Table 1: Mathematical description of various processes involved in (1).

Process Mathematical formulation References

Atmosphere-water surface exchange [1, 4, 5, 10, 11, 15, 18]
Photosynthesis [1, 5, 10, 15, 37]
Nitrification [15, 18]
Respiration [1, 10]
Mineralisation [37]
Loss due to other processes