openairclim.calc_ch4

Calculates CH4 response

openairclim.calc_ch4.calc_ch4_concentration(config: dict, tau_inverse_dict: dict) → dict[source]

Calculates the methane (CH4) concentration over time based on methane background and inverse methane lifetime of idealized emission boxes.

Parameters:

  • config (dict) – Configuration dictionary from config

  • tau_inverse_dict (dict) – Dictionary of an np.ndarray of inverse lifetime for methane.

Returns:

A dictionary containing the calculated methane concentration for each time step.

The dictionary has a single key “CH4” with corresponding values as a numpy array.

Return type:

dict

openairclim.calc_ch4.calc_ch4_rf(config: dict, conc_dict: dict, conc_ch4_bg_dict: dict, conc_n2o_bg_dict: dict) → dict[source]

Calculates the Radiative Forcing values for emitted CH4 concentrations

Parameters:

  • config (dict) – Configuration dictionary from config

  • conc_dict (dict) – Dictionary with array of concentrations between the starting and ending years, keys is species

  • conc_ch4_bg_dict (dict) – Dictionary of np.ndarray of background CH4 concentrations between the starting and ending years, key is species

  • conc_n2o_bg_dict (dict) – Dictionary of np.ndarray of background N2O concentrations between the starting and ending years, key is species

Raises:

ValueError – if CH4.rf.method not valid

Returns:

Dictionary with np.ndarray of CH4 Radiative Forcing values

between the starting and ending years, key is species CH4

Return type:

dict

openairclim.calc_ch4.calc_ch4_rf_etminan_2016(conc_dict: dict, conc_ch4_bg_dict: dict, conc_n2o_bg_dict: dict) → dict[source]

Calculates the Radiative Forcing values for emitted CH4 concentrations after Etminan, Maryam, et al. Radiative forcing of carbon dioxide, methane, and nitrous oxide: A significant revision of the methane radiative forcing. Geophysical Research Letters 43.24 (2016): 12-614. https://doi.org/10.1002/2016GL071930

Parameters:

  • conc_dict (dict) – Dictionary with array of concentrations between the starting and ending years, keys is species

  • conc_ch4_bg_dict (dict) – Dictionary of np.ndarray of background CH4 concentrations between the starting and ending years, key is species

  • conc_n2o_bg_dict (dict) – Dictionary of np.ndarray of background N2O concentrations between the starting and ending years, key is species

Returns:

Dictionary with np.ndarray of CH4 Radiative Forcing values

between the starting and ending years, key is species CH4

Return type:

dict

openairclim.calc_ch4.calc_pmo_rf(out_dict)[source]

Calculates PMO RF

Parameters:

out_dict (dict) – Dictionary with computed responses, keys are e.g. ‘RF_CH4’

Returns:

Dictionary of np.ndarray of computed RF, key is PMO

Return type:

dict

Raises:

KeyError – If computed CH4 RF is not available.

openairclim.calc_ch4.func_tagging(t, y, ch4_bg, tau_global, tau_inverse)[source]

Differential equation, contribution (tagging) method, for evaluating CH4 concentratrion after equation 4.49 in Rieger, V.S., A new method to assess the climate effect of mitigation strategies for road traffic, Delft University of Technology, PhD, 2018, https://doi.org/10.4233/uuid:cc96a7c7-1ec7-449a-84b0-2f9a342a5be5

Parameters:

  • t (float) – time

  • y (float) – CH4 concentration, tagged, required solution of differential equation

  • ch4_bg (float) – CH4 background concentration

  • tau_global (float) – global CH4 lifetime

  • tau_inverse (float) – inverse CH4 lifetime, tagged

Returns:

d/dt CH4 (CH4 concentration, tagged)

Return type:

float