el%20nino_chapter%204 - Next time Ocean Atmosphere ENSO and...

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Next time: Ocean – Atmosphere ENSO and NAO Humidity
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Semipermanent pressure sytems. Vary in size, intensity, and locational shifting with the seasons and sun’s migration. The equatorial low moves north in July, following the sun’s seasonal migration. The subtropical highs of the Southern Hemisphere are equatorward of their January (summer) locaitons.
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Monsoon Winds Monsoon- directional reversal of winds from one season to the next Seasonal shift of the winds Low pressure (summer) – wet High pressure (winter) – dry
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Trade Winds (5 o -25 o ) – blow out of the subtropical highs toward equatorial low in N + S hemispheres. Northeast trades Southeast trades Tropical easterlies
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Trade Winds (5 o -25 o ) – blow out of the subtropical highs toward equatorial low in N + S hemispheres. Northeast trades Southeast trades Tropical easterlies Subtropical Highs – 25-35 N+S Air sinks – calm winds, sunny, dry, rainless especially along west coasts Westerlies – 35 -65 N+S Winds flow poleward out of subtropical highs are deflected to the right and blow from the SW in the northern hemisphere. Associated with stormy weather Polar Winds – cold air out of polar regions meets warmer air from westerlies. Polar Front Relatively warm air (westerlies) meets cold air (polar) Subpolar low zone
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Local Winds – respond to local terrain or land-water differences in heating and cooling similar to large wind systems. Chinook (Foehn) The term Chinook means “snow eater.” Form when air must pass over a mountain range As they flow down the leeward side, air is compressed and heated at a high rate than it cooled when it ascended up the mountain on the windward side. Warm dry winds can damage crops, be a fire hazard and trigger avalanches. Santa Ana Katabatic (drainage) winds
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Local Winds – respond to local terrain or land-water differences in heating and cooling similar to large wind systems. Santa Ana Forms when high pressure develops over desert regions Air is warmer and can fan forest and brush fires
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Land-Sea Breeze Diurnal (daily reversal of wind) Differential heating between land and water
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Visualizing Physical Geography Coastal Situation Land and Sea Breeze  – Are simple examples of how uneven heating and cooling of air can  set up convection loops that create local winds. Function of the change in temperature and pressure of the air over land in contrast to that 
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This note was uploaded on 06/26/2011 for the course GEOGRAPHY 600-201010 taught by Professor Christopherpost during the Spring '10 term at Kent State.

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el%20nino_chapter%204 - Next time Ocean Atmosphere ENSO and...

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