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Diagnostic Assessments of Carbon Fluxes on European and Global Scale

Martin Jung(1), Markus Reichstein(1), Dario Papale(2), Enrico Tomelleri(1), Christian Beer(1), Monica Robustelli(3), Nadine Gobron(3) and all FLUXNET PIs(4)

(1) MPI-BGC, Hans-Knöll-Str.10, 07745 Jena, Germany
(2) University of Tuscia, Via Camillo de Lellis, 01100 Viterbo, Italy
(3) EC Joint Research Centre, Via Enrico Fermi, I-21027 Ispra (VA), Italy
(4) FLUXNET, n/a, n/a, n/a

Abstract

Space derived biophysical vegetation properties like the Fraction of Absorbed Photosynthetic Active Radiation (FAPAR) are playing an increasingly important role in diagnostic modelling of the carbon cycle. The recent establishment of a harmonized global database of carbon flux measurements (the FLUXNET database) in conjunction with time series of remotely sensed FAPAR at the flux tower locations offers unique opportunities for exploring synergies between the communities, ranging from in-situ evaluation of space products to upscaling carbon fluxes using FAPAR as one important input. This talk reports on recent activities on European and global diagnostic modelling of carbon fluxes based on the JRC-FAPAR product. Preliminary results using the JRC SeaWiFS FAPAR product indicate that indeed FAPAR is a very strong predictor of both spatial and temporal variability of terrestrial vegetation productivity. Uncertainty in the model calibration phase arises from the spatial mismatch between the 2km FAPAR product and the smaller tower footprints. We expect that this uncertainty would be greatly reduced when we could link the carbon flux data to the higher resolution JRC-FAPAR product from MERIS. We will use the chance to provide feedback and user requirements for space products from the perspective of global scale carbon cycle assessments.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry