A Bottom-Up Modelling Perspective on Representativeness: The Example of PIXGRO Europe J. Tenhunen.

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A Bottom-Up Modelling Perspective on Representativeness: The Example of PIXGRO Europe J. Tenhunen

MODLAND Sinusoidal Grid10 degree Tiles 10 degree Tiles Data Sources: DAO Radiation, Temperature, Precipitation USGS DEM, USGS Eurasia Land Cover European Soil Data Base JRC Country Mask MODIS LAI or other layers Conversion to sinusoidal projection GRASS Output in 1 km raster Cut to size Regridded to 10 km Substructure recorded PVWAVE Separate model runs for different landuse Final numbers come from post- processing Data Preparation Why 17? Process Controls!

Day of Year Downscaled DAO Climate LAI, SAI Phenology Leaf physiology Sunlit Shaded 1 Canopy Layer PIXGRO Canopy Day of Year ABA SIGNAL PIXGRO Soil Test Site Hesse.... or Hainich, or Soroe, etc. GPP and Reco GPP (g m -2 d -1 ) Reco (g m -2 d -1 ) Day of Year Precipitation Sum (mm) Test Pixel Input PIXGRO Framework 10x10 km pixel output Matric potential (cm)

100 / 17 = is currently ca. 1 to is really minimal with respect to long-term adjustments and acclimation response Test Pixel Math

subarctic alpine dry deciduous forests shrublands

At these locations, the problem is one of understanding the basic process response for carbon exchange but also water exchange, soil water depletion, and the influences of hydrology and seasonal climate on phenology.

Vegetation, both potential and actual, is the best indicator of process controls. Sample according to vegetation, including the extremes and maxima in development, and particularly interesting regions. Add in landuse change and disturbance and be satisfied for the first project in order to obtain temporal variation.