The mineralisation of detritus is described as a first-order function with a first-order rate constant $`r_{Det}`$ The mineralisation rate increases with water temperature.
```math
Mineralization = (r_{Det} \cdot Det \cdot T_{fac}
```
[top](NPZ model/Biological Processes)# DINupMPB
[top](NPZ model/Biological Processes)
# DINupMPB
DINupMPB is the production of microphytobenthos [mmolN m<sup>-2</sup> d<sup>-1</sup>]. It is assumed that microphytobenthos only occurs at the intertidal areas. DINupMPB is depending on the irradiation, water temperature, the nutrient concentration (DIN) and the microphytobenthos concentration.
Mean daily irradiation at the water surface [W d<sup>-1</sup>] is derived from the file KNMI measurements (stored in “./DataOS/KNMI/”).
It is assumed that about 50% of the light is photosynthetic active radiation (PAR)