A biogeochemical model is a numerical model that try to schematize environmental and biological processes using mathematical equations. Based on assumptions they can help us to understand certain behaviour, processes or fluxes of nutrients within a numerical environment. Each biogeochemical model has its own advantages and drawbacks accordingly to their assumptions and structures. The biology of these model is usually represented by a NPZD model (nutrients, phytoplankton, zooplankton and detritus). One drawback of such models is that they usually tend to oversimplify the zooplankton compartment, using it only as an exit terms for the phytoplankton. The model that we selected allowed us to produce several size-classes of both micro- and mesozooplankton. Another drawback is that usually the grazing pressure on the phytoplankton is constant throughout the year in such models. This would not be representative of the arctic pelagic ecosystem since most of its mesozooplankton goes into diapause which modulate their pressure over their planktonic preys throughout the year.