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EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION > OUTGOING LONGWAVE RADIATION
Definition:
The outgoing longwave radiation (OLR) refers specifically to the
radiation emitted by the Earth and its atmosphere (the terrestrial
radiation). Satellite measurements of the OLR from terrestrial surfaces
and clouds show that OLR is low over cold land and high clouds and high
over hot land surfaces. Climate variations, such as El Nino Southern
Oscillation (ENSO) can be measured from OLR anomalies from longer-term
variations. 
Reference:
WMO. 1966. International Meteorological Vocabulary. WMO/OMM/BMO, No. 182. TP.
91., Switzerland. Carleton, A.M. Satellite Remote Sensing in Climatology,
Belhaven Press, London, UK.
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