Ocean Currents and gyres. The “rivers” of the sea. TYPES OF CURRENTS. Surface Currents. Deep Currents. Perpendicular to surface (vertical). Parallel to surface of ocean (horizontal). What causes them?. Wind –the constant blowing of global winds causes surface currents.
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The “rivers” of the sea.
Perpendicular to surface (vertical)
Parallel to surface of ocean (horizontal)
Wind –the constant blowing of global winds causes surface currents.
***Primarily for surface currents.
2) Changes in sea level – underwater mounds and landforms actually push water up or let it fall deeper down. This causes pressure differences that make water move.
3) Density variations – density differences cause water to want to move from one area to another. (vertically)
***primarily for deep currents.
In the northern hemisphere, gyres turn right (clockwise)
In the southern hemisphere, gyres turn left (counter-clockwise)
Curves to the right of original direction.
Curves to the left of original direction.
-Density changes due to salinity and temperature changes will cause water to sink
-When water sinks, the area that it left now needs to be replaced.
-This water is replaced by deep ocean water, causing deep ocean currents.
We can literally float around in them and make observations.
We can float a buoy in one spot and measure the waters movement as it passes.
Global weather/climate (heat)
Affects shipping and vessels