Motion and the Atmosphere

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Presentation transcript:

Motion and the Atmosphere Earth’s Motion and the Atmosphere

As you should know… The Earth: Rotates Revolves around the Sun Revolves with the Sun around the Center of our galaxy Moves with the galaxy out from the Big Bang It also Precesses!

Precession The direction that the Earth’s Axis points changes gradually in a circle every 26,000 years It precesses like a top Currently it points toward Polaris In 14,000 AD it will point at… Vega

Remember Earth’s Rotation… All parts rotate once in 23 hrs 56 min But the Tangential Velocity varies with latitude It is about… 1000 mph at the Equator 800 mph here in Culver City 0 mph at the poles

The Coriolis Effect Due to Earth’s rotation an object trying to go directly from Pole to Equator will be deflected to the West. One going from Equator to Pole will be deflected East. This causes…

Ocean Currents to circle clockwise in the Northern Hemisphere (counterclockwise in the southern)

Storms to circle counterclockwise in the northern hemisphere Clockwise in the southern

Atmospheric Convection currents are deflected into prevailing winds which divide the atmosphere into bands moving in alternating directions