The Oder Estuary - IOW

processes, as it is in the case of nutrient recycling in sediment, also fast pelagic nutrient turnover
due to zooplankton grazing, phyto- and zooplankton nutrient excretion and dead cell lyses.
Mineralization in water column
Mineralization Ndet = coeff_min x 1.12 (Temp-20) x Ndet
Mineralization Pdet = coeff_min x 1.12 (Temp-20) x Pdet
coeff_min N = coeff_min P = 0.1 per day at 20 o C
Mineralization in sediment
Mineralization Nsed = coeff_min_sed x 1.12 (Temp-20) x Nsed
Mineralization Psed = coeff_min_sed x 1.12 (Temp-20) x Psed
coeff_min_sed N = coeff_min_sed P = 0.01 per day at 20 o C
2.3.9 Nutrient burial in sediment
Nitrogen and phosphorus in sediment are divided into two pools: one is an active layer which takes
part in the remineralization processes and there is also inactive part which is a result of burial
removing nutrients from the system permanently. Values of burial coefficients were calibrated in
the model after calibration of all other nutrient fluxes in sediment. The same burial ratio is used for
nitrogen and phosphorus but there is a difference between the Grosses Haff and the Kleines Haff.
Burial N = coeff_burial N x Nsed
Burial P = coeff_burial P x Psed
Grosses Haff coeff_burial N = 0.002 per day
coeff_burial P = 0.002 per day
Kleins Haff coeff_burial N = 0.0005 per day
2.3.10 Denitrification
coeff_burial P = 0.0005 per day
The denitrification coefficient was calibrated within the model. Only denitrification in sediment is
considered in the model and 50% of the nitrogen flux form mineralization in sediment is
denitrified. Due to lack of the data on denitrification flux in the in the Lagoon water column and
sediments this is a very coarse assumption but a general structure of the model did not allow for
more specific calibration of this process.
coeff_denitr = 0.5
Denitrification = coeff_denitr x Mineralization Nsed
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