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The climate sensitivity of the Osnabrück Biosphere model on the ENSO time scale

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Kaduk, J., & Heimann, M. (1994). The climate sensitivity of the Osnabrück Biosphere model on the ENSO time scale. Ecological Modelling, 75-76, 239-256. doi:10.1016/0304-3800(94)90022-1.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-A02D-7
Abstract
Time series of the atmospheric CO 2 concentration 1957-1980 show a distinct oscillatory behaviour, related primarily to the seasonal cycle of the land vegetation on the northern hemisphere, which is superimposed on an almost exponential increase, originating in the release of CO 2 from industrial activities. Subtraction of these regular features reveals anomalies of the atmospheric CO 2 concentration of considerable magnitude, reflecting transient imbalances of the natural carbon exchange fluxes between atmosphere, terrestrial biosphere and ocean which are induced by climate fluctuations such as the El Nifio-Southern Oscillation (ENSO) phenomenon. Reconstruction of these concentration anomalies may provide a means of validating climate-driven carbon cycle models. We employed the Osnabriick Biosphere Model (OBM) to explore this approach. We ran the model from a preindustrial steady state to 1980 prescribing emissions of CO 2 from fossil fuel burning with observed climate data. The simulated anomalous CO 2 fluxes 1958-1980 correlate with observational estimates. However, the simulated amplitude is about a factor 3 too small, indicating a 1oo small sensitivity of the model to the climate perturbations. The spatial pattern of the anomalous net biospheric flux reflects those regions where anomalies are anticorrelated to ENSO indices.