ocean currents powerpoint

14
OCEAN CURRENTS

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ocean currents-marine ecology

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Page 1: Ocean Currents PowerPoint

OCEAN CURRENTS

Page 2: Ocean Currents PowerPoint

current •mass of water moving from

one place to another•like a river within the ocean

Page 3: Ocean Currents PowerPoint

importance:

•moves drifting organisms from place to place – plankton, disperse young

•carries eggs and larvae of organisms that have external fertilization

•brings food, oxygen•carries away waste,pollutants

Page 4: Ocean Currents PowerPoint

three types of currents

• surface currents

• thermohaline circulation (currents)

• wind-driven vertical currents (upwelling)

Page 5: Ocean Currents PowerPoint

surface currents•wind driven currents•occur at surface•horizontal currents•caused by friction between wind

and water - wind pushes water

Page 6: Ocean Currents PowerPoint

surface currentsCoriolis effect•causes moving objectsin northern hemisphereto veer clockwise•causes moving objectsin southern hemisphereto move counter-clockwise

Page 7: Ocean Currents PowerPoint

surface currentsCoriolis effect

Page 8: Ocean Currents PowerPoint

surface currentsgyre•massive circular system of wind-driven

surface currents•cover whole oceans•clockwise inNorthern hemisphere•counter-clockwisein Southernhemisphere

Page 9: Ocean Currents PowerPoint

surface currentseddies = warm core ringsbreak off of currents and

transport organisms elsewhere

Page 10: Ocean Currents PowerPoint

thermohaline circulation (currents)•causes deep ocean circulation•vertical currents•temperature and salinity

cause water density differences•due to density differences,

water masses rise and fall

Page 11: Ocean Currents PowerPoint

thermohaline circulation (currents)

↑ salinity = ↑ density = water mass sinks↑ temp. = ↓ density = water mass floats

Page 12: Ocean Currents PowerPoint

thermohaline circulation (currents)

Page 13: Ocean Currents PowerPoint

thermohaline circulation (currents)

•when combined with surface currents, results in conveyor belt movement of water around globe

Page 14: Ocean Currents PowerPoint

wind driven vertical currents = upwelling•wind blows, moves water

away, causes new water to rise up to replace it