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GREEN HOUSE

EFFECT


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Most greenhouseslook like aclear mini glass house. Theyare used to grow plants inany environment.Greenhouses work becausewhen the sun comes out thegreen house can trap thesunlight and use it to growplants. The glass panels trap

as much sunlight as possiblebut keeps heat in. Thiscauses the greenhouse toheat up and help the plantsgrow.


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Like a greenhousethe earths

atmosphere trapsheat and energyfrom the sun.


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Earths atmosphere is slightly warmer

than what it should be due to directsolar heating because of a mi ld case of

greenhouse effect

The ground is heated by visible

and (some) infrared light from the

Sun. The heated surface emits infrared

light.

The majority of Earths

atmosphere (N2and O2) are not

good greenhouse gas. The small amount of greenhouse

gases (H2O, CO2) traps (absorb

and re-emit) the infrared radiation,

increasing the temperature of the

atmosphere
http://localhost/var/www/apps/conversion/tmp/scratch_1/applets/the_greenhouse_effect.htm


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incoming

radiation

Solar energy reaches the Earths surface


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incoming

radiation

infrared radiation

Earths surface warms, emits radiation


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incoming

radiation

infrared radiation

greenhousegases

Greenhouse gases absorb IR leaving the surface


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incoming

radiation

infrared radiation

greenhousegases

Gases are energized, then emit radiation (IR)


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incoming

radiation

infrared radiation

greenhousegases

Some of this IR reaches the planet surface, warming it further


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b


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An increase in atmospheric temperature(human or natural origin) will lead to theincrease in the water vapor content ofthe troposphere.

Because water vapor is a strong

greenhouse gas, the increase in H2Ovapor in turn causes enhancedgreenhouse effect, raising thetemperature more.

Higher atmospheric temperature willcause more evaporation of water

Which leads to even highertemperature

Runaway Green House Effect!


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The primary components of Earths atmosphere, N2

and O2do not have absorption in the IR wavelengthrange, therefore, do not have a significant role insetting the surface temperature of the planet

Greenhouse gas are efficient in absorbing IR light

The most important greenhouse gases are:

H2O Water vapor.CO2Carbon DioxideCH4methane The most abundant greenhouse gas in Earths

atmosphere is water vapor. Most of thegreenhouse heating of Earths atmosphere isdue to Water vapor absorption of IR radiationemitted by Earth, and then transferring theenergy to the surrounding air molecule


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The following pie chart displays the percent of eachgas

which plays a role in the greenhouseeffect.


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Burning natural gasses

Deforestation

Population growth


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Without the greenhouse effect, the Earthwould not be able to support life. But if thegreenhouse effect becomes too strong, theearth will be too hot to support life. Even alittle to much heat could hurt the animals,plants, and everything else on the planet.Without the gasses that surround the planet,heat would escape back into space,

causing the earths average tempter to beabout 60 degrees colder.


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If we were to move the Earth closer to the Sun, like where

Venus is now, then we would suffer the runaway greenhouse

effect as well, lose all the water, and become hot like Venus.

Oth l t l h G h Eff t


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MarsAtmosphere: mass 80% CO2

Sfc. Temp.: -47C

GH Effect: 10C

FAR TOO COLD!

Other planets also have Greenhouse Effects,

but these are unsuitable for life

EarthGH Gases: ~0.04% CO2

~ 1% H2O

Sfc. Temp.: 15C

GH Effect: 33C

NOT BAD!

Venus Atmosphere: mass 90x

earths

GH Gases: >90% CO2Sfc. Temp.: 477C

GH Effect: 523C

FAR TOO HOT!

Sun


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Greenhouse gases absorb infraredradiation and prevent it from escapingto space.

Carbon dioxide, methane, and nitrousoxide are very good

At capturing energy at wavelengths thatother compounds


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BY:

PRANAY RAJPUT%X B

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