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Conversion factors and parameters
Convert | value | 4C variable name
--- | --- | ---
from | to
g/m² | kg/ha | 10.0 | gm2_in_kgha
kg/ha | g/m² | 0.1 | kgha_in_gm2
g/m² | t/ha | 0.01 | gm2_in_tha
t/ha | g/m² | 100.0 | tha_in_gm2
global radiation J/cm² | photosynthetic activ radiation mol/m² |  | gr_in_par
parameter | value | unit | 4C variable name
--- | --- | --- | ---
part of C in biomass | 0.5 | -- | cpart
molar mass of carbon | 12.0 | g/mol | cmass
partial pressure of oxygen | 20.9 | kPa | o2
universal gas constant | 8.314 | J/mol/K | r_gas
von Karman's constant | 0.41 | -- | c_karman
specific heat of air at constant pressure | 1.005 | J/g/K | c_air
psychrometer constant | 0.000662 | hPa/K | psycro
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