Oceanography slides 4+5

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  1. Name three reasons why the Sea-Level varies.
    Local -
    global -
    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
  2. Thermal Expansion:
    tendency of a material to change volume in response to a change in temperature
  3. The biggest change in the ocean volumne is caused by?
    formation/destruction of ice caps and glaciers
  4. the extent to which a substance that reflects light from light sources such as the sun is called?
  5. ___ of all fresh water on Earth is held in Antarctic Ice Cap.
  6. Precession is?
    the change of direction of the axis, not its tilt.
  7. What reconstructed our sea-level change?
    A combination of sediment dating, location of marine fossils and sedimentary structures.
  8. the O18 : O16 can be used to?
    to estimate extent of polar ice and sea-level
  9. During glacial periods snow fall is stored in ice caps so
    polar ice becomes enriched in O16... and ocean is depleted of O16.
  10. How can ocean circulation impact sea-leve?
    cold dense water formed near the poles, sinks and spreads along the bottom of the ocean.
  11. 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
  12. Percolation increases with increasing grain size, so beaches with courser sediments tend to be ______.
  13. The Bruun Rule
    The equilibrium between offshore sand and on. Erosional sediment is deposited toward the ocean slope.
  14. How do Barrier islands migrate?
    Rising sea-level pushed barrier islands toward land because of overwash mainly during storms.
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Oceanography slides 4+5
2012-01-26 14:22:16

oeas 4+5
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