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g104_class20_upwelling_&_boundary currents

g104_class20_upwelling_&_boundary currents -...

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Boundary Currents - combine knowledge of global winds and Ekman flow - surface transport can be determined from wind direction/velocity - surface transport alters ocean surface dynamic height - dynamic height differences => geostrophic flow in ocean - the existence of a coastline leads to upwelling or downwelling Geography 104 - “Physical Geography of the World’s Oceans”
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equatorward winds along a coastline lead to offshore Ekman transport mass conservation requires these waters replaced by cold, denser waters from below subsurface water brings nutrients to surface, thus enhancing biological production offshore Ekman transport creates sea level slope, thus equatorward geostrophic current Coastal Upwelling
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global atmospheric pressure and winds equatorward wind off California coast in summer (anti-cyclonic winds around atmospheric high pressure)
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Equatorward winds drive offshore Ekman transport
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offshore Ekman transport sets up sea level slope Upwelling must occur to replace water transported offshore
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sea level slope drives equatorward geostrophic current Coriolis pressure
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