WIND IN THE ATMOSPHERE

WHAT CAUSES WIND?

• Wind is the movement of air caused by differences in air pressure
• The temperature is not the exact same everywhere, and the density of air is different throughout
• When denser are sinks, it places greater pressure on the surface of earth
• The air moves from areas of higher air pressure to lower air pressure, causing wind

HIGH AND LOW PRESSURE

• Air moves in circular patterns called convection cells
• The farther away air is from the equator the colder it is
• When the air moves closer to the equater, it becomes denser
• The dense air then sinks and causes more pressure to the earth than less dense air

CORIOLIS EFFECT

• Movement of an object to earths rotation

GLOBAL WINDS

• Wind systems that occur at or near earths surface
• Major wind systems are polar easterlies, westerlies and trade winds

LOCAL WINDS

• The movement of air over short distances

BREEZES

• Sea breeze comes from the ocean
• Valley and mountain breezes come from land