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Definition of Longwave radiation

Longwave radiation Definition from Science & Technology Dictionaries & Glossaries
WEATHER&METEOROLOGY
The electromagnetic radiation emitted by the Earth is in the infrared band of the electromagnetic spectrum and is referred to as outgoing longwave radiation.
Longwave radiation Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Outgoing Longwave Radiation (OLR) is the energy leaving the Earth as infrared radiation at low energy to Space. OLR is a critical component of the Earth’s radiation budget and represents the total radiation going to space emitted by the atmosphere.    Earth's radiation balance is very closely achieved since the OLR very nearly equals the Shortwave Absorbed Radiation received at high energy from the sun. Thus, the first law of thermodynamics (energy conservation) is satisfied and the Earth's average temperature is very nearly stable. The OLR is affected by clouds and dust in the atmosphere, which tend to reduce it below clear sky values.  Greenhouse gases, such as methane (CH4), nitrous oxide (N2O), water vapor (H2O) and carbon dioxide (CO2), absorb certain wavelengths of OLR adding heat to the atmosphere, which in turn causes the respective absorbing layer of the atmosphere to emit more radiation. Some of this radiation is directed back towards the Earth, increasing the average temperature of the Earth's surface. Therefore, an increase in the concentration of a greenhouse gas would contribute to global warming by increasing the amount of radiation that is absorbed and emitted by these atmospheric constituents.

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Longwave radiation Definition from Society & Culture Dictionaries & Glossaries
EPA Glossary of Climate Change Terms
The radiation emitted in the spectral wavelength greater than 4 micrometers corresponding to the radiation emitted from the Earth and atmosphere. It is sometimes referred to as terrestrial radiation or infrared radiation, although somewhat imprecisely. See infrared radiation.
Provided as a public service by the U.S. Environmental Protection Agency. Reference list click here.