1. Warm-up Week 4
The energy that drives surface ocean currents comes from ____.
a. wave action c. temperature differences
b. wind d. salinity variations
Ocean currents that move toward the poles are ____.
a. warm in the Northern Hemisphere and cold in the Southern Hemisphere
b. cold
c. warm
The influence of cold currents is mostly felt in the ___.
a. tropics c. higher latitudes during winter
b. higher latitudes d. middle latitudes during winter
during spring

2. “Waves & Tides”
16.2

3. How heavy is water?
How would it feel if all this water fell on you?

4. Movement of Ocean Water
Moving water is Powerful!
Waves
Energy moving between ocean and atmosphere.
Transfer energy over great distances!
Tides
Changes in sea level

5. Review: What causes waves?
Wind Friction!
Coriolis Effect
Density changes
Q: What caused these waves?
Must add energy to create waves.

6. Wave Characteristics
Wavelength (L)
Crest
Height (H)
Trough

8. Wave “Period” Describe the period of these waves.
Time for 1 wavelength to pass a fixed point.
At the beach you see a small child getting sucked out into the ocean by a strong current. You swim to save the child but are pushed back by wave after wave that comes crashing toward the shore; one after the other.
Describe the period of these waves.

9. Longest Wavelength?
Longest Period?

10. Height, Wavelength & Period…
…determined by:
Wind Speed
Time wind has blown
Fetch
distance wind blows over water

11. Tides. Changes in Sea L____ Cause = gravity from Moon (& Sun!)
EVEL
“Tidal Range”

13. Spring Tide = Moon & Sun together = High
Neap = Opposites = Low

14. Tidal Patterns Diurnal Semidiurnal Mixed 1 high, 1 low 2 H, 2 L
Unequal Highs & Lows

15. What are YOU Lookin’ at?!