Chapt08_AtmosphericCirculation&Weather

Chapt08_AtmosphericCirculation&Weather - Atmospheric...

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Unformatted text preview: Atmospheric Circulation & Weather Chap 8 Composition of the Atmosphere • Nitrogen – 78.084 % • Oxygen – 20.946 % • Argon – 0.934 % • Carbon Dioxide – 0.033 % • Other gases – 0.003 % GLOBAL HEATING DRIVES ATMOSPHERIC CIRCULATION 1. THE EARTH IS HEATED UNEVENLY Lower latitudes are heated more intensely than higher latitudes, so there is a surplus of heat at low latitudes 2. THE ATMOSPHERE IS HEATED FROM BELOW The atmosphere is warmed by heat radiating from the earth's surface. The atmosphere is transparent to most solar radiation, so little of the sun's energy heats it directly. 3. THE RESULT: THE ATMOSPHERE CIRCULATES IN CONVECTION CELLS. Convection transfers heat from low latitudes (where there is a surplus) to higher latitudes BUT this process is complicated by the fact that the earth rotates. 09/24/11 Prepared by:Prof. Rodriguez 6 Global Circulation • Heat Expand, Cooling Contracts Atmosphere ( 8.1) • 1. Sun Radiation Greater In The Equator Air Heat And Rise • 2. Poles - Air Is Contracting And Descending • 3. Convectional Circulation - Low Pressure Equator, High Poles 09/24/11 Prepared by:Prof. Rodriguez 7 Coriolis Effect • Deflection Of Object Due To The Earth Rotation (8.11) • 1. Right In The N. Hemisphere (clockwise) • 2. Left In The S. Hemisphere (counterclockwise) • 3. No Deflection In The Equator Review the Concepts • List the most common gases of the atmosphere in order of abundance. • Describe what causes uneven heating of the earth. • What is the Coriolis effect? 09/24/11 Prepared by:Prof. Rodriguez 9 Atmospheric Circulation • 1. Six circulation cells ( 8.12) • 2. Equatorial - Doldrums, Low, Cools, Condense, Precipitation • 3. Westerlies - N & S - from West • 4. Trade Winds - N & S • 5. Easterlies - Polar Areas - N & S - from East •...
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This note was uploaded on 09/24/2011 for the course OCE 1001 taught by Professor Staff during the Spring '11 term at Broward College.

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Chapt08_AtmosphericCirculation&Weather - Atmospheric...

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