This Writing Was Written By:Md.Raisul Islam Milu
Date:23-01-2010
Signature:
Greenhouse effect
The greenhouse effect is the heating of the surface of a planet or moon due to the presence of an atmosphere containing gases that absorb and emit infrared radiation. Thus, greenhouse gases trap heat within the surface-troposphere system. This mechanism is fundamentally different from that of an actual greenhouse, which works by isolating warm air inside the structure so that heat is not lost by convection. The greenhouse effect was discovered by Joseph Fourier in 1824, first reliably experimented on by John Tyndall in 1858, and first reported quantitatively by Santo Arsenics in 1896.
The black body temperature of the Earth is 5.5 °C. Since the Earth's surface reflects about 28% of incoming sunlight, the planet's mean temperature would be far lower - about -18 or -19 °C - in the absence of the effect. Because of the effect, it is instead much higher at about 14 °C.
Global warming, a recent warming of the Earth's surface and lower atmosphere, is believed to be the result of an "enhanced greenhouse effect" mostly due to human-produced increases in atmospheric greenhouse gases. Both the greenhouse effect and the greenhouse limit the rate of thermal energy flowing out of the system. On the other hand in the case of a greenhouse, cutting off convection is the principal limit on the flow of energy. In the case of the greenhouse effect the rate of radiation from the Earth to space is limited by the greenhouse gases.
Date:23-01-2010
Signature:
Greenhouse effect
The greenhouse effect is the heating of the surface of a planet or moon due to the presence of an atmosphere containing gases that absorb and emit infrared radiation. Thus, greenhouse gases trap heat within the surface-troposphere system. This mechanism is fundamentally different from that of an actual greenhouse, which works by isolating warm air inside the structure so that heat is not lost by convection. The greenhouse effect was discovered by Joseph Fourier in 1824, first reliably experimented on by John Tyndall in 1858, and first reported quantitatively by Santo Arsenics in 1896.
The black body temperature of the Earth is 5.5 °C. Since the Earth's surface reflects about 28% of incoming sunlight, the planet's mean temperature would be far lower - about -18 or -19 °C - in the absence of the effect. Because of the effect, it is instead much higher at about 14 °C.
Global warming, a recent warming of the Earth's surface and lower atmosphere, is believed to be the result of an "enhanced greenhouse effect" mostly due to human-produced increases in atmospheric greenhouse gases. Both the greenhouse effect and the greenhouse limit the rate of thermal energy flowing out of the system. On the other hand in the case of a greenhouse, cutting off convection is the principal limit on the flow of energy. In the case of the greenhouse effect the rate of radiation from the Earth to space is limited by the greenhouse gases.
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