Chapter4 - Chapter 4: Sea Level Changes Tectonic Causes...

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1 Chapter 4: Sea Level Changes Tectonic Causes Climatic Causes Isostasy Changes in Ocean Volume Current and Projected Sea Level Changes Tectonic Sea Level Change : Changing size and shape of container •Crustal movement along leading edge (active) coasts Eustatic (global) Tectonic Changes •Sea-floor spreading Seasonal Changes •Atm. Pressure •Temperature (thermal expansion) •10-30 cm fluctuations Climatic Changes : short/long term, cyclical/non-cyclical Water moves to the right of the wind in the northern hemisphere Volume of water displaced by the wind depends on 1. Wind Velocity 2. Duration 3. Fetch Wind direction ocean response Seasonal Changes •Temperature (thermal expansion) Non-seasonal Cyclic Changes •El Nino (southern oscillation) •3-7 years
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2 stronger than usual Subtropical High and a deeper than normal Icelandic Low. more and stronger winter storms warm and wet winters in Europe cold, dry winters Canada and Greenland East Coast mild and wet winter Long-Term Climate Effects •Eustatic or global changes in sea level
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Chapter4 - Chapter 4: Sea Level Changes Tectonic Causes...

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