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Atmospheric dynamics

Air Pressure

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Air Pressure The weight of the air above Earth?s surface Thanks to gravity, the atmosphere has weight. What affects air pressure? Altitude ? air pressure decreases the higher you go up 2 miles up Sea level Decreasing Air Pressure Higher Concentration of air molecules Gravity forces most air molecules to remain close to Earth?s surface Cold air is more dense than warm air Cold air has higher air pressure because the molecules are closer together v v COLD HOT Warm air has LESS air pressure because molecules are farther apart COLD HOT Which air mass can hold more water vapor? v v COLD HOT v v c COLD HOT Air Molecule Water Molecule Warmer air can hold more water molecules than cooler air

ENSO

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ENSO El Nino and La Nina ENSO stands for El Nino Southern Oscillation. The average cycle is 7 years. ENSO occurs in tropical waters (Southern Equatorial Pacific) El Nino means ?The Child? because it usually happens around Christmas so its connected to the baby Jesus Solar Intensity and Latitude At low latitudes (near the equator) the sun?s rays are nearly vertical At high latitudes (near the poles) the sun?s rays are much less intense because the sun remains close to the horizon Tropical latitudes are the warmest Air rises there This causes convection cells (Hadley Cells) that constantly move air throughout the atmosphere Normal conditions in Southern Pacific These surface winds move warmer surface water to the west

Climatology

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1 CLIMATOLOGY The Atmosphere The atmosphere is made up of gases and vapour, and receives incoming solar energy from the sun giving rise to what we call climate. We actually live at the bottom of this indefinite layer of atmosphere where the air is densest. Hither up, the air thins out and it is still a matter of conjecture where the atmosphere ends. One estimate puts this limit at about 600 miles above sea level. The lowest layer, in which the weather is confined, is known as the troposphere. It extends from the earth?s surface for a height of 6 miles, and within it temperature normally falls with increasing altitude. The climatic elements such as temperature, precipitation, clouds, pressure and humidity within the troposphere
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