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Physical versus biogeochemical interpretations of nitrogen and phosphorus attenuation in streams and its dependence on stream characteristics
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. Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2007 (English)In: Global Biogeochemical Cycles, Vol. 21, no GB3003Article in journal (Refereed) Published
Abstract [en]

We investigate the influence of biogeochemical nutrient attenuation rates versus physical solute travel times on nutrient transport and attenuation in streams with different characteristics. Comparative results indicate smaller biogeochemical in-stream attenuation rate and greater decrease of this rate with stream depth for phosphorus than for nitrogen. Because physical solute travel times also decrease with stream depth, equally for both nutrients, the resulting relative nutrient mass attenuation becomes essentially independent of stream depth for phosphorus but decreases with stream depth for nitrogen. Coarse interpretation models, without relevant representation of subgrid physical transport variability may lead to systematic misinterpretation of relative nitrogen mass attenuation behavior as a predominantly biogeochemical attenuation rate effect instead of a physical transport time effect. Incorrect understanding and distinction between

physical and biogeochemical processes and effects may generally induce misleading cause-effect conclusions on environmental loads and prevent us from reaching environmental goals of worldwide importance.

Place, publisher, year, edition, pages
2007. Vol. 21, no GB3003
Identifiers
URN: urn:nbn:se:su:diva-22525DOI: doi:10.1029/2006GB002901OAI: oai:DiVA.org:su-22525DiVA: diva2:189052
Available from: 2007-08-13 Created: 2007-08-13 Last updated: 2011-01-11Bibliographically approved

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Darracq, AmelieDestouni, Georgia
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