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Download Weather Ch 1 Sec 3 Wind Notes
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Weather Chapter 1 Section 3! ! Atmospheric Pressure and Winds! Topics Wind! ! ! ! Movement of Air! ! ! ! ! ! ! ! ! ! ! Pressure Belts! ! ! ! ! ! ! Convection Cells! ! ! ! ! Coriolis Effect! ! Effect on Winds! ! ! ! ! ! ! ! ! ! ! ! ! ! Name____________________! Notes, Diagrams, Drawings moving air! ! ! ! Air move due to pressure differences. The greater the pressure difference the faster the wind. This is caused by unequal heating of the earth’s surface. ! ! Ex: Air at the equator is warm, less dense, and therefore rises creating a low pressure area. Air at the poles is cold, more dense, and therefore sinks creating an area of high pressure. ! ! Air moves from high pressure to low pressure areas.! ! Due to the fact that as air rises into the atmosphere it gets cooler air from the equator does not make it all the way to the pole. It begins to sink at about 30 degrees north and south. This creates a belt of high pressure around the earth. ! ! There are 3 convections cells north of the equator and 3 south. Convection cells are the circular air pattern of rising warm and sinking cold air. Wind is created as air moves across the surface from high pressure to low pressure areas. ! ! The curving of moving objects due to the earth’s rotation. ! ! Winds curve to the right in the northern hemisphere and south in the southern hemisphere.! ! Topics Global Winds! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Trade Winds! Doldrums! Notes, Diagrams, Drawings Patterns of air circulation that move across the whole earth. ! Locate between equator and 30 degrees north and south. Carried ships from Europe to the Americas. Blow from east.! ! A low pressure area of warm rising air with little wind movement.! Horse Latitudes! ! 30 degree north and south latitude. Formed by cool dry sink air. Creates a band of deserts around the earth. ! Westerlies! Polar Easterlies! Jet Stream! ! Between 30 and 60 degrees north and south. Blow from the west. Effects our weather patterns.! ! ! 60 degrees north and south to the poles. Blow east.! ! ! ! Narrow belts of high speed air in the upper troposphere / lower stratosphere. Do not follow regular patterns.! ! Jet Stream Effect Can move air masses around and move large storms.! on Weather Patterns! ! ! ! ! ! Local Winds! Winds that generally blow short distances and can come ! from any direction. ! ! ! Sea and Land Breeze! Created by the uneven heating and cooling of land and ! water. Sea breeze blows from the sea during the day, ! land breeze from the land at night.! ! ! ! ! ! ! Mountain Breeze! Valley breezes blow up a mountain during the day ! because the valley floor heats up. Mountain breezes blow down the mountain at night because mountains cool faster.
