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Ocean Ocean CurrentsCurrentsChapter 16.1 Chapter 16.1
Ocean CurrentsOcean Currents• Masses of ocean water that flow from one place to
another.
CurrentsCurrents• Two types of ocean currents:
– Surface currents– Deep currents
Surface CurrentsSurface Currents
• Develop from friction between the ocean and the wind that blows across the surface.
Currents that ONLY move horizontally in the UPPER part of the Oceans surface
Color your surface current map using the Key on your Surface Current Map!
BLUE = Cold CurrentRED = Warm Current
Global Winds Create Global Winds Create Currents Currents
Draw and Label a Global Winds Diagram according to this diagram.
GyresGyres• Huge circular-moving current systems that are driven by
the global winds.• 5 main gyres!
Gyre Plastic Gyre Plastic PollutionPollution
What if this was YOUR What if this was YOUR home?home?
Locate the 5 main Gyres on your surface current map.
Label the Gyres on your map
Why?Great Britain and Alaska are at similar latitudes, yet Great Britain is about 25 degrees warmer than Alaska…
Ocean Currents and Ocean Currents and ClimateClimate Gulf Stream is a great example of bringing warmth to a high
latitude.It brings heat from the equator region to areas more North
and South
Deep Deep CurrentsCurrents• VERTICAL (up and down) currents of ocean
water• Caused by differences in water density• Dense water SINKS• LESS dense water RISES
Deep CurrentsDeep Currents• A result of temperature or salinity changes
temp = sinks salinity = density sinks
Color in your Global Conveyor
Belt diagram
TidesTidesChapter 16.2
What is a What is a Tide?Tide?• The rise and fall of the sea level.
The gravitational pull The gravitational pull of the Moon and the of the Moon and the Sun make the tidesSun make the tides
• The Sun is much larger than the Moon but has ONLY about ½ of the power of the Moon on tides
Sun Vs. MoonSun Vs. Moon
Because the Moon is CloserWHY?
Types of Tides• Two types of tides:
Spring Tides
Neap Tides
Spring TidesSpring Tides• The Sun, Moon and Earth are in a straight line.
Spring TidesSpring Tides• Highest High Tides and Lowest Low Tides• Why?
Spring TideSpring Tide• ALL Gravitational Force!!
Neap TidesNeap Tides • When the Sun Moon and Earth are at right angles.
Neap TidesNeap Tides• Tidal Range is the smallest. (NOT MUCH
DIFFERENCE between high tide and low tide!)• Why?
Neap Tide Neap Tide ForcesForces• TWO different forces
• Gravitational and Centrifugal
Centrifugal
Spring Tide vs. Spring Tide vs. Neap TideNeap Tide
Spring Tide Force is all in one direction
Neap Tide Force is from two directions
at the same time
HIGHEST HIGHS & LOWEST LOWS LOW HIGHS & HIGH LOWS
In the boxes at the bottom of your notes
Tide Animationshttps://www.youtube.com/watch?v=5ohDG7RqQ9I
https://www.youtube.com/watch?v=sMKvqMUZwV4
https://www.youtube.com/watch?v=OP0cpXpw8yk
How Tides Work
Time Lapse High Tide
The Bay of Fundy