Earth science 16.1

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Earth science 16.1

  1. 1. 16.1 Ocean Circulation<br />
  2. 2. Ocean Current <br />Mass of ocean water that flows from one place to another.<br />
  3. 3. Surface Current <br />Movement of water that flows horizontally in the upper part of the ocean’s surface.<br />
  4. 4. Gyre <br />The large circular surface current pattern found in each ocean.<br />
  5. 5. Coriolis Effect <br />The apparent deflective force of Earth's rotation on all free moving objects, including the atmosphere and oceans; Deflection is to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. <br />
  6. 6. Upwelling <br />The rising of cold water from deeper layers to replace warmer surface water that has been moved away.<br />
  7. 7. Density Current<br />Current of ocean water that results from density differences among water masses.<br />
  8. 8. Key Concept <br />How do surface currents develop?<br />Surface currents develop from friction between the ocean and the wind that blows across its surface.<br />
  9. 9. Key Concept <br />How do ocean currents affect climate?<br />When currents from low-latitude regions move into higher latitudes, they transfer heat from warmer to cooler areas on Earth.<br />
  10. 10. Key Concept <br />Why is upwelling important?<br />Upwelling brings greater concentrations of dissolved nutrients, such as nitrates and phosphates, to the ocean surface.<br />
  11. 11. Key Concept<br />How are density currents formed?<br />An increase in seawater density can be caused by a decrease in temperature or an increase in salinity.<br />

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