calculate_flux

Calculate linear rate of change in CO2, CH4, and/or N2O for each flux interval

Usage

calculate_flux(data_small, cutoff_start, cutoff_end, group_cols = NULL)

Arguments

data_small

dataset. Must contain columns for Chamber, TIMESTAMP, and CH4d_ppm/CO2d_ppm/N2Od_ppm

cutoff_start

Amount of time to remove after the start of the flux interval (in seconds)

cutoff_end

End of flux, as determined from the start of the flux interval (in seconds)

group_cols

Optional grouping variable. See details

Value

Dataframe of calculated fluxes

Details

This function calculates the linear rate of change in gas (CO2, CH4, and/or N2O) concentrations. The function requires a dataframe of input data that contains columns for gas concentrations (in ppm), timestamps, and a column with the chamber index. By default, fluxes are grouped by timestamp and chamber index, but additional grouping columns can be identified in group_cols (e.g., if data from multiple gas analyzers are combined in data_small)