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Workspace Method abs_fieldCalc

Description

Calculate scalar gas absorption for all points in the atmosphere.

This is useful in two different contexts:

1. For testing and plotting gas absorption. (For RT calculations, gas
absorption is calculated or extracted locally, therefore there is no
need to calculate a global field. But this method is handy for easy
plotting of absorption vs. pressure, for example.)

2. Inside the scattering region, monochromatic absorption is
pre-calculated for the entire atmospheric field.

Because of the different contexts, the method can calculate absorption
either for all frequencies in the frequency grid (f_index<0), or just
for the frequency indicated by f_index (f_index>=0).

The calculation itself is performed by the
abs_scalar_gas_agenda.

Authors: Stefan Buehler

Synopsis

abs_fieldCalc(

abs_field, abs_scalar_gas_agenda, f_index, f_grid, atmosphere_dim, p_grid, lat_grid, lon_grid, t_field, vmr_field, doppler )

Variables

OUT	abs_field	(Tensor5)	Scalar gas absorption field.
IN	abs_scalar_gas_agenda	(Agenda)	See agendas.cc.
IN	f_index	(Index)	Frequency index.
IN	f_grid	(Vector)	The frequency grid for monochromatic pencil beam calculations.
IN	atmosphere_dim	(Index)	The atmospheric dimensionality (1-3).
IN	p_grid	(Vector)	The pressure grid.
IN	lat_grid	(Vector)	The latitude grid.
IN	lon_grid	(Vector)	The longitude grid.
IN	t_field	(Tensor3)	The field of atmospheric temperatures.
IN	vmr_field	(Tensor4)	VMR field.
GIN	doppler	(Vector, Default: [])	A vector of doppler shift values in Hz. Must either be empty or have same dimension as p_grid