flux_fitting_zhao18: Fitting a model to the gas concentration curve and estimating...

In fluxible: Ecosystem Gas Fluxes Calculations for Closed Loop Chamber Setup

Fitting a model to the gas concentration curve and estimating the slope over time, using the exponential model from Zhao et al (2018)

Description

Fits an exponential expression to the concentration evolution

Usage

flux_fitting_zhao18(
  conc_df_cut,
  conc_df,
  f_conc,
  f_start,
  f_fluxid,
  start_cut,
  cz_window,
  b_window,
  a_window,
  roll_width
)

Arguments

conc_df_cut	dataframe of gas concentration over time, cut
conc_df	dataframe of gas concentration over time
f_conc	column with gas concentration
f_start	column with datetime when the measurement started
f_fluxid	column with ID of each flux
start_cut	time to discard at the start of the measurements (in seconds)
cz_window	window used to calculate Cz, at the beginning of cut window
b_window	window to estimate b. It is an interval after tz where it is assumed that C fits the data perfectly
a_window	window at the end of the flux to estimate a
roll_width	width of the rolling mean for CO2 when looking for tz, ideally same as cz_window

Value

a dataframe with the slope at t zero, modeled concentration over time and exponential expression parameters

References

Zhao, P., Hammerle, A., Zeeman, M., Wohlfahrt, G., 2018. On the calculation of daytime CO2 fluxes measured by automated closed transparent chambers. Agricultural and Forest Meteorology 263, 267–275. https://doi.org/10.1016/j.agrformet.2018.08.022

fluxible documentation built on June 25, 2025, 1:08 a.m.