A basin scale study of the general circulation and the associated synoptic and mesoscale structures, their variability and their effect on the space-time patterns of primary and secondary production is made with the GHER 3D ecohydrodynamic model. An eddy resolving model with a 5 km horizontal resolution and with 25 vertical levels is used to simulate the typical seasonal cycle. A simple ecosystem model at basin scale is defined by a the nitrogen cycle which is described by 5 state variables i.e. (NO_3)~(-), (NH_4)~(+), Phytoplankton, Zooplankton and Detritus. The simulations are performed on a power parallel system (sp2) using space parallelisation. The results of the model are compared with CZCS data of surface chlorophyll concentrations.
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