MARS 1010 Surface Ocean Circulation

MARS 1010 Surface Ocean Circulation - o When you add up the...

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MARS 1010:  Surface Ocean Circulation 07/09/2007 10:07:00 Surface Ocean Circulation It’s all about heat transport through currents driven by the winds. Surface ocean circulation (wind driven) only includes the top 100 to 150  meters.   Steps: o Wind blows across the water and drags on its surface o Friction acts as resistance.  (Ex.  If wind blows 10 m/s, the current will  equal approx. 1 m/s)  o Because of the Coriolis effect, wind driven currents actually flow at a  45˚ discrepancy to the right in the northern hemisphere.   The Ekman Spiral:  The top layer of water acts on the water below just as the  wind does on the layer above.  The Coriolis effect still applies and it creates a  sort of spiral with each layer below, moving a little bit to the right, each time.  
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Unformatted text preview: o When you add up the averages of the directions from each direction it comes out to a “net transport” of 90˚ offset to the right for all the water in the column. • Gravity + Coriolis results in something called the Geostrophic flow. o Gravity pushes out as the Coriolis effect pushes water in. This results in a circular flow of water. These result in Subtropical Gyres. • Western Intensification: o Western Boundary currents are narrower, stronger, faster, deeper, and warmer than eastern currents. o Eastern Boundary currents are wider, weaker, slower, shallower, and colder than western currents ← A layered Ocean: •...
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