Arguments
ct
Concentration of the gas at time t. When the function is used internally the concentration is automatically derived from a regression model. May also be the concentration change in time dc/dt. In this case c0 must not be specified.
c0
Concentration of the gas at time 0. When the function is used internally the concentration is automatically derived from a regression model.
T
Temperature within the chamber during the measurement in $^{\circ}$C (it is converted automatically to Kelvin). When it is changing during the measurement typically the average temperature is used. However, if there is too much change in temperature durin
V
Chamber headspace volume. Because concentrations are typically small volume matters and should therefore be determined as exactly as possible.
A
Area covered by the measurement chamber. Defaults to 1. For dimensionless sampling just leave the default. As with the volume it matters a lot for the end value, therefore it should be determined as exactly as possible.
M
Molar weight of the gas for wich concentration data is given. Defaults to 44 because two of the three most commonly considered greenhouse gases share this molar weight ($N_2O$ and $CO_2$). When calculating the flux rate from methane concentrations change
t
Chamber closing time or more exactly the time span between the measurement of c0 and ct. When derived from a regression model this might not be the whole chamber closing time.
p
The air pressure at earth surface during measurements. Default is given by the standard value at sea level of 101325 Pa. Should be OK for most lowland measurements. However, if the measurements took place on higher altitudes, it might be reasonable to ada