TABLE 4.
Parameter values
| Parameter | Value | Unita | Description |
|---|---|---|---|
| Photosynthesis | |||
| Pm | 3.1438 | mol C · g Chla−1 · h−1 | Maximum gross photosynthesis rate in Trichodesmium (from Kana [27]) |
| aN | 1.5 | g Chl · mol N−1 | Chlorophyll a-to-nitrogen ratio |
| Ik | 100 | μmol phot · m−2 · s−1 | Saturation irradiance for photosynthesis |
| β1 | 350 | μmol phot · m−2 · s−1 | Photoinhibition coefficient for photosynthesis |
| c1 | 0.12 | h−1 | Catabolism rate of Cr |
| c2 | 0.2 | h−1 | Maximum carbon storage rate |
| kC | 0.06 | mol C · mol C−1 | Half-saturation Csm/Ctot ratio for carbon storage |
| N2 fixation and uptake | |||
| c3 | 10 × gm × 24−1 | mol N · mol C−1 · h−2 | Maximum rate of increase of nitrogenase activity related to the maximum specific growth rate (gm) |
| c4 | 8 × gm × 24−1 | mol N · mol C−1 · h−2 | Maximum rate of decay of nitrogenase activity related to the maximum specific growth rate (gm) |
| c5 | 0.0005 | mol N · mol C−1 · h−1 | Coefficient of the decay function g8 |
| c6 | 0.0272 | mol N · mol C−1 · h−1 | Maximum carbon-specific rate of nitrogen uptake |
| kCn | 0.045 | mol C · mol C−1 | Half-saturation Csm/Ctot ratio for the allocation of carbon to nitrogenase synthesis |
| kCf | 0.05 | mol C · mol C−1 | Half-saturation Csm/Ctot ratio for the allocation of carbon to N2 fixation |
| kd | 0.5 | mmol N · m−3 | Half-saturation constant for DIN uptake |
| kN | 0.1 | mol N · mol N−1 | Half-saturation Nr/Ntot ratio for nitrogen storage |
| Growth | |||
| gm | 0.9 × 24−1 | h−1 | Maximum specific growth rate of Trichodesmium |
| (N:C)Nr | 0.4 | mol N · mol C−1 | N-to-C ratio in nitrogen reserves (Nr) |
| (N:C)Cs | 0.3 | mol N · mol C−1 | N-to-C ratio in structural biomass (Cs) |
| QC | 0.03 | mol C · mol C−1 | Minimum cellular C quota (Csm-to-Cs ratio) |
| QN | 0.00 | mol N · mol N−1 | Minimum cellular N quota (Nr-to-Cs ratio) |
| c7 | 0.4 | Highest value in the range of the minimum respiration activity | |
| c8 | 0.2 | Lowest value in the range of the minimum respiration activity | |
| ra2 | 0.45 | Maximum fraction of the gross growth (Cs production) lost as respiration activity | |
| rb | 0.02 × 24−1 | h−1 | Rate of the maintenance cost |
| m | 0.002 × 24−1 | h−1 | Natural mortality rate |
| Forcing functions | |||
| I | 120.0 | μmol phot · m−2 · s−1 | Incident solar irradiance during light hours |
| Ieq | Variable | μmol phot · m−2 · s−1 | Avg irradiance in the culture at the dynamic equilibrium |
| c9 | 0.04 | m−1 | Background light extinction due to suspended material |
| c10 | 0.0088 | Extinction parameter | |
| c11 | 0.054 | Extinction parameter | |
| c12 | 0.667 | Extinction parameter | |
| zm | 1 | m | Maximum depth of the water column |
| D | 0.0085 | h−1 | Dilution rate in the culture |
| c13 | 0.001 | Adjustment coefficient for the dilution rate in the turbidostat |
a
phot, photons.