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Unformatted text preview: Ocean Atmosphere last Class 19:04 Theoretical Sea Level : The average height of the surface of the ocean above the seafloor defines sea level. In reality, waves, tides, storms, pressure gradients, and other oceanographic and meteorological factors will alter the sea level The theoretical surface of the ocean in the absence of an disturbing force is defined by the Earths geoid , the equipotential surface of Earths gravitational field. The geoid varies according to the masses of Earths crustal features; mountains aboveground and underwater generate a stronger gravitational field than a flatland. The geoid defines surfaces that are perpendicular to the gravitational field. Mass difference in Earths crust generate different gravitational forces Geoid-theoretical mean sea level Practical Sea Level : to keep tack of differences in sea level at a single location and to be able to...
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This note was uploaded on 08/26/2011 for the course GEOGRAPHY 3A taught by Professor Staff during the Spring '11 term at UCSB.
- Spring '11