slopes0_flag {fluxible} | R Documentation |
Slopes for each flux
Description
Slopes of C(t) for each flux with 0 second cut, with quality flags.
Usage
slopes0_flag
Format
A tibble with 1251 rows and 36 variables
- datetime
Datetime at which CO2 concentration was recorded.
- temp_air
Air temperature inside the flux chamber in Celsius.
- temp_soil
Ground temperature inside the flux chamber in Celsius.
- f_conc
CO2 concentration in ppm.
- PAR
Photosynthetically active radiation inside the chamber in micromol/s/sqm.
- turfID
Unique ID of the turf in which the measurement took place.
- type
Type of measurement: ecosystems respiration (ER) or net ecosystem exchange (NEE).
- start
Datetime at which the measurement was started.
- end
Datetime at which the measurement ended.
- f_fluxID
Unique ID for each flux.
- n_conc
Number of data point per flux.
- ratio
Ratio of n_conc over length of the measurement (in seconds).
- flag
Data quality flags.
- f_time
Time variable of the flux in seconds.
- f_cut
Indicating if the measurement should be kept (keep) or discarded (cut).
- Cm_est
Estimation of the Cm parameter.
- a_est
Estimation of the a parameter.
- b_est
Estimation of the b parameter.
- tz_est
Estimation of the tz parameter.
- Cz
Cz parameter of the C(t) function.
- Cm
Cm parameter of the C(t) function, calculated by optim() with Cm_est as starting point.
- a
a parameter of the C(t) function, calculated by optim() with a_est as starting point.
- f_b
b parameter of the C(t) function, calculated by optim() with b_est as starting point.
- tz
tz parameter of the C(t) function, calculated by optim() with tz_est as starting point.
- f_slope
Slope of C(t) at tz
- f_fit
C(t), modeled CO2 concentration as a function of time.
- fit_slope
Output of linear model of CO2 concentration passing by C(tz) and a slope of slope_tz.
- start_z
Datetime format of tz
- f_cor_coef
coefficient of correlation between gas concentration and time
- f_RMSE
RMSE of the exponential fit and the measured data
- f_start_error
flagging if measurement started outside of the possible ambient concentration
- f_fit_quality
flagging bad fit
- f_correlation
flagging if there is a correlation between gas concentration and time
- f_quality_flag
quality flag advising if the slope has to be replaced by 0 or NA
- f_slope_corr
slope corrected according to quality flag
Examples
slopes0_flag