surface.CO2 {bigleaf} | R Documentation |
CO2 Concentration at the Canopy Surface
Description
the CO2 concentration at the canopy surface derived from net ecosystem CO2 exchange and measured atmospheric CO2 concentration.
Usage
surface.CO2(Ca, NEE, Ga_CO2, Tair, pressure)
Arguments
Ca |
Atmospheric CO2 concentration (umol mol-1) |
NEE |
Net ecosystem exchange (umol CO2 m-2 s-1) |
Ga_CO2 |
Aerodynamic conductance for CO2 (m s-1) |
Tair |
Air temperature (degC) |
pressure |
Atmospheric pressure (kPa) |
Details
CO2 concentration at the canopy surface is calculated as:
Ca_surf = Ca + NEE / Ga_CO2
Note that this equation can be used for any gas measured (with NEE replaced by the net exchange of the respective gas and Ga_CO2 by the Ga of that gas).
Value
Ca_surf - |
CO2 concentration at the canopy surface (umol mol-1) |
Note
the following sign convention is employed: negative values of NEE denote net CO2 uptake by the ecosystem.
Examples
surface.CO2(Ca=400,NEE=-30,Ga_CO2=0.05,Tair=25,pressure=100)
[Package bigleaf version 0.8.2 Index]