Recent improvements in satellite remote sensing technology have made it possible to understand the physical conditions on the sea surface layer such as the sea surface temperature, sea surface height, etc., and to estimate the primary productivity and size-based distribution of phytoplankton. On the other hand, the structure of the food web is very complicated when we focus on the marine ecosystem and its biogeochemical cycle. Furthermore, biological samples are often limited in time and spatial resolution because sampling is mainly obtained by research vessels. There are many advantages to use ecosystem and biological models that can analyze marine ecosystems with uniform spatial and temporal resolution. In this paper, we reviewed the nitrogen-based model and described the reason why the nitrogen-based model became popular. Finally, suggestions for future works are described.
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