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III. Suy thoái ozon tầng bình lưu

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• The influx of oxygen from the seas created an ecological

crisis, as it poisoned many of the other species of bacteria.

41



The Atmosphere

• The atmosphere is a thin



layer of gases that

surrounds the earth.

• The bottom layer, the



troposphere, contains

the air we breathe and

every aspect of what we

call weather.



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• The infrared energy is then re-radiated off the

Earth’s surface, back towards space. Some of that

energy is kept at the surface by the troposphere. 43



Solar Energy

 The sun: 99% H2, d (the earth – the sun) = 150 millions km, T = 5500

C.



o



 The solar radiation drives almost all life systems on earth and the

earth’s climate and weather.



Incident irradiation = reflected irradiation



Greenhouse Effect

The trapping of some of the infrared radiation within the

atmosphere keeps the Earth’s daily temperature

fluctuations within a small, habitable range.

 This is called the greenhouse effect.



The greenhouse gases responsible for this effect include:

 Chloroflurocarbons (CFCs) (nồng độ thấp nhất)

 Nitrous oxide

 Methane

 Carbon dioxide (nồng độ cao nhất)

45



Spectra of greenhouse gas absorption superimposed over emission

spectra of earth and sun [data from NIST Chemistry Webbook (2005)]



Greenhouse Gases



Illustrating the concept of atmospheric

lifetime of atmospheric gases



CO2 rough: Enting and Newman provided 1990.



Anthropogenic Effect on Climate (1)



IPCC: Intergovermental Panel of Climate Change



Anthropogenic Effect on Climate (2)



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III. Suy thoái ozon tầng bình lưu

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