Looking for the definet definition for "GREEN HOUSE EFFECT". how it effects the envirnment,?

Question

how it plays major roles in the climatic changes.is it is going to effects for the total dissoster of the mankind in the earth.

Answer 1

The greenhouse effect is the process in which the emission of infrared radiation by the atmosphere warms a planet's surface. The name comes from the incorrect analogy with the warming of air inside a greenhouse compared to the air outside the greenhouse . The greenhouse effect was discovered by Joseph Fourier in 1824 and first investigated quantitatively by Svante Arrhenius in 1896. The term 'greenhouse effect' originally came from the greenhouses used for gardening, but it is a misnomer because greenhouses operate differently.[19][20][21] A greenhouse is built of glass. It heats up mainly because the sun warms the ground inside it and this warms the air in the greenhouse. The air continues to heat because it is confined within the greenhouse, unlike the environment outside the greenhouse where warm air near the surface rises and mixes with cooler air aloft. This can be demonstrated by opening a small window near the roof of a greenhouse: the temperature will drop considerably. It has also been demonstrated experimentally (Wood, 1909): a "greenhouse" built of rock salt (which is transparent to infrared radiation) heats up just as one built of glass does. Greenhouses thus work primarily by preventing convection the atmospheric greenhouse effect however reduces radiation loss, not convection. It is quite common, however, to find sources that make the erroneous "greenhouse" analogy. Although the primary mechanism for warming greenhouses is the prevention of mixing with the free atmosphere, the radiative properties of the glazing can still be important to commercial growers. With the modern development of new plastic surfaces and glazings for greenhouses, this has permitted construction of greenhouses which selectively control radiation transmittance in order to better control the growing environment.Quantum mechanics provides the basis for computing the interactions between molecules and radiation. Most of this interaction occurs when the frequency of the radiation closely matches that of the spectral lines of the molecule, determined by the quantization of the modes of vibration and rotation of the molecule. (The electronic excitations are generally not relevant for infrared radiation, as they require energy larger than that in an infrared photon.)



Major greenhouse gas trendsThe width of a spectral line is an important element in understanding its importance for the absorption of radiation. In the Earth’s atmosphere these spectral widths are primarily determined by “pressure broadening”, which is the distortion of the spectrum due to the collision with another molecule. Most of the infrared absorption in the atmosphere can be thought of as occurring while two molecules are colliding. The absorption due to a photon interacting with a lone molecule is relatively small. This three-body aspect of the problem, one photon and two molecules, makes direct quantum mechanical computation for molecules of interest more challenging. Careful laboratory spectroscopic measurements, rather than ab initio quantum mechanical computations, provide the basis for most of the radiative transfer calculations used in studies of the atmosphere.

Answer 2

Definition: greenhouse effect: Increase in temperature caused when incoming solar radiation is passed but outgoing thermal radiation is blocked by the atmosphere (carbon dioxide and water vapor are the major factors).

Answer 3

The science behind the greenhouse effect is quite simple:

Solar heat reaches Earth in the form of visible and UV light. Some of this light is reflected back into space by clouds and light-scattering particles before it reaches Earth’s surface. Most of the light does reach Earth's surface, providing warmth for sunbathers and energy for photosynthesis in plants.

Once this energy warms the planet, it is then reflected off of Earth and back towards space in the form of longwave energy, or infrared light. Some of this infrared energy escapes into outer space, and some will be absorbed by molecules in the atmosphere. Most molecules in the atmosphere, such as nitrogen and oxygen, can not absorb this infrared energy. Greenhouse gases (CO2, H2O, and CH4) are "tuned" to absorb energy at infrared wavelengths. Absorbing energy "excites" these greenhouse molecules.

Because energy can neither be created nor destroyed, "excited" greenhouse gas molecules will gradually radiate its captured infrared energy as heat. Heat is radiated from "excited" greenhouse molecules into all directions; some of the energy is lost to space, some is directed downwards and warms earth's surface even more.

It is very rare that you will find someone that completely disagrees with modern physics properties such as the fact that CO2 and other gases act as greenhouse gases (capturing escaping infrared energy to then release as heat.) Earth has a natural greenhouse gas effect. It is true that if the atmosphere completely lacked greenhouse gases, then the global temperate would then be about 30°C (55° Fahrenheit) cooler. Water would be locked away as ice, and life would probably not be possible.

Answer 4

see the link

it contains everything abt green house effect

Answer 5

The greenhouse effect is the process in which the emission of infrared radiation by the atmosphere warms a planet's surface. The name comes from the incorrect analogy with the warming of air inside a greenhouse compared to the air outside the greenhouse (see "Real Greenhouses" below). The greenhouse effect was discovered by Joseph Fourier in 1824 and first investigated quantitatively by Svante Arrhenius in 1896