NPZ-model/Physical-Processes.md

@@ -40,20 +40,21 @@ It is assumed that about 50% of the light is photosynthetic active radiation (PA
 PAR = 0.5 \cdot I_{avg}
 ```
 
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 # SinkPhy
 The phytoplankton sinks to the sea floor with a constant sinking velocity ($`SinkinRate_{Phy}`$)[m d<sup>-1</sup>]. The units of SinkPhy is [mmol-N m<sup>-2</sup> d<sup>-1</sup>].
 ```math
 SinkPhy = SinkingRate_{Phy}\cdot\ Phyto
 ```
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 # SinkDet
 The detritus sinks to the sea floor with a constant sinking velocity ($`SinkinRate_{Det}`$)[m d<sup>-1</sup>]. The units of SinkDet is [mmol-N m<sup>-2</sup> d<sup>-1</sup>].
 ```math
 SinkDet = SinkingRate_{Det}\cdot\ Det
 ```
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 # Transport
 State variables in the water column (DIN, Phyto, Zoo and Det) are transported by tidal currents. This transport is modeled as exchange rates between the neighboring compartments. It is assumed that the exchange rates are bi-directional, i.e. the exchange rate [m<sup>3</sup> d<sup>-1</sup>] from compartment $`i`$ to compartment $`j`$ is the same as the exchange rate from compartment $`j`$ to $`i`$.