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Modelling dissolved organic carbon turnover in humic Lake Örträsket, Sweden
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
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2001 (English)In: Environmental Modelling and Assessment, ISSN 1420-2026, E-ISSN 1573-2967, Vol. 6, no 3, 159-172 p.Article in journal (Refereed) Published
Abstract [en]

The organic carbon balance of a lake with high input of allochthonous organic carbon is modelled integrating physical, chemical and biological processes. The physical model captures the behaviour of real thermal stratification in the lake for different flow situations during the period 1993-1997. The dissolved organic carbon model is based on simulated trajectories of water parcels. By tracking parcels, account is kept of environmental factors such as temperature and radiation as well as DOC quality for each parcel, The DOC concentration shows seasonal variations primarily dependent on inflow. The organic matter degradation (bacterial- and photodegradation) in the lake amounts to 1.5-2.5 mg C l(-1) yr(-1), where photooxidation is responsible for approximately 10%. The estimated DIC production in the lake is large compared to sediment mineralisation and primary production. The main conclusion is that the model with the selected parameterisations of the degradation processes reasonably well describes the DOC dynamics in a forest lake.

Place, publisher, year, edition, pages
2001. Vol. 6, no 3, 159-172 p.
Identifiers
URN: urn:nbn:se:umu:diva-37611ISI: 000172030000002OAI: oai:DiVA.org:umu-37611DiVA: diva2:369385
Available from: 2010-11-10 Created: 2010-11-10 Last updated: 2017-12-12Bibliographically approved

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Jonsson, AndersBergström, Ann-KristinJansson, Mats
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