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

[Package fluxible version 0.0.1 Index]