Green House Gases In Atmosphere


 
 
Concept Explanation
 

Green House Gases In Atmosphere

Greenhouse Gasses in Atmosphere: The greenhouse effect is the process by which absorption and emission of infrared radiation by atmospheric gases warm a planet's lower atmosphere and surface. Naturally occurring greenhouse gases have a mean warming effect of about 33°C (59°F), without which Earth would be uninhabitable. Rather, the issue is how the strength of the greenhouse effect changes when human activity increases the  atmospheric concentrations of some greenhouse gases.

On Earth, the major greenhouse gases are water vapour, which causes about 36-70% of the greenhouse effect (not including clouds); carbon dioxide (CO2), which causes 9-26%; methane (CH,), which causes 4-9%; and ozone, which causes 3-7% of the greenhouse efect. Molecule for molecule, methane is a more effective greenhouse gas than carbon dioxide, but its concentration is much smaller and its total radiative force is only about a fourth of that from carbon dioxide. Some other naturally occurring gases contribute very small fractions of the greenhouse effect; one of these, nitrous oxide (Na0), is increasing in concentration owing to human activity such as agriculture. The atmospheric concentrations of CO, and CH, have increased by 31% and 149% respectively since the beginning of the industrial revolution in the mid-1700s. The IPCC Special Report on Emissions Scenarios gives a wide range of future CO, scenarios, ranging from 541 to 970 ppm by the year 2100

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