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sf6 basis functions
The sf6 basis function flux maps will be used to invert for a flux whose global distribution is relatively well-known. The same 11 land basis function regions used for the unit carbon fluxes are utilized in the sf6 flux maps. Each map represents a particular land region in which the annual summed flux over the region is equal to 1 Gg sf6/year.
The spatial distribution of the sf6 flux is similar to that used for the TransCom 2 experiment. In this experiment, the spatial distribution has been scaled such that the flux in each basis function region sums to 1 Gg sf6/year.
The spatial distribution of the sf6 flux was constructed as described in Denning et al. 1999 (TransCom 2 paper in Tellus).
The sf6 flux from the Europe basis function is shown below:
 
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