Appendix: Gas-Flux Model Variables
General Input Variables Read Once for Each Diurnal Simulation
Barometric pressure [mbar]
Albedo of ground
Ambient CO2 [ppm]
Julian day
Latitude of site [degrees]
Indicator of clear or overcast sky
Soil water content at O-lOcm depth [% of dry weight]
Depth to permafrost [cm]
Depth of water table [cm]
Extinction coefficient of the moss
Number of moss layers
Water content of the moss [% of dry weight]
Moss bulk density [gcm- 3 ]
Percentage of moss cover on the ground [%]
Initial simulation time [hour]
Final simulation time [hour]
Time step [hour]
Time that solar noon occurs in the input data [hour]
Number of canopy layers
Number of species in the simulation
Number of stem diameter classes
Species identification number for each layer
Input Variables Specific for Each Canopy Layer
Leaf absorptance for photosynthetic photon flux density [PPFD]
Leaf reflectance for PPFD
Leaf transmittance for PPFD
Leaf absorptance for shortwave radiation
Leaf reflectance for shortwave radiation
Leaf transmittance for shortwave radiation
Leaf absorptance for infra-red radiation
Projected leaf area [m 2 /m 2 ]
Mean leaf angle [degrees]
Leaf clustering factor
Portion of leaves that are live
Width of average leaf [cm]
Convective heat coefficient
Stem area index [m 2 /m 2 ]
Stem inclination angle [degrees]
Stem clustering factor