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Modeling total particulate organic carbon (POC) flows in the Baltic Sea catchment
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry. Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
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Number of Authors: 5
2016 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 128, no 1-2, 51-65 p.Article in journal (Refereed) Published
Abstract [en]

The largest input source of carbon to the Baltic Sea catchment is river discharge. A tool for modeling riverine particulate organic carbon (POC) loads on a catchment scale is currently lacking. The present study describes a novel dynamic model for simulating flows of POC in all major rivers draining the Baltic Sea catchment. The processes governing POC input and transport in rivers described in the model are soil erosion, in-stream primary production and litter input. The Baltic Sea drainage basin is divided into 82 sub-basins, each comprising several land classes (e.g. forest, cultivated land, urban areas) and parameterized using GIS data on soil characteristics and topography. Driving forces are temperature, precipitation, and total phosphorous concentrations. The model evaluation shows that the model can predict annual average POC concentrations within a factor of about 2, but generally fails to capture the timing of monthly peak loads. The total annual POC load to the Baltic Sea is estimated to be 0.34 Tg POC, which constitutes circa 7-10 % of the annual total organic carbon (TOC) load. The current lack of field measurements of POC in rivers hampers more accurate predictions of seasonality in POC loads to the Baltic Sea. This study, however, identifies important knowledge gaps and provides a starting point for further explorations of large scale POC mass flows.

Place, publisher, year, edition, pages
2016. Vol. 128, no 1-2, 51-65 p.
Keyword [en]
Soil erosion, Litter, Large-scale model, Organic carbon, Primary production, Drainage basin
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-130971DOI: 10.1007/s10533-016-0194-8ISI: 000374557300004OAI: oai:DiVA.org:su-130971DiVA: diva2:936477
Available from: 2016-06-14 Created: 2016-06-09 Last updated: 2016-06-14Bibliographically approved

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Dahlgren Strååt, KimMörth, Carl-MagnusSobek, AnnaSmedberg, ErikUndeman, Emma
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Department of Environmental Science and Analytical ChemistryDepartment of Geological SciencesStockholm University Baltic Sea Centre
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Biogeochemistry
Earth and Related Environmental Sciences

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