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Workspace Method abs_scalar_gasExtractFromLookup
Description
Extract scalar gas absorption coefficients from lookup table.
This extracts the absorption coefficient for all species in the
current calculation from the lookup table. Extraction is for one
specific atmospheric condition, i.e., a set of pressure, temperature,
VMR values, and Doppler shift.
Extraction can be either for a single frequency (f_index>=0), or for
all frequencies (f_index<0). The dimension of the output
abs_scalar_gas is adjusted accordingly.
The interpolation order in T and H2O is given by abs_t_interp_order
and abs_nls_interp_order, respectively.
Note that the treatment of the Doppler-shift here is approximate, since
there is a linear interpolation of absorption to a shifted frequency grid.
Due to this, with Doppler shift there will be an extrapolation on one edge
of the grid, where the spectrum is pushed out of the calculated range.
Use extpolfac to control how much extrapolation to tolerate before throwing
a runtime error. Default is to allow ten times the outermost grid distance.
See also: abs_scalar_gasCalcLBL.
Authors: Stefan Buehler
Synopsis
| abs_scalar_gasExtractFromLookup( | abs_scalar_gas, abs_lookup, abs_lookup_is_adapted, abs_p_interp_order, abs_t_interp_order, abs_nls_interp_order, f_index, rte_pressure, rte_temperature, rte_vmr_list, rte_doppler, extpolfac ) |
Variables