Warm-up
You do not have to copy the question!

•	Explain what density is in your own words.

•	Why do you think hot water floats on top of cold water?

•	Why might the density of ocean water change as you move away from the equator?

“Ocean Circulation”
16.1
What does it mean to “circulate?”
Ocean water is always moving!
What causes water movement?
Forces!
–	Push or Pull
•	Wind
–	Friction
–	Surface currents

•	Earth’s Rotation

•	Density
In which ways does water move?
Surface Circulation
•	Surface Current
–	Water in horizontal motion
–	Caused by wind friction!

•	Gyre
–	“Gyros” = circle
–	Huge surface current!
–	5 global gyres.
5 Ocean “Gyres”

	Why 
is his jacket flying back?

Wind!
Friction!
Wind causes currents!
Coriolis Effect (also) causes currents!
•	Earth’s rotation
–	W  E 

•	“Bends” motion of:
–	Wind
–	Water

Example:
•	Shoot a rocket from Equator to North Pole.

•	Earth continues to spin

•	“Bends” path
Currents affect climate!
Transfer Heat!
Other currents?!
Deep Ocean Circulation!
–	Below ↓

Density Currents
–	↑Density =

Caused By:
•	Latitude
•	Evaporation = __ Salinity = __ Density
Global Conveyor Belt