Chapter_6_-_Part_2

Chapter_6_-_Part_2 - Deep-Ocean Circulation Deep-ocean...

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Deep-Ocean Circulation Deep-ocean circulation is powered by density differences between water masses. It is also called the thermohaline circulation. Temperature = thermal Salinity = haline This instrument measures salinity This instrument measures salinity and temperature. and temperature.
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The density of water masses is determined primarily by temperature and salinity. The processes that affect density occur near the sea surface. Temperature: –Heating and cooling Salinity: –Evaporation –Precipitation –Ice formation –Runoff, river drainage
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Water Masses When water sinks, it is isolated from the processes that affect density. Therefore, water masses retain the temperature and salinity signature established when they were at the sea surface.
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Water masses Most ocean water is cold and moderately salty.
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Thermohaline circulation in the Atlantic
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In the north Atlantic, a sill prevents the coldest, heaviest water from flowing into the interior.
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Chapter_6_-_Part_2 - Deep-Ocean Circulation Deep-ocean...

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