Created: July 25, 2014

Proposer: Olivier Lauret & John Niedfeldt

Proposed Date: 2014-05-30

Change Date: July 25, 2014, 9:16 a.m.

Term: **normalized_radar_backscatter_coefficient**

Unit: 1

Unit ref: http://vocab.ndg.nerc.ac.uk/term/P061/current/UUUU

AMIP:

GRIB:

normalized_radar_backscatter_coefficient is also called the normalized radar cross section, which are commonly used in the microwave remote sensing community.

Change Date: July 25, 2014, 12:19 p.m.

Term: **surface_normalized_radar_backscatter_coefficient**

Unit: 1

Unit ref: http://vocab.ndg.nerc.ac.uk/term/P061/current/UUUU

AMIP:

GRIB:

The quantity called surface_normalized_radar_backscatter_coefficient is also commonly called the "normalized radar cross section" or "sigma naught" in the microwave remote sensing community. It is the fraction of incident power that is reflected by the surface. The surface_normalized_radar_backscatter_coefficient is measured at a single wavelength and at a single angle of incidence, which should be specified using scalar coordinate variables with standard names, respectively, of radiation_wavelength and angle_of_incidence. Scattering of radiation is its deflection from its incident path. Backwards scattering refers to the sum of scattering into all backward angles i.e. scattering_angle exceeding pi/2 radians. A scattering_angle should not be specified with this quantity. The surface_normalized_radar_backscatter_coefficient differs from the quantity surface_backwards_scattering_coefficient_of_radar_wave in that the latter does not require a radiation_wavelength and angle_of_
incidence to be specified.

Change Date: July 25, 2014, 12:20 p.m.

Term: **surface_normalized_radar_backscatter_coefficient**

Unit: 1

Unit ref: http://vocab.ndg.nerc.ac.uk/term/P061/current/UUUU

AMIP:

GRIB:

The quantity called surface_normalized_radar_backscatter_coefficient is also commonly called the "normalized radar cross section" or "sigma naught" in the microwave remote sensing community. It is the fraction of incident power that is reflected by the surface. The surface called "surface" means the lower boundary of the atmosphere. The surface_normalized_radar_backscatter_coefficient is measured at a single wavelength and at a single angle of incidence, which should be specified using scalar coordinate variables with standard names, respectively, of radiation_wavelength and angle_of_incidence. Scattering of radiation is its deflection from its incident path. Backwards scattering refers to the sum of scattering into all backward angles i.e. scattering_angle exceeding pi/2 radians. A scattering_angle should not be specified with this quantity. The surface_normalized_radar_backscatter_coefficient differs from the quantity surface_backwards_scattering_coefficient_of_radar_wave in that the latter does not require a radiation_wavelength and angle_of_
incidence to be specified.