The Airmass RGB

Information received from the three channels that contribute to the RGB combination

WV6.2 - WV 7.3 (difference of the two WV channels) Information about moisture content in middle/upper layers of the troposphere
IR 9.7 - IR 10.8 (ozone channel - IR window channel) Information about ozone concentration, which differentiates cold (polar) and warm (mid-level, subtropical) air masses
Cold air mass: high ozone concentration and low tropopause; warm air mass: low ozone concentration and high tropopause
WV 6.2 (Water Vapor channel 05) Information about humidity in upper layers of the troposphere

Resulting colors for typical features

White Thick clouds
Green Warm air masses
Blue Cold air masses
Dark red/brown Dry upper air, PV anomalies

Typical application areas

  • Differentiation between cold and warm air masses (blue - green)
  • Recognition of very dry air that has descended from the stratosphere (dark brown)
  • Dynamical features: tropopause folding; high PV values

Due to the incorporation of water vapor and ozone channels, the Airmass RGB's usage at high satellite viewing angels is limited.