Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

D3.1 Contemporary carbon stores and TEM parameters constrained by 20th century simulations

Studies based on observations of atmospheric CO2, remote sensing, and on carbon process models, have all indicated that vegetation activity in the Northern Hemisphere is increasing, and this leads to significant carbon sinks in these regions. A number of factors, such as fertilization effect of the increase in atmospheric CO2 concentration and nitrogen deposition, inter-annual climate variability, and lengthening growing season duration, have been supposed contributing to such increasing trends, but the main cause of these trends still remain uncertain (Schimel et al., 2001).

One of the primary objectives of CAMEL project is to improve our knowledge about the mechanisms of such increasing trends and recent carbon sinks. To achieve this goal, we use a terrestrial carbon cycle model ORCHIDEE forced by observed climate (Mitchell and Jones, 2005) and atmospheric CO2 variability to simulate terrestrial ecosystem carbon fluxes (NPP, HR and NEP) for the period from 1901 to 2002. Only modelling results from 1980 to 2002 were saved at every daily step to define timing of phenological events.

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