GLOBAL WINDS Copyright 2014 all rights reserved www

WHAT IS WIND? • Wind is the movement of air caused by an uneven heating of the Earth’s surface. Image from: http: //openclipart. org/image/300 px/svg_to_png/67723/wind_blowing_cloud. png © Copyright 2014 - all rights reserved www. cpalms. org

• Heat from the sun heats the surface of the Earth. • This heat arrives to Earth in the form of radiation. • Radiation is the transfer of energy by electromagnetic waves. • Radiation can transfer heat without direct contact between objects. • Solar radiation originates from the sun. © Copyright 2014 - all rights reserved www. cpalms. org WHAT HEATS EARTH’S SURFACE? Image from: https: //c 1. staticflickr. com/5/4073/4809356121_f 37009063 a_z. jpg

© Copyright 2014 - all rights reserved www. cpalms. org COLLABORATION TIME TWO MINUTES

• Winds do not travel straight from the equator to poles. • Due to the cycling of hot, low pressure and less dense air with cold, high pressure, more dense air, wind travels via convection cells. Convection cells are: • Pockets of cycling warm, less dense, low pressure air with cool, denser high-pressure air. • Pressure difference results in global movement of air. © Copyright 2014 - all rights reserved www. cpalms. org CONVECTION CELLS Image from: http: //upload. wikimedia. org/wikipedia/commons/c/cd/Atmosph. Circ 2. png

WHAT ARE GLOBAL WINDS? • Global winds are winds that are produced by the movement of air between the equator and the poles. • Image from http: //upload. wikimedia. org/wikipedia/commons/1/18/Map_prevailing_winds_on_earth. png © Copyright 2014 - all rights reserved www. cpalms. org

MAJOR GLOBAL WINDS • Polar Easterlies • Westerlies (prevailing) • Trade winds • Doldrums

DOLDRUMS • Little or low wind area near the equator where warm air rises. © Copyright 2014 - all rights reserved www. cpalms. org Image from: http: //upload. wikimedia. org/wikipedia/commons/c/cd/Atmosph. Circ 2. png

TRADE WINDS • Winds that blow from the horse latitudes toward the equator. © Copyright 2014 - all rights reserved www. cpalms. org Image from: http: //upload. wikimedia. org/wikipedia/commons/c/cd/Atmosph. Circ 2. png

HORSE LATITUDES • Little or low wind area where air is falling. • Found at 30 degrees latitude. © Copyright 2014 - all rights reserved www. cpalms. org Image from: http: //upload. wikimedia. org/wikipedia/commons/c/cd/Atmosph. Circ 2. png

WESTERLIES (PREVAILING) • Winds that blow from the west to the east. • Found between 30 and 60 degree latitudes. © Copyright 2014 - all rights reserved www. cpalms. org Image from: http: //upload. wikimedia. org/wikipedia/commons/c/cd/Atmosph. Circ 2. png

POLAR EASTERLIES • Winds that blow away from the poles. • Blows from east to west. • Found between the poles and 60 degrees latitude. Image from: http: //upload. wikimedia. org/wikipedia/commons/c/cd/Atmosph. Circ 2. png © Copyright 2014 - all rights reserved www. cpalms. org