ES 11_9_09 Atmosphere Fossil Fuels

ES 11_9_09 Atmosphere Fossil Fuels - Earths Atmosphere 7 8...

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Earth’s Atmosphere 78% Nitrogen molecules (N 2 ) 21% Oxygen molecules (O 2 ) 1% Water vapor, argon, carbon dioxide, trace gases Properties used to define the atmosphere Temperature (average movement of molecules) – Molecules move faster as things get hotter – Only at -273 Celsius (0 Kelvin) is there no molecular motion Heat (total movement of molecules)
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4 layers based on temperature properties 2 layers heat from the bottom 2 layers heat internally
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Visible Light from the Sun Infrared from Earth Heat (Infrared) from the Earth Sun’s light energy goes through the atmosphere and is absorbed by the Earth Earth re-radiates that energy as heat The troposphere is heated from the bottom
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Convective Instability in Troposphere (weather) Wind patterns created because most of sun’s energy falls on the equator – has to circulate out Hot “fluid” below a cool “fluid” – Just like boiling water in a pot This convection of air gives us wind and weather
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Earth’s Convection Cells Hadley Cells Due to Earth’s rotation on its axis, there are actually 3 convection cells per hemisphere
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