Som en del af kurset "Marine økosystemer under klimaforandring" holder professor John Anderson fra Loughborough University foredraget "Lakes and carbon cycling in the Arctic: what can we learn from the Kangerlussuaq Lake District (SW Greenland)?"
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Resumé
The Arctic represents a major store of organic carbon, most of it in frozen soils; sustained warming at high latitudes threatens to release this C pool into the atmosphere as CO2. Lakes form a major component of Arctic landscapes and have two important roles in relation to C dynamics: mineralizing terrestrially-derived organic carbon (OC) and sequestering (storing) carbon in their sediments. Regional warming, permafrost thawing and altered soil microbiology may result in release of CO2 but also lateral movement of OC pools and soil-derived nutrients which can affect lake functioning (increasing productivity). The Kangerlussuaq area has thousands of lakes covering a regional climate gradient (both precipitation and temperature) which have varying dissolved organic C (DOC) concentrations. After a brief review of the main characteristics of arctic lakes and the key limnic processes, I will illustrate our recent work on carbon dynamics in the lakes along Søndre Strømfjord (Kangerlussuaq) which has focussed on characterizing C fluxes in lakes as well as the importance of the DOC pool in the lakes for their functioning.
Kursus i marine økosystemer under klimaforandring
Foredraget er en del af kurset "Marine økosystemer under klimaforandring".
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