Outputs

This page describes generated outputs (CSV tables, LUTs, corrected fluxes, and diagnostic figures).

Output folder structure

Outputs are written to the folder configured by output_path. In the repository example run, outputs are available under:

examples/output/

Filenames include a site name and run metadata (gas, workflow, time window, timestamp).

CSV outputs

The following CSV files are typically produced.

Cut-off frequency LUT

4_LUT_cof__<site>__<gas>__<mode>__... .csv

This table stores the cut-off frequency look-up table used by the workflow. In the example run it contains one row per wind-direction / wind-speed class (depending on configuration), with columns such as:

wd_mean, wd_max, unc_wdclass
ws_mean, ws_max
cof_L, cof_G: cut-off frequencies for the Lorentzian / Gaussian transfer-function fits
fn_L, fn_G: normalized frequencies
unc_L_tf, unc_G_tf: transfer-function-related uncertainty on the fitted cut-off frequencies (per class)

Mean (co)spectra

4_mean_cosp__<site>__<gas>__<mode>__... .csv

This table stores averaged (co)spectra per class and frequency bin. It is primarily used for diagnostics and plotting.

Correction factor LUT

5_LUT_CF__<site>__<gas>__<mode>__... .csv

This table stores correction factors (stable/unstable) aggregated by class. In the example output, the file contains two blocks (unstable then stable), each providing (among others):

wd_mean, ws_mean
CF_L, CF_G: correction factors for Lorentzian / Gaussian approaches
unc_L_tf, unc_G_tf: transfer-function-related uncertainty component (computed as the maximum deviation from the central CF value “M”)
unc_L_sd, unc_G_sd: within-class spread of CF values (standard deviation computed after outlier removal)

Note: total uncertainties are not written to the output anymore; users can recompute them as needed from the component uncertainties.

Corrected flux output

6_flux_out__<site>__<gas>__<mode>__... .csv

This is the main half-hourly output time series. In the example output it includes:

Timestamp
meteorological descriptors used for classification (e.g. wind_speed (m s-1), wind_dir (deg), (z-d)/L (-))
original flux columns (e.g. Fc (µmol m-2 s-1), FcEP (µmol m-2 s-1))
corrected fluxes (e.g. FCcorL, FCcorG)
correction factors applied (CF_L, CF_G)

Diagnostic figures

When plotting is enabled, FREQCOR generates diagnostic figures to help evaluate selection steps, transfer function fitting, LUT construction, and correction-factor behavior.

The following figures are shown from the example BE-Lon CO2 cospectral run.

Individual (co)spectra

This figure shows individual (co)spectra contributing to the computation (after initial selection), used to evaluate variability and potential outliers.

Individual cospectra (example output)