slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Ocean Currents PowerPoint Presentation
Download Presentation
Ocean Currents

Loading in 2 Seconds...

play fullscreen
1 / 37

Ocean Currents - PowerPoint PPT Presentation


  • 61 Views
  • Uploaded on

Ocean Currents. A penguin walks into a bar and asks the pharmacist for  Chapstick . After grabbing the Chapstick , the pharmacist asks the penguin, “ How would you like that ?” The penguin replies, “ Just put it on my bill.”. Why is Ocean Circulation Important?.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Ocean Currents' - irving


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide2

A penguin walks into a bar

and asks the pharmacist for 

Chapstick.

  • After grabbing the Chapstick,

the pharmacist asks the penguin,

“How would you like that?”

  • The penguin replies,

“Just put it on my bill.”

why is ocean circulation important
Why is Ocean Circulation Important?
  • Transport heat
    • Equator to poles
  • Transport nutrients and organisms
  • Influences weather and climate
  • Influences commerce
major ocean currents
Major Ocean Currents
  • An Ocean Current is a large volume of water flowing in a certain direction.
  • Wind-driven currents are called surface currents.
  • Surface currents carry warm or cold water horizontally across the ocean’s surface
slide5

Ocean Currents

  • Surface Currents
    • The upper 400 meters of the ocean (10%).
  • Deep Water Currents
    • Thermal/Salinity currents (90%)
transport by currents
Transport by Currents
  • Surface currents play significant roles in transport heat energy from equatorial waters towards the poles
  • Currents also involved with gas exchanges, especially O2 and CO2
  • Nutrient exchanges important within surface waters (including outflow from continents) and deeper waters (upwelling and downwelling)
  • Pollution dispersal
  • Impact on fisheries and other resources
slide8

90o

60o

Surface Currents

  • Forces
  • Solar Heating (temp, density)
  • Winds
  • Coriolis

30o

0o

30o

60o

90o

coriolis effect
Coriolis Effect
  • The Coriolis Effect is the movement of wind and water to the right or left that is caused by Earth’s rotation.
  • It causes fluids such as air and water to curve to the right in the Northern hemisphere, in a clockwise direction.
  • The Coriolis effect also cases fluids to curve to the left in the southern hemisphere, in a counterclockwise direction.
coriolis effect1
Coriolis Effect
  • The shapes of continents and other land masses affect the flow and speed of currents.
  • Currents form small or large loops and move at different speeds, depending on the land masses they contact.
slide13

Duckie Progress

  • January 1992 - shipwrecked in the Pacific Ocean, off the coast of China
  • November 1992 - half had drifted north to the Bering Sea and Alaska; the other half went south to Indonesia and Australia
  • 1995 to 2000 - spent five years in the Arctic ice floes, slowly working their way through the glaciers2001 - the duckies bobbed over the place where the Titanic had sunk
  • 2003 - they were predicted to begin washing up onshore in New England, but only one was spotted in Maine
  • 2007 - a couple duckies and frogs were found on the beaches of Scotland and southwest England.
surface and deep sea current interactions
Surface and Deep-Sea Current Interactions

“Global Ocean Conveyor Belt”

density currents
Density Currents
  • Density Currents are a type of vertical current that carries water from the surface to deeper parts of the ocean.
  • Density Currents are caused by changes in density rather than wind.
  • Density currents circulate thermal energy, nutrients and gases.
slide18

Thermohaline Circulation

Global ocean circulation that is driven by differences in the density of the sea water which is controlled by temperature and salinity.

slide19

Thermohaline Circulation

White sections represent warm surface currents.

Purple sections represent deep cold currents

great ocean conveyor belt
Great Ocean Conveyor Belt
  • The Great Ocean Conveyor Belt is the name for a model of the large system of ocean currents that affects weather and climate by circulating thermal energy around Earth.
  • In this model, high salinity water cools and sinks in the North Atlantic, and deep water returns to the surface in the Indian and Pacific Oceans through upwelling
great ocean conveyor belt1
Great Ocean Conveyor Belt
  • Scientists estimate that the Great Ocean Conveyor Belt model takes about 1,000 years to complete a cycle.
impacts of weather and climate
Impacts of Weather and Climate
  • Warm-water currents and cold-water currents affect weather and climate in different ways
  • Regions near warm-water currents are often warmer and wetter than regions near cold-water currents
impacts on weather and climate
Impacts on Weather and Climate
  • The Gulf Stream is a warm-water current that affects coastal areas of the southwestern United States by transferring lots of thermal energy and moisture to the surrounding air.
  • The cold California Current affects coastal areas of the southwestern United States.
upwelling
Upwelling
  • Upwelling is the vertical movement of water toward the ocean’s surface.
  • Upwelling occurs when wind blows across the ocean’s surface and pushes water away from an area. Deeper colder water then rises to replace it.
  • Upwelling often occurs along coastlines.
  • Upwelling brings cold, nutrient-rich water from deep in the ocean to the ocean’s surface.
upwelling and downwelling
Upwelling and downwelling

Vertical movement of water

  • Upwelling = movement of deep water to surface
    • Hoists cold, nutrient-rich water to surface
    • Produces high productivities and abundant marine life
  • Downwelling = movement of surface water down
    • Moves warm, nutrient-depleted surface water down
    • Not associated with high productivities or abundant marine life
slide27

upwelling

downwelling

el ni o southern oscillation enso
El Niño-Southern Oscillation (ENSO)
  • El Niño= warm surface current in equatorial eastern Pacific that occurs periodically around December
  • Southern Oscillation= change in atmospheric pressure over Pacific Ocean accompanying El Niño
  • ENSO describes a combined oceanic-atmospheric disturbance
slide29

El Niño

  • Oceanic and atmospheric phenomenon in the Pacific Ocean
  • Occurs during December
  • 2 to 7 year cycle
  • Sea Surface Temperature
  • Atmospheric Winds
  • Upwelling
slide33

Non El Niño

El Niño

1997

slide34

Non El Niño

upwelling

El Niño

Thermocline –

layer of ocean right beneath the “mixed layer” where temperatures decrease rapidly.

slide35

El Niño events over the last 64years

El Niño warmings (red) and La Niña coolings (blue) since 1950. Source: NOAA Climate Diagnostics Center

slide36

World Wide Effects of El Niño

  • Weather patterns
  • Marine Life
  • Economic resources

El Nino Animation