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The ROMS modeling system was applied to the California Upwelling System(CalUS) to understand the key hydrodynamic conditions and dynamics of thenitrogen-based ecosystem using the NPZD model proposed by Powell et al. (2006).A new type of sponge layer has been successfully implemented in the ROMSmodelling system in order to stabilize the hydrodynamic part of the modelingsystem when using so-called reduced boundary conditions. The hydrodynamicperformance of the model was examined using a tidal analysis based on tidalmeasurement data, a comparison of the modeled sea surface temperature (SST)with buoy and satellite data, and vertical sections of the currents along thecoast and the water temperature. This validation process shows that thehydrodynamic module used in this study can reproduce the basic hydrodynamic andcirculation characteristics within the CalUS. The results of the ecosystemmodel show the characteristic features of upwelling regions as well as thewell-known spotty horizontal structures of the zooplankton community. The modelthus provides a solid basis for the hydrodynamic and ecological characteristicsof the CalUS and enables the ecological model to be expanded into a complexecological model for investigating the effects of climate change on theecological balance in the area investigated.

A modelling study of hydrodynamical and biogeochemical processes within the California Upwelling System