flux_fitting | R Documentation |
Fits gas concentration over time data with a model (exponential, quadratic or linear) and provides the slope later used to calculate gas fluxes with flux_calc
flux_fitting(
conc_df,
f_conc = f_conc,
f_datetime = f_datetime,
f_start = f_start,
f_end = f_end,
f_fluxid = f_fluxid,
fit_type,
start_cut = 0,
end_cut = 0,
t_zero = 0,
cz_window = 15,
b_window = 10,
a_window = 10,
roll_width = 15
)
conc_df |
dataframe of gas concentration over time |
f_conc |
column with gas concentration data |
f_datetime |
column with datetime of each concentration measurement
Note that if there are duplicated datetime in the same |
f_start |
column with datetime when the measurement started ( |
f_end |
column with datetime when the measurement ended ( |
f_fluxid |
column with ID of each flux |
fit_type |
|
start_cut |
time to discard at the start of the measurements (in seconds) |
end_cut |
time to discard at the end of the measurements (in seconds) |
t_zero |
time at which the slope should be calculated
(for |
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 the model fits the data perfectly
( |
a_window |
window at the end of the flux to estimate a
( |
roll_width |
width of the rolling mean for gas concentration when
looking for |
a dataframe with the slope at t zero (f_slope
),
a datetime column of t zero (f_start_z
), a factor column indicating the
cuts (f_cut
), the time in seconds since the start of the measurement
(f_time
), the modeled fit (f_fit
), the modeled slope (f_fit_slope
),
the parameters of the fit depending on the model used,
and any columns present in the input.
The type of fit is added as an attribute for use by the other functions.
Pedersen, A.R., Petersen, S.O., Schelde, K., 2010. A comprehensive approach to soil-atmosphere trace-gas flux estimation with static chambers. European Journal of Soil Science 61, 888–902. https://doi.org/10.1111/j.1365-2389.2010.01291.x
Hutchinson, G.L., Mosier, A.R., 1981. Improved Soil Cover Method for Field Measurement of Nitrous Oxide Fluxes. Soil Science Society of America Journal 45, 311–316. https://doi.org/10.2136/sssaj1981.03615995004500020017x
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
data(co2_conc)
flux_fitting(co2_conc, conc, datetime, fit_type = "exp_zhao18")
flux_fitting(co2_conc, conc, datetime, fit_type = "quadratic",
t_zero = 10, end_cut = 30)
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