Transcript Global Winds and Ocean Currents

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
I notice that…..
Inference
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