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Lake phosphorus dynamics and climate warming: A mechanistic model approach
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
In: Ecological ModellingArticle in journal (Refereed) Submitted
URN: urn:nbn:se:uu:diva-92268OAI: oai:DiVA.org:uu-92268DiVA: diva2:165280
Available from: 2004-10-14 Created: 2004-10-14Bibliographically approved
In thesis
1. Predictive Modeling of Lake Eutrophication
Open this publication in new window or tab >>Predictive Modeling of Lake Eutrophication
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents predictive models for important variables concerning eutrophication effects in lakes. The keystone is a dynamic phosphorus model based on ordinary differential equations. By calculating mass fluxes of phosphorus into, within and out from a lake, the concentrations of different forms of phosphorus in different compartments of the lake are estimated.

The dynamic phosphorus model is critically tested and several improvements are presented, including two new compartments for colloidal phosphorus, a sub-model for suspended particulate matter (SPM) and new algorithms for lake outflow, water mixing, diffusion, water content and organic content of accumulation sediments are implemented. Predictions with the new version show good agreement against empirical data in five tested lakes.

The sub-model for SPM uses the same driving variables as the basic phosphorus model, so the inclusion of this model as a sub-model does not require any additional variables. The model for SPM may also be used as a separate model giving monthly predictions of suspended particulate matter in two water compartments and one compartment with SPM available for resuspension in ET-sediments.

Empirical data from Lake Erken (Sweden) and Lake Balaton (Hungary) are used to evaluate the variability in settling velocity of SPM. It is found that the variability is substantial and may be accounted for by using a dimensionless moderator for SPM concentration. Empirical data from accumulation area sediments in Lake Erken are used to develop a model for the dynamics of phosphorus sedimentation, burial and diffusion in the sediments. The model is shown to provide reasonable monthly predictions of four functional forms of phosphorus at different sediment depths.

Simulations with the lake phosphorus model using two different climate scenarios indicate that lakes may respond very differently to climate change depending on their physical character. Lake Erken, with a water retention time of 7 years, appears to be much more sensitive than two basins of Lake Mälaren (Sweden) with substantially shorter retention times. The implication would be that in eutrophic lakes with long water retention times, eutrophication problems may become serious if the future becomes warmer. This will be important in contexts of lake management when remedial measures against lake eutrophication have to be taken.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 37 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1028
Earth sciences, mass balance model, dynamic model, mechanistic model, phosphorus, LEEDS, suspended particulate matter, settling velocity, sedimentation, accumulation sediments, burial, diffusion, climate scenario, Erken, Balaton, Kinneret, Batorino, Miastro, Naroch, Galten, Ekoln, Geovetenskap
National Category
Earth and Related Environmental Sciences
urn:nbn:se:uu:diva-4625 (URN)91-554-6065-8 (ISBN)
Public defence
2004-11-12, Hambergsalen, Geocentrum, Villav. 16, Uppsala, 10:00
Available from: 2004-10-14 Created: 2004-10-14Bibliographically approved

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