A comparison of the carbon balances of a natural lake (L. Örträsket) and a hydroelectric reservoir (L. Skinnmuddselet) in northern Sweden
2004 (English)In: Water Research, Vol. 38, 531-538 p.Article in journal (Refereed) Published
Carbon balances were calculated for the summer stratification period of 2001 for the hydroelectric reservoir L. Skinnmuddselet (created in 1989) and the natural L. Örträsket, and estimated on annual basis for both lakes. The reservoir and the lake have similar chemical characteristics and are located in adjacent catchments in the northern part of Sweden. Our main hypothesis was that the CO2 production and emissions from the reservoir, L. Skinnmuddselet, would be greater than in the natural L. Örträsket, due to the decomposition of flooded vegetation and peat.
The carbon balances showed that the total production of CO2 per unit lake surface area during the summer was very similar in the natural lake and the reservoir (31.3 g C m−2 in L. Örträsket and 25.3 g C m−2 in L. Skinnmuddselet). The sediments were the major CO2 source in the reservoir, while most of the mineralization in the natural lake occurred in the water column. On annual basis the natural L. Örträsket produced and emitted more CO2 per unit of lake surface area than the reservoir L. Skinnmuddselet since mineralization proceeded during winter when L. Skinnmuddselet was emptied for electricity production. Therefore, the potential for CO2 emission was not greater in the reservoir than in the natural lake.
Place, publisher, year, edition, pages
2004. Vol. 38, 531-538 p.
IdentifiersURN: urn:nbn:se:umu:diva-8053DOI: 10.1016/j.watres.2003.10.035OAI: oai:DiVA.org:umu-8053DiVA: diva2:147724