FREQCOR_LUT_cof

Look-up table construction for cut-off frequencies (cof).

Functions

FREQCOR_LUT_cof

Build the cut-off frequency (cof) look-up table.

Exceptions

FREQCORLUTCofError(message)

Exception raised for errors in FREQCOR_LUT_cof.
exception FREQCOR_LUT_cof.FREQCORLUTCofError(message)[source]

Exception raised for errors in FREQCOR_LUT_cof.

__init__(message)[source]
FREQCOR_LUT_cof.FREQCOR_LUT_cof(sps, gss, classnum_first, classnum_ws, Icon_cof, Rcon_cof, WS, WD, Zeta, meteo_df, nfreq, jtmin_hz, jtmax_hz, varclim, freq, freqn, tfmin_hz, tfmax_hz, plot, outputpath, tf_peltola, run_tag)[source]

Build the cut-off frequency (cof) look-up table.

The routine groups (co)spectra by a first sorting variable (wind direction for CO2 or relative humidity for H2O) and then by wind speed classes. For each class it estimates transfer functions and derives cut-off frequencies stored in a LUT.

Parameters:

  • sps (int) – Approach selector (cospectral or spectral).

  • gss (int) – Gas species selector.

  • classnum_first (int) – Number of classes for the first sorting variable.

  • classnum_ws (int) – Number of wind speed classes.

  • Icon_cof (pandas.DataFrame) – Ideal content (cof) and real content (cof) (co)spectral data (either cospectra or spectra; depends on sps).

  • Rcon_cof (pandas.DataFrame) – Ideal content (cof) and real content (cof) (co)spectral data (either cospectra or spectra; depends on sps).

  • WS (pandas.Series) – Wind speed, wind direction and stability parameter time series.

  • WD (pandas.Series) – Wind speed, wind direction and stability parameter time series.

  • Zeta (pandas.Series) – Wind speed, wind direction and stability parameter time series.

  • meteo_df (pandas.DataFrame) – Half-hourly meteorological and flux data (used for RH when gss == 2).

  • nfreq (int) – Number of frequency bins.

  • jtmin_hz (float) – Frequency range (Hz) used for transfer function normalization.

  • jtmax_hz (float) – Frequency range (Hz) used for transfer function normalization.

  • varclim (float) – Threshold for coefficient of variation of the normalization parameter.

  • freq (pandas.Series) – Natural frequencies (Hz).

  • freqn (pandas.DataFrame) – Normalized frequencies per time step.

  • tfmin_hz (float) – Frequency range (Hz) used for transfer function fitting.

  • tfmax_hz (float) – Frequency range (Hz) used for transfer function fitting.

  • plot (list[int]) – Plotting options selector.

  • outputpath (str) – Output directory.

  • tf_peltola (int) – If 1, use the Peltola et al. (2021) fit form for the transfer function.

  • run_tag (str) – Run identifier used to generate output filenames.

Returns:

  • LUT_cof (dict) – Cut-off frequency look-up table.

  • classize (int) – Number of (co)spectra used per wind speed class.

Raises: