Chapter 8 Notes

Chapter 8 Notes - Chapter 8 Ocean Circulation 10:40:00 AM...

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Chapter 8 – Ocean Circulation 18/03/2008 09:40:00 Definitions Surface currents—water flowing horizontally in the uppermost 400 m of the  ocean’s surface Thermohaline circulation—circulation due to density differences, where are  largely a function of temperature and salinity Gyre—the flow around the periphery of an ocean basin Ekman spiral—the process of subsequent layers of water moving at an angle  to the right of the overlying water (in the Northern hemisphere; in the  Southern hemisphere, the process is reversed) Ekman transport—the net motion of water down to about 100 m, after  allowance for the summed effects of the Ekman spiral o Theoretically at 90 o  to the right of wind direction in the Northern  hemisphere and 90 o  to the left in the Southern hemisphere Geostrophic gyre—gyres in balance between the pressure gradient and the  Coriolis effect o Geostrophic currents—currents associated with geostrophic gyres Antarctic circumpolar current—also called the West Wind Drift, the largest  current, flowing endlessly eastward around Antarctica, driven by powerful,  nearly ceaseless westerly winds and never deflected by a continent Western boundary current—the fastest and deepest geostrophic currents 
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