Oceanography slides 4+5
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Name three reasons why the Sea-Level varies.
1) Local sea-level can vary because of waves, tides, winds, and due processes that occur at seasonal.
- 2) Global sea level varies because of total volume of water in ocean.
- - Inputs: rainfall, snowfall, rivers, volcanism
- - Outputs: evaporation, freezing, subduction
- - Temperature (Water expands and contracts as a function temp.)
- 3) Shape of the Ocean basin
- - Tectonics
- - Sediment inputs or removal
- - Glacial isostacy
tendency of a material to change volume in response to a change in temperature
The biggest change in the ocean volumne is caused by?
formation/destruction of ice caps and glaciers
the extent to which a substance that reflects light from light sources such as the sun is called?
___ of all fresh water on Earth is held in Antarctic Ice Cap.
the change of direction of the axis, not its tilt.
What reconstructed our sea-level change?
A combination of sediment dating, location of marine fossils and sedimentary structures.
the O18 : O16 can be used to?
to estimate extent of polar ice and sea-level
During glacial periods snow fall is stored in ice caps so
polar ice becomes enriched in O16... and ocean is depleted of O16.
How can ocean circulation impact sea-leve?
cold dense water formed near the poles, sinks and spreads along the bottom of the ocean.
What are the two different Coasts and give some examples.
- Erosional coasts-
- 1) small pocket beaches
- 2) Sea cliffs
- 3) Sea Stacks and arches
- 4) Caves
- 5) Wave-cut platform
- Depositional -
- 1) Long, sandy beaches
- 2) Barrier islands
- 3) Bay, lagoons and estuaries
- 4) Sand spits
- 5) tombolos
- 6) River Deltas
Percolation increases with increasing grain size, so beaches with courser sediments tend to be ______.
The Bruun Rule
The equilibrium between offshore sand and on. Erosional sediment is deposited toward the ocean slope.
How do Barrier islands migrate?
Rising sea-level pushed barrier islands toward land because of overwash mainly during storms.
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