When electromagnetic radiation travels through the atmosphere, it may be absorbed or scattered by the constituent particles of the atmosphere. Molecular absorption converts the radiation energy into excitation energy of the molecules. Scattering redistributes the energy of the incident beam to all directions.
How does the atmosphere affect electromagnetic radiation?
Particles and gases in the atmosphere can affect the incoming light and radiation. … Scattering occurs when particles or large gas molecules present in the atmosphere interact with and cause the electromagnetic radiation to be redirected from its original path.
Does the atmosphere emit electromagnetic radiation?
Emitted LONGWAVE Radiation
Radiation from the warmed upper atmosphere, along with a small amount from the Earth’s surface, radiates out to space. Most of the emitted longwave radiation warms the lower atmosphere, which in turn warms our planet’s surface.
How does radiation affect atmospheric conditions?
Very little of the radiation emitted by Earth’s surface passes directly through the atmosphere. Most of it is absorbed by clouds, carbon dioxide, and water vapour and is then reemitted in all directions. The atmosphere thus acts as a radiative blanket over Earth’s surface, hindering the loss of heat to space.
What is EMR in atmosphere?
INTERACTION OF EMR WITH ATMOSPHERE AND EARTH SURFACE 5 INTERACTIONS WITH EARTH SURFACE FEATURES Electromagnetic radiation that passes through the earth’s atmosphere without being absorbed or scattered reaches the earth’s surface to interact in different ways with different materials constituting the surface.
How does the atmosphere absorb radiation?
The Earth radiates energy at wavelengths much longer than the Sun because it is colder. Part of this longwave radiation is absorbed by greenhouse gases which then radiate energy into all directions, including downwards and thereby trapping heat in the atmosphere.
What is meant by atmospheric effect and the reactions that occur in the atmosphere?
Atmospheric effects have several impacts on the solar radiation at the Earth’s surface. a change in the spectral content of the solar radiation due to greater absorption or scattering of some wavelengths; … the introduction of a diffuse or indirect component into the solar radiation; and.
What causes radiation in the atmosphere?
Introduction. Atmospheric radiation originates with the Sun. Absorption of solar radiation by the Earth’s surface, and by water vapor and ozone in the lower atmosphere, warms the atmosphere, causing the emission of thermal infrared radiation at wavelengths corresponding to the spectral lines of infrared-active species.
Why does the atmosphere emit infrared radiation and not UV or visible?
Once in the Earth’s atmosphere, clouds and the surface absorb the solar energy. The ground heats up and re-emits energy as longwave radiation in the form of infrared rays. … Our atmosphere is transparent to radio waves, visible light, and some infrared and UV radiation.
What type of radiation passes through the atmosphere?
Some wavelengths of infrared radiation pass through the Earth’s atmosphere, while others are blocked – this gives rise to ‘infrared windows’ which can be measured from the ground.
What is the atmospheric effect?
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What does the atmosphere effect?
The atmosphere protects life on earth by shielding it from incoming ultraviolet (UV) radiation, keeping the planet warm through insulation, and preventing extremes between day and night temperatures. The sun heats layers of the atmosphere causing it to convect driving air movement and weather patterns around the world.
What factors in the atmosphere seem to have the greatest effect on radiation?
Absorption by the atmosphere (mainly by air molecules and water vapour) and reflection by clouds are the two main reasons for solar radiation not reaching the ground.
What happens to the electromagnetic radiation EMR that reaches the earth’s surface?
Electromagnetic radiation that passes through the earth’s atmosphere without being absorbed or scattered reaches the earth’s surface to interact in different ways with different materials constituting the surface.
What is electromagnetic radiation in GIS?
GIS Dictionary. electromagnetic radiation. [physics] Energy that moves through space at the speed of light as different wavelengths of time-varying electric and magnetic fields. Types of electromagnetic radiation include gamma, x, ultraviolet, visible, infrared, microwave, and radio.
What are the principles of electromagnetic radiation?
Electromagnetic radiation is an electric and magnetic disturbance traveling through space at the speed of light (2.998 × 108 m/s). It contains neither mass nor charge but travels in packets of radiant energy called photons, or quanta.