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Workspace Method abs_lookupSetup

Description

Set up input parameters for abs_lookupCalc.

More information can be found in the documentation for method
abs_lookupSetupBatch

Max and min values of H2O and temperature are adjusted to allow for
numerical perturbations in Jacobian calculation.

The input variables abs_nls_interp_order and abs_t_interp_order
are used to make sure that there are enough points in abs_nls_pert
and abs_t_pert for the chosen interpolation order.

Note: For homogeneous 1D cases, it can be advantageous to calculate
abs_lookup from the 1D atmosphere, and to expand the atmosphere
to 3D only after that. This particularly if nonlinear species
(i.e., H2O) are involved.
See also:
   abs_lookupSetupBatch

Authors: Stefan Buehler

Synopsis

abs_lookupSetup(

abs_p, abs_t, abs_t_pert, abs_vmrs, abs_nls, abs_nls_pert, atmosphere_dim, p_grid, t_field, vmr_field, atmfields_checked, abs_species, abs_p_interp_order, abs_t_interp_order, abs_nls_interp_order, p_step, t_step, h2o_step )

Variables

OUT	abs_p	(Vector)	List of pressures to be used for the calculation of absorption coefficients.
OUT	abs_t	(Vector)	List of temperatures to be used for the calculation of absorption coefficients.
OUT	abs_t_pert	(Vector)	Temperature perturbations for the absorption lookup table.
OUT	abs_vmrs	(Matrix)	The VMRs (unit: absolute number) on the abs_p grid.
OUT	abs_nls	(ArrayOfArrayOfSpeciesTag)	Nonlinear species for absorption lookup table generation.
OUT	abs_nls_pert	(Vector)	Fractional perturbations for the nonlinear species in the absorption lookup table.
IN	atmosphere_dim	(Index)	The atmospheric dimensionality (1-3).
IN	p_grid	(Vector)	The pressure grid.
IN	t_field	(Tensor3)	The field of atmospheric temperatures.
IN	vmr_field	(Tensor4)	VMR field.
IN	atmfields_checked	(Index)	OK-flag for atmospheric grids and (physical) fields.
IN	abs_species	(ArrayOfArrayOfSpeciesTag)	Tag groups for gas absorption.
IN	abs_p_interp_order	(Index)	The interpolation order to use when interpolating absorption between pressure levels.
IN	abs_t_interp_order	(Index)	The interpolation order to use when interpolating absorption between the temperature values given by abs_t_pert.
IN	abs_nls_interp_order	(Index)	The interpolation order to use when interpolating absorption between the H2O values given by abs_nls_pert.
GIN	p_step	(Numeric, Default: 0.05)	Maximum step in log10(p[Pa]). If the pressure grid is coarser than this, additional points are added until each log step is smaller than this.
GIN	t_step	(Numeric, Default: 100)	The temperature variation grid step in Kelvin, for a 2D or 3D atmosphere. For a 1D atmosphere this parameter is not used.
GIN	h2o_step	(Numeric, Default: 100)	The H2O variation grid step [fractional], if H2O variations are done (which is determined automatically, based on abs_species and the atmospheric dimension). For a 1D atmosphere this parameter is not used.