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Slopes of linear fit for each flux with 30 seconds end cut, with quality flags.

Usage

slopes30lin_flag

Format

A tibble with 1251 rows and 22 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.

time

Time variable of the flux in seconds.

cut

Indicating if the measurement should be kept (keep) or discarded (cut).

f_pvalue

P-value of the linear model of CO2 concentration over time.

f_rsquared

R squared of the linear model of CO2 concentration over time.

adj.r.squared

Adjusted R squared of the linear model of CO2 concentration over time.

intercept

Intercept of the linear model of CO2 concentration over time.

f_slope

Slope of the linear model of CO2 concentration over time.

fit

Output of the linear model of CO2 concentration over time.

f_start_error

flagging if measurement started outside of the possible ambient concentration

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

slopes30lin_flag
#> # A tibble: 1,251 × 27
#>    f_datetime          temp_air temp_soil f_conc   PAR turfID       type 
#>    <dttm>                 <dbl>     <dbl>  <dbl> <dbl> <fct>        <fct>
#>  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 20 more variables: f_start <dttm>, f_end <dttm>, f_fluxID <fct>,
#> #   n_conc <dbl>, ratio <dbl>, flag <chr>, f_time <dbl>, f_cut <fct>,
#> #   f_pvalue <dbl>, f_rsquared <dbl>, f_adj_rsquared <dbl>, f_intercept <dbl>,
#> #   f_slope <dbl>, f_fit <dbl>, f_n_conc <int>, f_ratio <dbl>,
#> #   f_flag_ratio <chr>, f_start_error <chr>, f_quality_flag <chr>,
#> #   f_slope_corr <dbl>