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Published: Monday 23 September, 2013

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When sunlight reaches the surface of the Earth, some of it is absorbed and warms the surface. Because the Earth surface is much cooler than the sun, it radiates energy at much longer wavelengths than the sun does, peaking in the inf purses and handbags rared at about 10m. The atmosphere absorbs these longer wavelengths more effectively than it does the shorter wavelengths from the sun. The absorption of this longwave radiant energy warms the atmosphere; the atmosphere also is warmed by transfer of sensible and latent heat from the surface. Greenhouse gases also emit longwave radiation both upward to space and downward to the surface. The downward part of this longwave radiation emitted by the atmosphere is the greenhouse effect. The term is a misnomer, as this process is not the mechanism that warms g purses and handbags reenhouses.



The major greenhouse gases are water vapor, which causes about 3670% of the greenhouse effect on Earth not including clouds; carbon dioxide, which causes 926%; methane, which causes 49%, and ozone, which causes 37%. It is not possible to state that a certain gas causes a certain percentage of the greenhouse effect, because the influences of the various gases are not additive. The higher ends of the ranges quoted are for the gas alone; the lower ends, for the gas counting overlaps.34 Other greenhouse gases include, but are not limited to, nitrous oxide, sulfur hexafluoride, hydrofluorocarbons, perfluorocarbons and chlorofluorocarbons see IPCC list of greenhouse gases.



The major atmospheric constituents nitrogen, N2 and oxygen, O2 are not greenhouse gases. This is because homonuclear diatomic molecules such as N2 and O2 neither absorb nor emit infrared radiation, as there is no net change in the dipole moment of these molecules when they vibrate. Molecular vibrations occur at energies that are of the same magnitude as the energy of the photons on infrared light. Heteronuclear diatomics such as CO or HCl absorb IR; however, these molecules are shortlived in the atmosphere owing to their reactivity and solubility. As a consequence they do not contribute significantly to the greenhouse effect.



Late 19th century scientists experimentally discovered that N2 and O2 did not absorb infrared radiation called, at that time, dark radiation and that CO2 and many other gases did absorb such radiation. It was recognized in the early 20th century that the known major greenhouse gases in the atmosphere caused the earth temperature to be higher than it would have been witho purses and handbags ut the greenhouse gases.



Greenhouse gases are components of the atmosphere that contribute to the greenhouse effect. Without the greenhouse effect the Earth would be uninhabitable in its absence, the mean temperature of the earth would be about 19 C 2 F, 254 K rather than the present mean temperature of about 15 C 59 F, 288 K. Greenhouse gases include in the order of relative abundance water vapour, carbon dioxide, methane, nitrous oxide, and ozone. Greenhouse gases come from natural sources and human activity.



These gases allow sunlight to enter the atmosphere freely. When sunlight strikes the Earths surface, some of it is reflected back towards space as infrared radiation heat. Greenhouse gases absorb this infrared radiation and trap the heat in the atmosphere.



Many gases exhibit these greenhouse properties. Some of them occur in nature water vapor, carbon dioxide, methane, and nitrous oxide, while others are exclusively humanmade like gases used for aerosols. purses and handbags

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