EN
The method discussed in this article allows the simulated in situ primary production in the southern Baltic to be evaluated.T o estimate the daily primary production at a given field station, the following parameters have to be measured: the coefficients AN and Es (constants from the photosynthesis-light curve for phytoplankton), and the scalar irradiance attenuation coefficient (k), chlorophyll a concentration (Chl) and daily irradiation just below the sea surface (PAR).T he results of simulated in situ primary production are in good agreement with the in situ measurements.