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Warm-up Week 4

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

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Warm-up Week 4

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  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 movingbetween 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

  7. Wave “Period” Timefor 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.

  8. Longest Wavelength? Longest Period?

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

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

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

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

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