Chlorophyll sounding data in the bio-optical model of the Gulf of Gdansk spring bloom

In this study we propose a model of phytoplankton population dynamics in a marine ecosystem which include physical, biological, and bio-optical parts. We discuss two different methods of contact chlorophyll observation assimilation to fit a model of `in situ' data. As an example we simulate the abnormal 1993 Gulf of Gdansk spring bloom during which extremely high chlorophyll concentration were observed. The data assimilation approach serves as a basis for more adequate underwater light field simulations.