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Biosphere Modeling Galina Churkina MPI for Biogeochemistry
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Biosphere - Biosphere modeling? … all living and non-living matters which have been affected in any way by life… Vegetation, ecosystems Human impacts
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Types and purposes of vegetation models Models’ verification Advantages and issues Vegetation Modeling
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Purposes To examine and predict: plant population dynamics considering competition between individual species changes in energy flows and biogeochemical cycling of ecosystems vegetation distribution and its shifts (biogeography models)
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Plant population models ( gap models ) To predict plant population dynamics considering: plant competition establishment growth mortality Time step - years
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To describe vertical exchange of energy and water fluxes Vegetation is a “barrier” between land surface and the atmosphere Carbon flux was added Time step - seconds Soil-Vegetation-Atmosphere- Transfer
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Ecosystem models Changes in carbon, nitrogen, water fluxes and/or storage of ecosystems Trees are not defined individually Climatic inputs + plant physiology/empiric relationships Time step - days, months, years
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D ynamic G lobal V egetation M odels To examine and predict changes in vegetation distribution Changes in carbon, water fluxes and/or storage of ecosystems Time step - months, years
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Inputs and outputs after Cramer et al. 1999
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How to verify the model results?
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Site Level Constraints gC/m 2 /day month Measured data are from Tharand, Germany After parameter optimization
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Spatial constrains month Remotely sensed DATA from MODIS LAI simulated with BIOME-BGC model
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Global constraints? Effect of industrial N deposition on global normalized NEP and NPP (kgC/m2/yr)
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Verification at different scales Global: atmospheric inversions Regional: country statistics (forest inventories,etc.) remote sensing Landsat, MODIS, SeaWiFS Site level: measurements of ecosystem/soil C fluxes, C/N content in vegetation or soil mean residence time of C in soil etc. Vegetation model
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Advantages Simulate responses of ecosystems to regionally heterogeneous temperature and rainfall anomalies nitrogen deposition rate land use Generate predictions
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Issue Verification of model results at regional and global scales Simulation of human impacts on ecosystems
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Churkina & Running, 1998 Dominant controls for carbon, energy and water fluxes Radiation WaterTemperature
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Can we neglect human activities?
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