Because bands 1 and 2 are relatively close on the electromagnetic spectrum, we can reasonably assume their aerosol radiances are the same.
Over the land the retrieval of temperature from radiances is harder, because of the inhomogeneities in the surface.
The resulting temperature profiles depend on details of the methods that are used to obtain temperatures from radiances.
They measure radiances in various wavelength bands, from which temperature may be inferred.
They measure radiances in various wavelength bands, which must then be mathematically inverted to obtain indirect inferences of temperature.
As the satellites' orbits gradually decayed towards the earth the area from which they received radiances was reduced, introducing a false cooling trend.
However, he treated it as an infinite collection of vectors, one per direction impinging on the point, with lengths proportional to their radiances.
Weather satellites do not measure temperature directly but measure radiances in various wavelength bands.
