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Title [sv]
Emisson av växthusgaser från sjöar i nordliga områden med permafrost: kvantitativ betydelse och klimatpåverkan
Title [en]
Greenhouse gas emission from lakes in northern permafrost areas:quantitative importance and climate impacts
Abstract [sv]
Climate change and thawing of permafrost causes mobilization and decomposition of old C stocks from high latitude soils and, hence, releases significant amounts of greenhouse gases to the atmosphere. Data now suggest that permafrost thawing also increases export and decomposition of old terrestrial organic C stocks in lakes, implying a substantial flux of terrestrial organic C to the atmosphere. The aim of the study is to investigate the importance of lakes for atmospheric release of terrestrial organic C in regions of melting permafrost. We will test the hypothesis that warming and thawing of permafrost increases the export, respiration and atmospheric emission of old terrestrial organic C in lakes. Further, we hypothesise that thawing permafrost increases the quantitative importance of lakes for C emissions. We will carry out a comparative study of continuous automatic C flux measurements over a permafrost lake with ongoing terrestrial C flux measurements, and we will perform unique multiyear quantifications of the C balance in a catchment undergoing thawing of permafrost. We perform comparative studies of lake catchments along a gradient of documented permafrost thawing in order to assess if thawing is increasing the export and respiration of old C stocks in lakes. Finally, we carry out experimental studies to assess the effect of thawing and temperature on the respiration of terrestrial organic C in lakes.
Principal InvestigatorKarlsson, Jan
Coordinating organisation
Umeå University
2009-01-01 - 2011-12-31
DiVA, id: project:875Project, id: 2008-04390_VR

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