The effect of climate change on arctic and sub-arctic ecosystem CO2 emission
Nynne Rand Ravn, PhD student, BIO/CENPERM
Cold temperature at northern latitudes has through time kept mineralization low and this region has in that way acted as a sink of carbon and a stock of old organic carbon has been built up in many arctic soils. Climate changes can potentially stimulate soil mineralization and lead to a release of CO2 originating in the old stock of soil carbon. This may change the Arctic area from being a sink area to a source of carbon dioxide to the atmosphere, which is likely to increase the CO2 concentration of the atmosphere even further, creating a “positive” feedback to climate change.
By measuring isotope composition and emissions of CO2 from different arctic and subarctic ecosystems under climate manipulations, I aim to address whether climatic changes, as those that are likely to happen in the future, affects the amount of CO2 released and if the CO2 originates from old carbon stored in the soil or from newly fixed carbon.
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