Ocean current s
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Ocean Current s. Ocean Currents. Warm currents flow away from the equator. Cold currents flow toward the equator. Factors Influencing Currents. Sun Wind Coriolis Gravity. Sun. Energy from the Sun heats the water. Warm water is less dense that cold water.

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Ocean Current s

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Ocean current s

Ocean Currents


Ocean currents

Ocean Currents

  • Warmcurrents flow away from the equator.

  • Cold currents flow toward the equator.


Factors influencing currents

Factors Influencing Currents

Sun

Wind

Coriolis

Gravity


Ocean current s

Sun

Energy from the Sun heats the water.

Warm water is less dense that cold water.

Warm water rises, and cold water sinks.

As warm water rises, cold water moves it to replace it.


Convection cycle

Convection Cycle


Ocean current s

Wind

Just as wind moves from high pressure to low pressure areas, so does the water.

Winds blow across the surface of the water, causing friction.

The water piles up because the surface currents flow slower than the winds.


Ocean current s

Wind


Gravity

Gravity

As water piles up and flows from high pressure to low pressure, gravity will pull down on the water.

This forms vertical columns or mounds of water.

The Coriolis Effect causes the water to curve.


The coriolis effect

The Coriolis Effect

Causes water to move to the right in the Northern Hemisphere

Causes water to move to the left in the Southern Hemisphere


The coriolis effect1

The Coriolis Effect


Surface currents

Surface Currents

Make up 10% of oceans’ water

Up to maximum depth of 400 m

Surface ocean currents are caused by the surface wind patterns.


Surface currents1

Surface Currents


Gyres

Gyres

  • Vertical columns or mounds of water at the surface and flow around them

  • Produce enormous circular currents

  • Five major locations:

    • North Pacific - clockwise

    • South Pacific - counterclockwise

    • Indian Ocean - counterclockwise

    • South Atlantic - counterclockwise

    • North Atlantic - clockwise


  • Oceanic gyres

    Oceanic Gyres


    Gulf stream

    Gulf Stream

    A strong surface current

    Begins at the tip of Florida

    Flows up the eastern coastline of the U.S.

    Crosses the Atlantic Ocean

    Causes warmer climate in NW Europe


    Upwelling

    Upwelling

    Surface waters blow to the right of the wind.

    As less dense, surface water moves off shore, cold, deep, denser waters come to the surface to replace them.


    Upwelling1

    Upwelling


    The great ocean conveyor helps maintain earth s balance

    The Great Ocean Conveyor:Helps maintain Earth’s Balance


    Deep water currents

    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.

    At high latitudes, they sink deep into the ocean basins.

    Temperatures are so cold, they cause the density to increase.


    Reflective question

    Reflective Question

    How are ocean currents produced?


    El nino

    El Nino

    • Abnormally highsurface ocean temperatures off the coast of South America

    • Causes unusual weather patterns across the globe


    El nino1

    El Nino

    Starts because the easterly trade winds weaken and allow the warm waters in the Western Pacific to move east toward South America

    This changes where the convection current occurs.

    Causing rain where it usually doesn't occur and drought where it usually rains


    El nino winter

    El Nino Winter


    El nino summer

    El Nino Summer


    La nina

    La Nina

    • Abnormally lowsurface ocean temperatures off the coast of SouthAmerica

    • Causes unusualweather patterns across

      the globe


    Ocean s effect on climate

    Ocean’s Effect on Climate

    Ocean currents move more slowly than winds.

    Oceans hold more heat than the atmosphere and land.

    Cold currents will cause nearby coastlines to be cooler.

    Warm currents will cause nearby coastlines to be warmer.

    Where do the cold currents come from? The warm currents?


    Predictable patterns how do these currents affect the climate of the coastline

    Predictable Patterns How do these currents affect the climate of the coastline?


    Reflection questions

    Reflection Questions

    How do our oceans impact climate?


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