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terrestrial basis functions
The terrestrial carbon basis function flux maps represent the terrestrial portion of the normalized surface fluxes. These are the fluxes that are "adjusted" in the inverse portion of the TransCom 3 experiment in order to minimize the difference between the observed and simulated tracer concentrations. Each map represents a particular terrestrial region in which the annual summed flux over the region is equal to 1 Gt C/year. The flux from grid cells outside of a particular region is zero. The spatial distribution of the flux reflects annual mean NPP distribution as provided by a steady-state run of the model CASA (contact Jim Randerson, for more information on the NPP map).
The original NPP 1 x 1 degree maps were subsampled to 0.5 x 0.5 degree maps in order to create regional unit fluxes. The first grid cell is centered at 89.75 S latitude, 179.75 W longitude, proceeding in the longitudinal direction.
The North American Temperate basis function and the NPP map are shown below:
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