Deep Ocean Currents

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Deep Ocean Currents

  1. 1. Deep-Ocean Currents• Thermohaline Circulation – deep ocean circulation driven by temperature and density differences in water• Below the pycnocline• 90% of all ocean water• Slow velocity© 2011 Pearson Education, Inc.
  2. 2. Thermohaline Circulation• Originates in high latitude surface ocean• Cooled, now dense surface water sinks and changes little.• Deep-water masses identified on temperature–salinity (T–S) diagram – Identifies deep water masses based on temperature, salinity, and resulting density© 2011 Pearson Education, Inc.
  3. 3. Thermohaline Circulation© 2011 Pearson Education, Inc.
  4. 4. T–S Diagram© 2011 Pearson Education, Inc.
  5. 5. Thermohaline Circulation• Some deep-water masses –Antarctic Bottom Water –North Atlantic Deep Water –Antarctic Intermediate Water –Oceanic Common Water• Cold surface seawater sinks at polar regions and moves equatorward© 2011 Pearson Education, Inc.
  6. 6. Conveyor Belt Circulation© 2011 Pearson Education, Inc.
  7. 7. Power From Currents• Currents carry more energy than winds• Florida–Gulf Stream Current System• Underwater turbines – Expensive – Difficult to maintain – Hazard to boating© 2011 Pearson Education, Inc.
  8. 8. End of CHAPTER 7 Ocean Circulation© 2011 Pearson Education, Inc.

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