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oceanic basis functions
The monthly ocean basis function flux maps represent the oceanic 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 ocean region and particular month combination in which the annual summed flux over a region is equal to 1 Gt C.
There is no spatial distribution to the flux with the exception of seasonal ice cover in those areas for which ice cover occurs (changing ice cover is the motivation for monthly maps). The sea ice cover data comes from the boundary conditions used by World Climate Research Programme, Working Group on Numerical Experimentation, Atmospheric Model Intercomparison Project (AMIP). Reference: Taylor, K.E., D. Williamson and F. Zwiers, "The sea surface temperature and sea ice concentration boundary conditions for AMIP II simulations" PCMDI Report, in preparation. URL:
The original ice cover 1 x 1 degree maps were subsampled to 0.5 x 0.5 degree maps in order to create regional/monthly unit fluxes. The first grid cell is centered at 89.75 S latitude, 179.75 W longitude, proceeding in the longitudinal direction.
The January North Pacific Temperate basis function, the global July and January sea ice maps are shown below:
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