Integrating carbon emissions from lakes and streams in a subarctic catchment

Summary, in English

Northern inland waters emit CO2 and CH4 to the atmosphere but the importance of these emissions is poorly understood due to a lack of integrated catchment-scale estimates of carbon (C) emissions from lakes and streams. In this study we quantified the annual emission of CO2 and CH4 from 27 lakes and 23 stream segments in a 15km(2) subarctic catchment in northern Sweden. All lakes and streams were net sources of C to the atmosphere on an annual basis. Streams dominated (96%) the aquatic CO2 emission while lakes (61%) dominated the aquatic CH4 emission. Total aquatic C emission from the catchment was estimated to be 9.1gCm(-2)yr(-1) (98% as CO2). Although streams only accounted for 4% of the aquatic area in the catchment, they accounted for 95% of the total emission. The C emissions from lakes and streams were considerably larger than previously reported downstream waterborne export of C from the catchment, indicating that the atmospheric losses of C in the aquatic systems are an important component in the catchment C balance.

• Author: Erik J. Lundin; Reiner Giesler; Andreas Persson; Megan S. Thompson; Jan Karlsson
• Department/s: Dept of Physical Geography and Ecosystem Science
• Publishing year: 2013
• Language: English
• Pages: 1200-1207
• Publication/Series: Journal of Geophysical Research - Biogeosciences
• Volume: 118
• Issue: 3
• Links: http://dx.doi.org/10.1002/jgrg.20092
• Document type: Journal article
• Publisher: Wiley
• Topic: Physical Geography
• Keywords: subarctic; streams; lakes; CO2; CH4; emission
• Status: Published
• ISBN/ISSN/Other: ISSN: 2169-8953