Ocean Layers. Based on sunlight penetration: Based on water density: Sunlight (photosynthesis is possible) Twilight Midnight
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1 PART 3
2 Ocean Layers Based on sunlight penetration: Sunlight (photosynthesis is possible) Twilight Midnight Based on water density: Mixed layer Pycnocline (rapid change of themperature/salinity) Deep ocean (cold and salty)
3 Processes at the Ocean Surface: 1. Water heating by the Sun, temperature 2. Water evaporation (salt is left behind), salinity 3. Precipitation (fresh water input), salinity 4. Water cooling (cold winds/ice masses), temperature 5. Ice melt (fresh water is released), salinity 6. Ice formation (salt is left behind), salinity 7. Large river inflow (fresh water is released), salinity 8. Water movement (pushed by winds/tides) Processes in the Deep: 9. Water rise and fall (density difference) 10. Deep water downhill flow at the ocean bottom Interplay of these processes defines ocean circulation.
4 Ocean Circulation Water in the ocean is in constant motion. An ocean current is the movement of seawater in a certain direction (like a river in the ocean): surface currents wind driven vertical (upwelling/downwelling) currents thermohaline circulation currents Ocean circulation is the combined effect of all currents that move in oceans. NASA Perpetual Ocean v=xusdwpuwaou Visualization of global ocean surface currents
5 Surface Currents Wind driven (caused by friction between water and moving air). Horizontal currents, occur at the surface. Push the top 400 m of water. Form large circular patterns called gyres due to Coriolis effect (clockwise in Northern Hemisphere counterclockwise in Southern Hemisphere) N S Coriolis effect
6 Gulf Stream The Gulf Stream is a strong, fast moving, warm ocean current that originates in the Gulf of Mexico and flows into the Atlantic Ocean at a speed of about 1-5 mph. It transports nearly 4 billion cubic feet of water per second, an amount greater than that carried by all of the world's rivers combined. First discovered in 1513 by the Spanish explorer Juan Ponce de Leon and was then used extensively by Spanish ships as they travelled from the Caribbean to Spain. The Gulf Stream, Winslow Homer, 1899 In 1786, Benjamin Franklin mapped the current, further increasing its usage. 100 km wide 800 to 1,200 m deep
7 Wind Driven Upwelling/Downwelling Coastal (Ex: West Coast, Southern Hemisphere) Upwelling Downwelling Vertical currents: coastal and equatorial. Wind blows, pushes water away (note water is deflected due to Coriolis effect), causes deep cold water to rise up to replace it. Upwelling brings nutrients to surface: sites of rich fisheries. wind Equatorial S N Equator
8 Thermohaline Circulation Water masses rise and fall because of density differences due to variation of temperature and salinity with depth: vertical currents form. Shallow northern seas salinity = density, therefore water masses sink temperature = density therefore water masses float Thermohaline currents mix the ocean s waters on a global scale.
9 Deep currents are directed by ocean bottom relief: water masses move down the hill. Originate from polar regions. Cold and saline. More massive and move slower than surface currents. Example: Deep Currents
10 North Atlantic Ocean Basin Profile Bathymetry: measurement of ocean depths and floor profiles; done using echo sounders and satellite radar.
11 Overturning Circulation Deep water forms in polar regions: in Antarctic when the extremely frigid salty surface water sinks rapidly, and in North Atlantic due to evaporative cooling in Nordic seas. Upward flow overturning occurs in the Pacific and Indian Oceans mainly as a result of equatorial upwelling followed by heating.
12 Conveyor Belt Circulation Vertical currents combined with surface currents result in global conveyor belt movement of water. It takes several hundred years for the conveyor belt to turn over the ocean s waters and make one complete trip around the Earth. The ocean plays a major role in the distribution of the Earth s heat through deep sea circulation.
13 Conveyer Belt 3D Antarctic Bottom Water - the densest and coldest water in the free ocean.
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