surface.CO2 {bigleaf}

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)