Boreal and arctic ecosystems are of great importance in the global carbon cycle. There is evidence that climate of the arctic has
warmed significantly in the last 30 years (Sereeze et al. 2000).
Hinzman et al. 2005 povide a review of indicators for the response of arctic ecosystems
to an altered climate: new extreme and seasonal
climatic conditions are recorded, later freeze-up and
earlier break-up of arctic rivers and lakes mirror increase
in air temperatures and altered hydrological and biochemical cycles.
Human social systems and subsistence hunting and fishing are being affected.
Permafrost ist one of the main driving factor for tundra vegetation in high latitudes.
Climate warming has a great impact especially on permafrost areas because melting of
permafrost and the related deepening
of the active layer can drastically increase soil organic matter mineralization.
Little is known on consequences for carbon and nitrogen fluxes between soil,
atmosphere and hydrosphere.
Physiologically based ecosystem process models are important tools to quantify
fluxes of carbon and other elements.
Research for the integration of remote sensing and environmental data into
process models is needed to validate model-based flux estimates on local
to regional scale.