Slopes for each flux
slopes0.RdSlopes of C(t) for each flux without cut.
Format
A tibble with 1251 rows and 28 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.
- 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.
- 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.
- time
Time variable of the flux in seconds.
- 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.
- 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.
- slope_tz
Slope of C(t) at tz
- 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
Examples
slopes0
#> # A tibble: 1,251 × 29
#> f_datetime temp_air temp_soil f_conc PAR turfID type
#> <dttm> <dbl> <dbl> <dbl> <dbl> <chr> <chr>
#> 1 2022-07-28 23:43:35 NA NA 447. NA 156 AN2C 156 ER
#> 2 2022-07-28 23:43:36 7.22 10.9 447. 1.68 156 AN2C 156 ER
#> 3 2022-07-28 23:43:37 NA NA 448. NA 156 AN2C 156 ER
#> 4 2022-07-28 23:43:38 NA NA 449. NA 156 AN2C 156 ER
#> 5 2022-07-28 23:43:39 NA NA 449. NA 156 AN2C 156 ER
#> 6 2022-07-28 23:43:40 NA NA 450. NA 156 AN2C 156 ER
#> 7 2022-07-28 23:43:41 NA NA 451. NA 156 AN2C 156 ER
#> 8 2022-07-28 23:43:42 NA NA 451. NA 156 AN2C 156 ER
#> 9 2022-07-28 23:43:43 NA NA 453. NA 156 AN2C 156 ER
#> 10 2022-07-28 23:43:44 NA NA 453. NA 156 AN2C 156 ER
#> # ℹ 1,241 more rows
#> # ℹ 22 more variables: f_start <dttm>, f_end <dttm>, f_fluxID <dbl>,
#> # n_conc <dbl>, ratio <dbl>, flag <lgl>, f_time <dbl>, f_cut <chr>,
#> # Cm_est <dbl>, a_est <dbl>, b_est <dbl>, tz_est <dbl>, f_Cz <dbl>,
#> # time_diff <dbl>, f_Cm <dbl>, f_a <dbl>, f_b <dbl>, f_tz <dbl>,
#> # f_slope <dbl>, f_fit <dbl>, f_fit_slope <dbl>, f_start_z <dttm>