Where T is the ambient water temperature and $`Q_{10}`$ indicates the relative increase in the rate for an increase of the water temperature with 10 °C.
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# Underwater light conditions
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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>].
Where $`Flux_{i,j}`$ is the increase in concentration in compartment $`i`$ [mmol-N m<sup>-3</sup> d<sup>-1</sup>] due to the water exchange between compartment $`i`$ and $`j`$. $`Ex_{i,j}`$ is the exchange rate between compartment $`i`$ and $`j`$ [m<sup>3</sup> d<sup>-1</sup>]. $`C_{i}`$ and $`C_{j}`$ are the concentrations of the state variables in compartment $`i`$ and $`j`$ [mmol-N m<sup>-3</sup>], respectively. $`Vol_{i}`$ is the volume of compartment $`i`$ [m<sup>3</sup>].