Presentation on theme: "Composition and Movement of Ocean Water. Salinity Seawater is a solution containing a variety of salts dissolved in water Expressed in grams of salt per."— Presentation transcript:
Salinity Seawater is a solution containing a variety of salts dissolved in water Expressed in grams of salt per kilogram of water
Physical Properties of Sea Water Density(1.02g/ml – 1.03 g/ml) –What would increasing the amount of salt in the water do to the density? –Increasing the amount of salts, increases the density –What would happen to the density of the water if the temperature of the water increases? –Increasing the temperature decreases the density
Can you notice any pattern to the direction of the winds above and below the equator in each ocean basin?
Warm ocean currents such as the Gulf Stream Current in the North Atlantic, are important to global climate Warm ocean currents generally flow away from the Equator
Beginning in the Caribbean and ending in the northern North Atlantic, the Gulf Stream Current is one of the world's most intensely studied current systems. This extensive western boundary current plays an important role in the pole-ward transfer of heat and salt and serves to warm the European coastal regions. Gulf Stream Current
Density Currents Aim: How does water not affected by surface winds circulate throughout the ocean basins?
An underwater current circles the globe with a force 16 times as strong as all the world's rivers combined This deep-water current is known as the global conveyor belt and is driven by density differences in the water. Water movements driven by differences in density are also known as thermohaline circulation
Density Currents Deep water circulation caused by differences in the densities of ocean water What might cause density differences in the ocean waters? –Temperature –Salinity
As a result of temperature: Dense cold water from Polar regions sinks and slides along the ocean floor toward Equatorial regions. The less dense water in the warmer regions are displaced
As a result of salinity changes: The Gibraltar Current Mediterranean Sea –Evaporation of sea water near the surface causes the surface water to have a higher salinity and therefore it becomes more dense –This water sinks and flows out of the sea and into the Atlantic Ocean –It is then replaced by water from the ocean.