OCEAN CURRENTS.

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Presentation transcript:

OCEAN CURRENTS

What causes OCEAN currents? Use 1 book per table. Go to pg. 429 On your lab table, draw the ocean currents. Include continents USE COLOR

What causes currents? Prevaling Winds: winds that blow from a single general direction over a particular point on the Earth's surface. Examples: Westerlies Trade Winds

Wind belts

What causes currents? Changes in Water Temperature: Cold water sinks, warm water rises. This creates a movement of water based on radiation from the sun.

What causes currents? Coriolis Effect Deflection of winds and ocean currents caused by Earth’s rotation

What causes currents? Changes in Salinity Saline water (salty water) becomes more dense and sinks. Causes deep water currents.

What causes currents? Uneven Heating Differences in solar radiation from the sun causes ocean water to heat at different intensities, causes the rising and sinking of water. WARM water expands and rises COLD water contracts and sinks

What causes currents? Basin Shape The continents form a barrier which causes ocean water to be deflected and divided.

9.02 Label major surface currents HOMEWORK Use your book p. 429 to do this!

Currents regulate Earth’s climate

Ocean Terms: Gyre: large system of rotating ocean currents, involved with large wind movements. Boundary Current: ocean currents with dynamics determined by the presence of a coastline. Western + Eastern

Ocean Gyres

Deep Currents Thermohaline circulation- caused by density and temp. difference Salty water sinks; cold water sinks Global conveyor belt

Gulf Stream

Ocean Currents Lab:

EARTH SCIENCE FINISH: Your Ocean Currents Lab Use books + Obj.’s When done, show Mr. Shelson Pick up Quiz review (due tomorrow) YES…Homework if not complete!

Where does Ocean Salt come from?

Thermocline

Thermocline