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OCEAN CURRENTS
<ul><li>current   </li></ul><ul><li>mass of water moving from one place to another </li></ul><ul><li>like a river within t...
<ul><li>importance: </li></ul><ul><li>moves drifting organisms from place to place – plankton, disperse young </li></ul><u...
three types of currents <ul><li>surface currents </li></ul><ul><li>thermohaline circulation (currents) </li></ul><ul><li>w...
<ul><li>surface currents </li></ul><ul><li>wind driven currents </li></ul><ul><li>occur at surface </li></ul><ul><li>horiz...
surface currents <ul><li>Coriolis effect </li></ul><ul><li>causes moving objects </li></ul><ul><li>in northern hemisphere ...
surface currents <ul><li>Coriolis effect </li></ul>
surface currents <ul><li>gyre </li></ul><ul><li>massive circular system of wind-driven surface currents </li></ul><ul><li>...
surface currents <ul><li>eddies = warm core rings </li></ul><ul><li>break off of currents and transport organisms elsewher...
thermohaline circulation (currents) <ul><li>causes deep ocean circulation </li></ul><ul><li>vertical currents </li></ul><u...
thermohaline circulation (currents) <ul><li>↑  salinity = ↑ density  = water mass sinks </li></ul><ul><li>↑  temp. = ↓ den...
thermohaline circulation (currents)
thermohaline circulation (currents) <ul><li>when combined with surface currents, results in conveyor belt movement of wate...
wind driven vertical currents   = upwelling <ul><li>wind blows, moves water away, causes new water to rise up to replace i...
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Ocean Currents PowerPoint

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ocean currents-marine ecology

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  1. 1. OCEAN CURRENTS
  2. 2. <ul><li>current </li></ul><ul><li>mass of water moving from one place to another </li></ul><ul><li>like a river within the ocean </li></ul>
  3. 3. <ul><li>importance: </li></ul><ul><li>moves drifting organisms from place to place – plankton, disperse young </li></ul><ul><li>carries eggs and larvae of organisms that have external fertilization </li></ul><ul><li>brings food, oxygen </li></ul><ul><li>carries away waste, </li></ul><ul><li>pollutants </li></ul>
  4. 4. three types of currents <ul><li>surface currents </li></ul><ul><li>thermohaline circulation (currents) </li></ul><ul><li>wind-driven vertical currents (upwelling) </li></ul>
  5. 5. <ul><li>surface currents </li></ul><ul><li>wind driven currents </li></ul><ul><li>occur at surface </li></ul><ul><li>horizontal currents </li></ul><ul><li>caused by friction between wind and water - wind pushes water </li></ul>
  6. 6. surface currents <ul><li>Coriolis effect </li></ul><ul><li>causes moving objects </li></ul><ul><li>in northern hemisphere </li></ul><ul><li>to veer clockwise </li></ul><ul><li>causes moving objects </li></ul><ul><li>in southern hemisphere </li></ul><ul><li>to move counter- </li></ul><ul><li>clockwise </li></ul>
  7. 7. surface currents <ul><li>Coriolis effect </li></ul>
  8. 8. surface currents <ul><li>gyre </li></ul><ul><li>massive circular system of wind-driven surface currents </li></ul><ul><li>cover whole oceans </li></ul><ul><li>clockwise in </li></ul><ul><li>Northern hemisphere </li></ul><ul><li>counter-clockwise </li></ul><ul><li>in Southern </li></ul><ul><li>hemisphere </li></ul>
  9. 9. surface currents <ul><li>eddies = warm core rings </li></ul><ul><li>break off of currents and transport organisms elsewhere </li></ul>
  10. 10. thermohaline circulation (currents) <ul><li>causes deep ocean circulation </li></ul><ul><li>vertical currents </li></ul><ul><li>temperature and salinity cause water density differences </li></ul><ul><li>due to density differences, water masses rise and fall </li></ul>
  11. 11. thermohaline circulation (currents) <ul><li>↑ salinity = ↑ density = water mass sinks </li></ul><ul><li>↑ temp. = ↓ density = water mass floats </li></ul>
  12. 12. thermohaline circulation (currents)
  13. 13. thermohaline circulation (currents) <ul><li>when combined with surface currents, results in conveyor belt movement of water around globe </li></ul>
  14. 14. wind driven vertical currents = upwelling <ul><li>wind blows, moves water away, causes new water to rise up to replace it </li></ul>
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