The primary production module in the marine ecosystem model ERSEM II, with emphasis on the light forcing

Abstract New elements in the primary production module of ERSEM II relative to ERSEM I are described. The main changes are the inclusion of picoalgae and dinoflagellates as additional functional groups, the decoupling of carbon- and nutrient-uptake kinetics and the refining of the light dependency of the primary producers, with emphasis on the last. The results of a reference run are compared with measurements. The consequences of using production-irradiance ( p I ) relations assuming a different degree of photoinhibition in calculating net annual primary production are shown in a sensitivity analysis, and it is concluded that a p I relation with a high degree of photoinhibition leads to clear underestimates of primary production in turbid coastal waters.

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