uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Water renewal along the aquatic continuum offsets cumulative retention by lakes: implications for the character of organic carbon in boreal lakes
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0003-2798-9018
Swedish University of Agricultural Sciences (SLU).
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Swedish University of Agricultural Sciences (SLU).
Show others and affiliations
2013 (English)In: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 75, no 4, 535-545 p.Article in journal (Refereed) Published
Abstract [en]

The character of organic carbon (OC) in lake waters is strongly dependent on the time water has spent in the landscape as well as in the lake itself due to continuous biogeochemical OC transformation processes. A common view is that upstream lakes might prolong the water retention in the landscape, resulting in an altered OC character downstream. We calculated the number of lakes upstream for 24,742 Swedish lakes in seven river basins spanning from 56º to 68º N. For each of these lakes, we used a lake volume to discharge comparison on a landscape scale to account for upstream water retention by lakes (Tn tot). We found a surprisingly weak relationship between the number of lakes upstream and Tn tot. Accordingly, we found that the coloured fraction of organic carbon was not related to lake landscape position but significantly related to Tn tot when we analysed lake water chemical data from 1,559 lakes in the studied river basins. Thus, we conclude that water renewal along the aquatic continuum by lateral water inputs offsets cumulative retention by lakes. Based on our findings, we suggest integrating Tn tot in studies that address lake landscape position in the boreal zone to better understand variations in the character of organic carbon across lake districts.

Place, publisher, year, edition, pages
2013. Vol. 75, no 4, 535-545 p.
Keyword [en]
Lake, Landscape, Time, Organic carbon, Colour
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-208615DOI: 10.1007/s00027-013-0298-3ISI: 000324577500006OAI: oai:DiVA.org:uu-208615DiVA: diva2:653687
Available from: 2013-10-04 Created: 2013-10-04 Last updated: 2016-05-24Bibliographically approved
In thesis
1. Lake Dissolved Organic Matter Quantity and Quality: Variability across Temporal and Spatial Scales
Open this publication in new window or tab >>Lake Dissolved Organic Matter Quantity and Quality: Variability across Temporal and Spatial Scales
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Surface waters receive large amounts of dissolved organic matter (DOM) via runoff from land. The DOM is rich in organic carbon that serves as an energy source for the aquatic biota. During uptake of this energy, aquatic organisms mineralize organic carbon. The resulting inorganic carbon is partially released to the atmosphere as carbon dioxide and methane that are greenhouse gases, and which are of concern for the ongoing global warming. The rate at which organic carbon is mineralized depends strongly on DOM quantity and quality that vary with respect to both time and space. In this thesis, DOM quantity and quality were addressed using spectroscopic methods that build on the absorptive and fluorescent properties of chromophoric DOM (CDOM). New techniques to measure CDOM absorption and fluorescence were applied and further developed that allowed us to present novel CDOM variability patterns. Addressing the lake-rich Scandinavian landscape, strong focus was placed on water retention by lakes that tightly links to lake DOM quantity and quality.

An analysis of 24,742 lakes from seven large Swedish river systems indicated that the majority of lakes in Sweden exchange their water within one year. From headwaters to the Sea, summed lake volumes in the catchments of lakes were found to increase at rates comparable to discharge, which indicated effective water renewal along flow. A strong relationship between lake water retention and CDOM was apparent and further investigated based on samples from a lake district to a regional scale.

Results from in situ high-frequency monitoring of CDOM absorption in a eutrophic humic lake showed intra-annual variability patterns known from oligotrophic lake systems. The patterns for CDOM absorption contrasted results obtained for synchronously measured partial pressures of carbon dioxide that showed diurnal signals. Measurements of CDOM fluorescence and DOC concentrations indicated lake-internal DOM production. A comparison of these results with results from addressing 560 lakes distributed across Sweden, showed that a well-calibrated CDOM fluorescence measurement captures signals from lake-internal DOM production. I conclude that improved CDOM fluorescence measurements are promising to address lake-internally produced DOM.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2015. 37 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1225
dissolved organic matter, organic carbon, CDOM, lakes
National Category
Environmental Sciences
Research subject
Biology with specialization in Limnology
urn:nbn:se:uu:diva-242335 (URN)978-91-554-9163-5 (ISBN)
Public defence
2015-03-27, Friessalen, Evolutionsbiologiskt Centrum (EBC), Norbyvägen 14, Uppsala, 10:00 (English)
Available from: 2015-03-02 Created: 2015-01-24 Last updated: 2016-05-24Bibliographically approved

Open Access in DiVA

Muller_etal_2013_accepted(968 kB)52 downloads
File information
File name FULLTEXT01.pdfFile size 968 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Müller, Roger A.Sobek, SebastianWeyhenmeyer, Gesa A.
By organisation
In the same journal
Aquatic Sciences
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 52 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 306 hits
ReferencesLink to record
Permanent link

Direct link