissolved organic carbon concentration in a boreal stream. Water Resources Research 47, W08532, doi:10.1029/2010WR010235.
II.Winterdahl, M., Temnerud, J., Futter, M. N., Löfgren, S., Moldan, F., Bishop, K. (2011). Riparian Zone Influence on Stream Water Dissolved Organic Carbon Concentrations at the Swedish Integrated Monitoring Sites. AMBIO 40(8), 920-930.
III.Winterdahl, M., Futter, M. N., Grabs, T., Bishop K. Sensitivity of dissolved organic carbon in boreal streams to temperature and runoff (manuscript).
IV.Winterdahl, M., Erlandsson, M. N., Futter, M., Weyhenmeyer, G. A., Bishop, K. Intra-annual variability of organic carbon concentrations in running waters: temporal drivers and relationship to inter-annual trends (manuscript).
Place of Publication:Uppsala
Publisher:Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Data from Environmental Assesment (FoMA) is used
ISBN for printed version:978-91-576-7758-7
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:P Natural resources > P10 Water resources and management
P Natural resources > P33 Soil chemistry and physics
U Auxiliary disciplines > U10 Mathematical and statistical methods
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Climate Research
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
Agrovoc terms:rivers, watersheds, organic matter, carbon, water quality, soil temperature, climatic change, models, boreal forests, sweden
Keywords:DOC, dissolved organic carbon, NOM, modeling, soil temperature, climate change, Krycklan catchment, GLUE
Permanent URL:
ID Code:9365
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
External funders:FORMAS
Deposited By: Mattias Winterdahl
Deposited On:21 Dec 2012 13:43
Metadata Last Modified:02 Dec 2014 10:54

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