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The greenhouse effect on Earth is defined as: "The infrared radiative effect of all infrared absorbing constituents in the atmosphere.Greenhouse gases (GHGs), clouds, and some aerosols absorb terrestrial radiation emitted by the Earth's surface and elsewhere in the atmosphere."
Earth constantly absorbs energy from sunlight and emits thermal radiation as infrared light. In the long run, Earth radiates the same amount of energy per second as it absorbs, because the amount of thermal radiation emitted depends upon temperature: If Earth absorbs more energy per second than it radiates, Earth heats up and the thermal radiation will increase, until balance is restored; if ...
Greenhouse gases interfere with energy leaving. They exchange thermal radiation with the surface, cancelling flows of radiative energy that would otherwise head towards space. And, while greenhouse gases emit thermal radiation that reaches space, they do so at a high altitude, where temperatures and thermal radiation emission rates are low.
Of the surface heat captured by the atmosphere, more than 75% can be attributed to the action of greenhouse gases that absorb thermal radiation emitted by the Earth's surface. The atmosphere in turn transfers the energy it receives both into space (38%) and back to the Earth's surface (62%), where the amount transferred in each direction ...
Solar radiation is converted to heat energy, causing the emission of longwave (infrared) radiation back to the atmosphere (396 watts per square meter). Some of the infrared radiation is absorbed and re-emitted by heat-trapping "greenhouse" gases in the atmosphere. Outgoing infrared radiation from the Earth equals 239 watts per square meter ...
Thermal radiation is the emission of electromagnetic waves from all matter that has a temperature greater than absolute zero. [5] [2] Thermal radiation reflects the conversion of thermal energy into electromagnetic energy. Thermal energy is the kinetic energy of random movements of atoms and molecules in matter. It is present in all matter of ...
Of the surface heat captured by the atmosphere, more than 75% can be attributed to the action of greenhouse gases that absorb thermal radiation emitted by the Earth's surface. The atmosphere in turn transfers the energy it receives both into space (38%) and back to the Earth's surface (62%), where the amount transferred in each direction ...
English: Comparison of Earth's upward flow of infrared thermal radiation in reality and in a hypothetical scenario in which greenhouse gases and clouds are removed or lose their ability to absorb thermal radiation—without changing Earth's albedo (i.e., reflection/absorption of sunlight). Top shows the balance between Earth's heating and ...