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Wind; The Movement of Air. Chapter 4, Outcome 2.3. The Rules. In order to understand wind there are 4 rules 1. We name pressure systems as alternating with a low over the equator. 2. Air moves from areas of high pressure to low
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Wind; The Movement of Air Chapter 4, Outcome 2.3
The Rules • In order to understand wind there are 4 rules • 1. We name pressure systems as alternating with a low over the equator. • 2. Air moves from areas of high pressure to low • 3. Air is deflected to the right in the north and to the left in the south • 4. We name winds based on where they come from
Pressure Systems • When air is heated it tends to rise causing low pressure. Cooling air drops causing high pressure. • This causes a sort of convection cell to be created
Air Movement • Air that is moving horizontally is called wind. • Wind always moves from areas of high pressure to low pressure • This happens as air from the high rushes in to replace air that is rising from the earths surface
Coriolis Effect • This law says that in the northern hemisphere, free moving objects will appear to deflect to the right while in the southern hemisphere its to the left. • This occurs because the earth is rotating
Coriolis Effect….. • Remember that the wind turns to the left or right relative to its direction. The diagram to the right is correct. Does it make sense?
Wind Names • Finally we name the winds from where they come from
Local Winds…..Land and Sea • A land breeze works the same as a global wind • Here air over the water is warmer and land is cool • Air over the water is rising and air from the land moves toward the water (high to low) • Its called a land breeze because the air comes from….
Local Winds…..Land and Sea • A sea breeze occurs when the land is warm and the sea is cooler (daytime) • Air over the land is rising and air from the water moves toward the land (high to low) • Its called a sea breeze because the air comes from….
Monsoons • Parts of the world have wet and dry seasons because of seasonal rains. • These are called monsoons and are caused by the same things as winds. • Air moves from highs to lows and if it is coming from the water we get wet seasons. • Later in the year the pressure changes place and we get a dry season….. Take a look!!!!
Monsoons • In summer the land heats up and so the air rises causing a low. The water heats slower so it is a high. The wind moves from the water making it the wet season • In winter the water heats up and so the air rises causing a low. The land cools quickly so it is a high. The wind moves from the land making it the dry season
