Change search
ReferencesLink to record
Permanent link

Direct link
Role of lakes for organic carbon cycling in the boreal zone
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Show others and affiliations
2004 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 10, no 1, 141-147 p.Article in journal (Refereed) Published
Abstract [en]

We calculated the carbon loss (mineralization plus sedimentation) and net CO2 escape to the atmosphere for 79 536 lakes and total running water in 21 major Scandinavian catchments (size range 437–48 263 km2). Between 30% and 80% of the total organic carbon that entered the freshwater ecosystems was lost in lakes. Mineralization in lakes and subsequent CO2 emission to the atmosphere was by far the most important carbon loss process. The withdrawal capacity of lakes on the catchment scale was closely correlated to the mean residence time of surface water in the catchment, and to some extent to the annual mean temperature represented by latitude. This result implies that variation of the hydrology can be a more important determinant of CO2 emission from lakes than temperature fluctuations. Mineralization of terrestrially derived organic carbon in lakes is an important regulator of organic carbon export to the sea and may affect the net exchange of CO2 between the atmosphere and the boreal landscape.

Place, publisher, year, edition, pages
Oxford: Blackwell Scientific , 2004. Vol. 10, no 1, 141-147 p.
Keyword [en]
boreal lakes, CO2 emission, mineralization, organic matter, terrestrial export, water residence time
URN: urn:nbn:se:umu:diva-4407DOI: 10.1111/j.1365-2486.2003.00721.xOAI: diva2:143494
Available from: 2005-02-17 Created: 2005-02-17 Last updated: 2011-03-08Bibliographically approved
In thesis
1. Regulation of carbon dioxide emission from Swedish boreal lakes and the Gulf of Bothnia
Open this publication in new window or tab >>Regulation of carbon dioxide emission from Swedish boreal lakes and the Gulf of Bothnia
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The global carbon cycle is subject to intense research, where sources and sinks for greenhouse gases, carbon dioxide in particular, are estimated for various systems and biomes. Lakes have previously been neglected in carbon balance estimations, but have recently been recognized to be significant net sources of CO2.

This thesis estimates emission of carbon dioxide (CO2) from boreal lakes and factors regulating the CO2 saturation from field measurements of CO2 concentration along with a number of chemical, biological and physical parameters. Concentration of dissolved organic carbon (DOC) was found to be the most important factor for CO2 saturation in lake water, whereas climatic parameters such as precipitation, temperature and global radiation were less influential. All lakes were supersaturated with and, thus, sources of CO2. Sediment incubation experiments indicated that in-lake mineralization processes during summer stratification mainly occurred in the pelagial. Approximately 10% of the CO2 emitted from the lake surface was produced in epilimnetic sediments.

The mineralization of DOC and emission of CO2 from freshwaters was calculated on a catchment basis for almost 80,000 lakes and 21 major catchments in Sweden, together with rates of sedimentation in lakes and export of organic carbon to the sea. The total export of terrestrial organic carbon to freshwaters could thereby be estimated and consequently also the importance of lakes for the withdrawal of organic carbon export from terrestrial sources to the sea. Lakes removed 30-80% of imported terrestrial organic carbon, and mineralization and CO2 emission were much more important than sedimentation of carbon. The carbon loss was closely related to water retention time, where catchments with short residence times (<1 year) had low carbon retentions, whereas in catchments with long residence times (>3 years) a majority of the imported TOC was removed in the lake systems.

The Gulf of Bothnia was also studied in this thesis and found to be a net heterotrophic system, emitting large amounts of CO2 to the atmosphere on an annual basis. The rate of CO2 emission was depending on the balance between primary production and bacterial respiration, and the system was oscillating between being a source and a sink of CO2.

Place, publisher, year, edition, pages
Umeå universitet, 2005. 24 p.
Physical geography and sedimentology, lakes, boreal, Gulf of bothnia, CO2, NEE, DOC, mineralization, sediment, catchment, net heterotrophy, Naturgeografi och sedimentologi
National Category
Physical Geography
Research subject
Physical Geography
urn:nbn:se:umu:diva-453 (URN)91-7305-818-1 (ISBN)
Public defence
2005-03-11, KB3B1, KBC-huset, Umeå universitet, Umeå, 10:00
Available from: 2005-02-17 Created: 2005-02-17 Last updated: 2011-03-21Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Bergström, Ann-KristinJansson, Mats
By organisation
Ecology and Environmental ScienceDepartment of Ecology and Environmental Sciences
In the same journal
Global Change Biology

Search outside of DiVA

GoogleGoogle Scholar
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: 366 hits
ReferencesLink to record
Permanent link

Direct link