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Workspace Method AtmFieldPerturbAtmGrids

Description

As AtmFieldPerturb, but perturbation follows the atmospheric grids.

The method effectively performs this
  perturbed_field = original_field
  perturbed_field(p_index,lat_index,lon_index) += pert_size
if not *pert_mode* is set to relative when this is done
  perturbed_field = original_field
  perturbed_field(p_index,lat_index,lon_index) *= 1*pert_size
where p_index etc. are derived from *pert_index*.

Authors: Patrick Eriksson

Synopsis

AtmFieldPerturbAtmGrids(

perturbed_field, atmosphere_dim, p_grid, lat_grid, lon_grid, original_field, pert_index, pert_size, pert_mode )

Variables

GOUT	perturbed_field	(Tensor3)	Perturbed/modified field.
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.
GIN	original_field	(Tensor3)	Original field, e.g. t_field.
GIN	pert_index	(Index)	Index of position where the perturbation shall be performed.
GIN	pert_size	(Numeric)	Size of perturbation.
GIN	pert_mode	(String, Default: "absolute")	Type of perturbation, ansolute or relative.