Longwave IR Window Channel (10.7 micron)

Thin Cirrus Emissivity (Page 4 of 10)

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A conceptual representation of the interaction between infrared radiation at 10.7 microns and thin cirrus cloud A GOES-8 10.7 micron longwave infrared channel image highlighting thinner cirrus surrounding a cumulonimbus cloud top

Thinner cirrus clouds are found upwind of the storm and to the southeast, along the anvil edge. These clouds have emissivities less than 1. A portion of the energy from below passes through the cloud represented by the large red arrow, while the cloud also absorbs and emits energy represented by the small red arrow. Thus, thin cirrus clouds appear warmer in the 10.7 micron channel than their actual cloud top temperature.


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