AMSU Product 7 - 89 GHz

Brightness temperature at 89 GHz. Black to white: 198 K (or less) to 325 K. The clear ocean is dark because its low emissivity causes it to have a low brightness temperature. Water vapor and cloud liquid water brighten the image. Land has a high emissivity and thus appears bright. Scattering by ice particles in clouds (or snow) causes very low brightness temperatures (dark spots).

For More information on these AMSU products see CIRA's AMSU website