Green effect -Green house gasses

Green effect -Green house gasses



The human interference in the atmosphere is done by a number of gases such as carbon dioxide (CO2), chlorofluorocarbons (CFxCLx), nitrous oxide (N2O), methane (CH4) and tropospheric ozone (O3). Among all these gases carbon dioxide (CO2) is of prime significance as the part played by the gas in the intensity of green house effect on our planet is almost 55 per cent. The contribution of other gases is also significant for example the chlorofluorocarbons contribute to about 25 per cent, methane to 15 per cent and nitrous oxide about 5 per cent. The extant to which ozone affects the green house effect is yet to be estimated

The strongest green house gas per molecule is artificially created chlorofluorocarbons. Their overall impact in the green house effect is less due to their low concentration in the atmosphere. Latest statistics have revealed that the concentration of such molecules will start to decline in coming future as to less emission. It is earlier reported that holes in ozone were created over the North and South Poles. In last two decades, this information played vital part in increasing awareness and many nations cutback the use of these chemicals and a general decline in global stratospheric ozone levels. The Montreal Protocol agreement was signed in 1987 by 46 nations in which an immediate timetable was proposed to reduce the production of chlorofluorocarbons and their usage.

The surface of earth turns into a radiator of energy in the infrared radiation due to its heating by the virtue of sun light. The radiation is directed to go back into the space where it is interesting to reveal that very small portion of it manages to go back. A large number of emitted back infrared radiations is absorbed by the green house gases.

The long wave energy absorbed by the atoms of the green house gases adds into the atmosphere additional energy. The radiation absorbed by the atoms is re-emitted into all directions. About 90 per cent of this energy is emitted towards the earth’s surface where it is once again absorbed. The heating of the surface once again results in the radiation which is again absorbed by the atoms of green house gases that are spread in the blanket of atmosphere and the cycle goes on until or unless no long wave radiation is available