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15 Cards in this Set

  • Front
  • Back
As was mentioned last chapter deep ocean current is driven by
density contrasts.
what gradient drives deep ocean currents? how fast are they?
thermohaline circulation

Slow; 1-2m/day
What are the four regions of water masses?
Surface water (ABOVE 200)
intermediate water (200-1500)
Deep water (1500-BOTTOM)
water masses and mixabilit
water masses do not mix readily. there is a reason they are where they are... they are density stratified and wont mix.
deepwater masses occur in three locations (major downwellling)
1.) Weddel sea
2.) Norwegian sea
3.) Ross sea
Deep water masses form especially at high latitudes because
there is no thermocline (all water is cold)
Thus we say that in the Weddel sea...
In the norwegian sea...
weddel sea is where cold water gets salty

Norwegian is where salty water gets cold.
antartic bottom water

-where ____ gets ____
-forms where
-what happens?
cold water gets salty

weddel sea (antartica)

Earth's most dense water mass

As ice sheets freeze cold water gets saltier

North atlantic deep water

-forms from
- where ___ gets ___.
Gulfstream water

salty water gets cold.

Ocean Conveyor Belt” - where is water coming up and down
Water goes down in the west atlantic and travels across to the west pacific where it comes up and back east toward the atlantic.
Deep Water circulation time of the ocean =
1000 years
Average age of a water mass =
400 years (the time since the water was last on the surface)
As deep water masses travel from Atlantic To Pacific….
we expect to see CO2 increase as water is lower and less photosynthesis can occur.
Since CO2 levels are higher in the pacific, carbonate preservation is
hindered. Thus dissolution of carbonate is more common in the pacific than in the atlantic
Day after tomorrow effect is caused because...
Melting of glaciers causes a lens of freshwater to cover the N. Atlantic whcih could shut down thermohaline circulation and therefore deep ocean circulation. this causes less distribution of heat and a mini ice age...