AtmFieldsCalc

Interpolation of raw atmospheric T, z, VMR, and NLTE T/r fields to calculation grids.

An atmospheric scenario includes the following data for each position (pressure, latitude, longitude) in the atmosphere:

temperature field
the corresponding altitude field
vmr fields for the gaseous species

This method interpolates the fields of raw data (t_field_raw, z_field_raw, vmr_field_raw) which can be stored on arbitrary grids to the calculation grids (p_grid, lat_grid, lon_grid). If nlte_field_raw is empty, it is assumed to be so because LTE is assumed by the user and nlte_field will be empty.

Internally, AtmFieldsCalc() applies GriddedFieldPRegrid() and GriddedFieldLatLonRegrid(). Generally, ‘half-grid-step’ extrapolation is allowed and applied. However, if vmr_zeropadding=1 then VMRs at p_grid levels exceeding the raw VMRs’ pressure grid are set to 0 (applying the vmr_zeropadding option of GriddedFieldPRegrid()).

Default is to just accept obtained VMRs. If you want to enforce that all VMR created are >= 0, set vmr_nonegative to 1. Negative values are then set 0. Beside being present in input data, negative VMR can be generated from the interpolation if interp_order is above 1.

Author(s): Claudia Emde, Stefan Buehler

Parameters:

t_field (Tensor3, optional) – The field of atmospheric temperatures. See t_field, defaults to self.t_field [OUT]
z_field (Tensor3, optional) – The field of geometrical altitudes. See z_field, defaults to self.z_field [OUT]
vmr_field (Tensor4, optional) – VMR field. See vmr_field, defaults to self.vmr_field [OUT]
nlte_field (EnergyLevelMap, optional) – The field of NLTE temperatures and/or ratios. See nlte_field, defaults to self.nlte_field [OUT]
p_grid (Vector, optional) – The pressure grid. See p_grid, defaults to self.p_grid [IN]
lat_grid (Vector, optional) – The latitude grid. See lat_grid, defaults to self.lat_grid [IN]
lon_grid (Vector, optional) – The longitude grid. See lon_grid, defaults to self.lon_grid [IN]
t_field_raw (GriddedField3, optional) – Raw data for atmospheric temperatures. See t_field_raw, defaults to self.t_field_raw [IN]
z_field_raw (GriddedField3, optional) – Raw data for geometrical altitudes. See z_field_raw, defaults to self.z_field_raw [IN]
vmr_field_raw (ArrayOfGriddedField3, optional) – VMR data for the chosen gaseous species. See vmr_field_raw, defaults to self.vmr_field_raw [IN]
nlte_field_raw (ArrayOfGriddedField3, optional) – Raw data for NLTE temperatures and/or ratios. See nlte_field_raw, defaults to self.nlte_field_raw [IN]
nlte_level_identifiers (ArrayOfQuantumIdentifier, optional) – An array of non-lte quantum identifiers for levels matching. See nlte_level_identifiers, defaults to self.nlte_level_identifiers [IN]
nlte_vibrational_energies (Vector, optional) – An list of vibrational energies matching. See nlte_vibrational_energies, defaults to self.nlte_vibrational_energies [IN]
atmosphere_dim (Index, optional) – The atmospheric dimensionality (1-3). See atmosphere_dim, defaults to self.atmosphere_dim [IN]
interp_order (Index, optional) – Interpolation order (1=linear interpolation). Defaults to 1 [IN]
vmr_zeropadding (Index, optional) – Pad VMRs with zeroes to fit the pressure grid if necessary. Defaults to 0 [IN]
vmr_nonegative (Index, optional) – If set to 1, negative VMRs are set to 0. Defaults to 0 [IN]
nlte_when_negative (Index, optional) – -1: Skip step. 0: Negative is 0. Else: Negative is t. Defaults to 0 [IN]
verbosity (Verbosity) – ARTS verbosity. See verbosity, defaults to self.verbosity [IN]