Global Winds and Ocean Currents by 05pHue

VIEWS: 45 PAGES: 27

									8.10A recognize that the Sun provides the energy that drives convection
within the atmosphere and oceans, producing winds and ocean currents.
               Warm Up
 Turn to your partner and answer the question:
    “What causes the wind?”
 Together, select the explanation you both think
  is the most accurate.
 Share with the class!
 Convection
Currents in Air

 Turn to your partner and finish the following sentences:

         Observation                          Inference
  I notice that…..                    I think……because……..

  When the light is turned off, I predict….
transfer of heat by the movement of
warmed matter; hot air rises, cool air
                sinks
Hot Air is Less Dense! (so it rises)
Force = Mass X Acceleration

       Gravity pulls with more force on
               heavier objects!




                                  The Bigger They Are,
                                  The Harder They Fall!
  What Can
Convection Do?
CONVECTION
CONVECTION
Moves air in the atmosphere!
CONVECTION
Wind over the
shore changes
   direction
  because of
   EARTH’S
   UNEVEN
 WARMING &
  COOLING!
What Causes Wind?
Bill Nye’s Explains Wind in 2 minutes!
http://www.youtube.com/watch?v=uBqohRu2RRk&feature=related




Bill didn’t use the word
 “convection”… but he described it!

How did he demonstrate convection?
     What About
 Convection in Water?
 Water and air are both fluids.
 They both move due to convection!
 Just like air, when liquid water is heated, it expands,
  becomes less dense, and rises.
      Side note: Water is different, however, because of it’s unique
      structure as a solid. Ice is actually less dense than liquid water
      whereas other substances are most dense as solids!
CONVECTION IN LIQUIDS!
CONVECTION
  causes deep
 ocean currents!
     CONVECTION
       DEMOS!
           - Tea Bag “Rocket”
http://www.youtube.com/watch?v=UUYV-h1gCJc
            - Colored Water
http://www.youtube.com/watch?v=G9QJ1vv2WyM
http://www.youtube.com/watch?v=7xWWowXtuvA
Global Winds     Convection causes
               the rise and fall of air
                in the atmosphere…



               But what causes the
                  other patterns
                    (easterlies,
               westerlies, etc) in the
                  global winds?
       v
Jet Streams




          http://www.pbs.org/wgbh/nova/balloon/scie
                      nce/jetstream.html
Global Wind Pattern Challenge!
 If you wanted to fly a hot air balloon around
 the world in the shortest amount of time,
 which route would you take?
Coriolis Effect
 Why do the arrows face the opposite way in the Northern
 and Southern Hemisphere?
Coriolis Effect
 YouTube: Coriolis Effect
LAB: Convection In a Cup
  For each test, draw and record your observations!
     Ocean Currents
and Coastal Temperatures
Inland vs. Coastal Cities
 Ocean Currents
BrainPop:
http://www.brainpop.com/science/earthsystem/oceancurrents/


What is the name of this current?

It carries warm water from the
Gulf of Mexico!
Why aren’t there straight lines
between the temperature zones?
Coriolis Effect… again!

 The direction of
  surface ocean
     currents
 affected by the
  Coriolis effect!
Ocean Currents

								
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