slopes30qua {fluxible}R Documentation

Slopes for each flux

Description

Slopes of quadratic fit for each flux with 30 seconds end cut and t_zero of 10 seconds, without quality flags. C(t) = a + bt + ct^2

Usage

slopes30qua

Format

A tibble with 1251 rows and 27 variables

f_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).

f_start

Datetime at which the measurement was started.

f_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).

f_pvalue

P-value of the quadratic model of gas concentration over time.

f_rsquared

R squared of the quadratic model of gas concentration over time.

f_adj_rsquared

Adjusted R squared of the quadratic model of gas concentration over time.

f_intercept

Intercept of the quadratic model of gas concentration over time.

f_param1

b parameter of C(t)

f_param2

c parameter of C(t)

f_slope

Slope of the quadratic model of gas concentration over time at t_zero.

f_fit

Output of the quadratic model of gas concentration over time.

f_fit_slope

output of linear expression describing the slope at t_zero

Examples

slopes30qua

[Package fluxible version 0.0.1 Index]