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Workspace Method SurfaceFastem


FASTEM sea surface microwave emissivity parametrization.

This method allows to use FASTEM in retrievals requiring the
Jacobian. Otherwise as surfaceFastem. See *SurfaceBlackbody
for general remarks about methods of SurfaceSomething type.

This is an example on a surface method starting with a capital S,
e.g. SurfaceSomething. These methods differ from the methods
named as surfaceSomething in two ways:
  1. The surface properties to apply are taken directly from
  2. The Jacobian with respect to the surface properties can be
The Jacobian can be obtained for all variables in surface_props_data
that the method of concern is using.

For this method, surface_props_data must contain these data:
  "Water skin temperature"
  "Wind speed"
  "Wind direction"

Authors: Patrick Eriksson


SurfaceFastem( surface_los, surface_rmatrix, dsurface_rmatrix_dx, surface_emission, dsurface_emission_dx, stokes_dim, atmosphere_dim, lat_grid, lon_grid, f_grid, rtp_pos, rtp_los, surface_props_data, surface_props_names, dsurface_names, jacobian_do, transmittance, fastem_version )


OUTsurface_los(Matrix)Downwelling radiation directions to consider in surface reflection.
OUTsurface_rmatrix(Tensor4)The reflection coefficients for the directions given by surface_los to the direction of interest.
OUT+INdsurface_rmatrix_dx(ArrayOfTensor4)The derivative of surface_rmatrix with respect to quantities listed in dsurface_names.
OUTsurface_emission(Matrix)The emission from the surface.
OUT+INdsurface_emission_dx(ArrayOfMatrix)The derivative of surface_emission with respect to quantities listed in dsurface_names.
INstokes_dim(Index)The dimensionality of the Stokes vector (1-4).
INatmosphere_dim(Index)The atmospheric dimensionality (1-3).
INlat_grid(Vector)The latitude grid.
INlon_grid(Vector)The longitude grid.
INf_grid(Vector)The frequency grid for monochromatic pencil beam calculations.
INrtp_pos(Vector)Position of a radiative transfer point.
INrtp_los(Vector)Line-of-sight at a radiative transfer point.
INsurface_props_data(Tensor3)Various surface properties.
INsurface_props_names(ArrayOfString)Name on surface properties found in surface_props_data.
INdsurface_names(ArrayOfString)Name of surface retrieval quantities.
INjacobian_do(Index)Flag to activate (clear-sky) Jacobian calculations.
GINtransmittance(Vector)Transmittance along path of downwelling radiation. A vector with the same length as f_grid.
GINfastem_version(Index, Default: 6)The version of FASTEM to use.