6 WindWater moves from high pressure to low pressure areas (just like wind).Winds blow across the surface of the water, causing friction.The water piles up because the surface currents flow slower than the winds.
7 GravityAs water piles up and flows from high to low pressure, gravity will pull down on the water.This forms dunes or mounds of water.The Coriolis Effect causes the water to curve.
8 The Coriolis Effect Causes water to: Curves to the right in the Northern HemisphereCurves to the left in the Southern Hemisphere
12 Gulf Stream A strong surface current Begins at the tip of Florida Flows up the eastern coastline of the U.S.Crosses the Atlantic OceanCauses warmer climate in NW Europe
13 Gyres Dunes or mounds of water at the surface and they flow in circles Produce enormous circular currentsFive major locations:North Pacific – clockwise-cwSouth Pacific – counterclockwise-ccwIndian Ocean – ccw (counterclockwise)South Atlantic – ccw (counterclockwise)North Atlantic – cw (clockwise)
20 Upwelling http://www.youtube.com/watch?v=XV90dy0ns1U lab demo NASAanimationBill Nye 2 minutes
21 The Great Ocean Conveyor: Helps maintain Earth’s Balance
22 Deep Water Currents Make up about 90% of oceans’ water Differences in density cause them to move.Differences in density are related to temperature and salinity. (salty)At high latitudes, they sink deep into the ocean basins.Temperatures are so cold, they cause the density to increase.
23 Reflective Question- How are ocean currents produced? Wind pushing surface water allowing denser water to surface, causing a convection current.Denser water sinking (cold from polar region) and less dense water rising (equatorial region).