conc_to_flux: Convert change in gas concentration over time to flux

In jpshanno/ecoflux: Functions for ecological flux studies including sap flux and soil/stem C efflux.

Description

This function uses the ideal gas law to convert changes in concentration within a sample chamber to flux rates for the gas species or for carbon. Conversion uses the ideal gas law to determine the convert the change in concentration to the change in mass.

Usage

conc_to_flux(delta.gas.ppm, chamber.volume.cm3, collar.area.cm2, temperature.k,
  pressure.pa, species, input.time, output.units = "g/m2d1", C.only = FALSE,
  delta.ppm = NULL)

Arguments

delta.gas.ppm	A vector of slopes representing the change in concentration over time
chamber.volume.cm3	The gas chamber volume in cm^3; can be a vector of the same length as delta.ppm or a single numeric value
collar.area.cm2	The area of the chamber footprint in cm^2; can be a vector of the same length as delta.ppm or a single numeric value
temperature.k	The temperature within the chamber in Kelvin; can be a vector of the same length as delta.ppm or a single numeric value
species	The gas species of interest; 'CO2', 'CH4', or 'N2O'
input.time	The time scale for delta.ppm; either 'seconds' or 'minutes'
C.only	A logical specificying if the output flux should be calculated for the gas species or for carbon only; defaults to FALSE
delta.ppm	Deprecated, use delta.gas.ppm
pressure.Pa	The pressure within the chamber in Pascals;; can be a vector of the same length as delta.ppm or a single numeric value
ouput.units	The desired output flux units; 'g/m2h1', 'mg/m2h1', 'g/m2d1', or 'mg/m2d1'; defaults to 'g/m2h1'

Value

A vector giving flux of the gas species or of carbon in the selected output units

jpshanno/ecoflux documentation built on May 19, 2019, 11:51 p.m.