Currents What is a current? Are there different types of currents? What causes currents? Why are currents important? What are some major currents?

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Presentation transcript:

Currents What is a current? Are there different types of currents? What causes currents? Why are currents important? What are some major currents?

Cool Current Facts The Gulf Stream current transports ten- thousand times as much water as the Mississippi river. The Gulf Stream flows as fast as 2m/sec or about 4 miles per hour. If caught in this current you could be carried almost a hundred miles in one day.

What is a Current? A current is defined as a large mass of continuously moving ocean water.

What Causes Currents Wind Density (salinity/temperature) Topography (coasts) Coriolis effect (earth’s rotation)

Coriolis Effect The rotation of the earth causes moving objects to veer to the right in the northern hemisphere, to the left in the southern hemisphere. Objects near the equator are moving much faster than objects near the poles.

Coriolis Effect

Types of Currents Surface (wind driven) Deep (density driven) Vertical (wind/density driven)

Surface Currents Most visible current Occur in the top 1 km of the ocean Produced by wind and redirected by land and the Coriolis effect This Results in a large circular rotation called a Gyre

Gyre

Create a Current Map Label the continents Label the oceans Using your knowledge of surface currents determine and label where the five major Gyres and one circumpolar current are located. Use arrows to show the direction of flow. Label the major currents.

Major Currents California Current Kuroshio Current North and South Equatorial Current West Wind Drift Gulf Stream Peru Current

Global Currents

Thanks to: Images: shower.htm ~jean/research.html Information: hy_currents_1.html