Presentation on theme: "By Jessica Tancordo. Geography covers 360 million km 2 3 major ocean basins Pacific-180 million km 2 Atlantic-106 million km 2 Indian-75 million."— Presentation transcript:
Temperature Sunlight absorbed Kinetic state Temperature Thermal stratification - layering of water by temperature which is a permanent feature of tropical oceans Thermocline - a layer of water in which temperature changes rapidly with depth Lowest average temp: -1.5 0 C Highest average temp: 27 0 C Temperate zone at 40 0 Latitude- greatest stability at 100 m deep
Current What does it transport?What does it do? nutrients oxygen heat organisms Gyres – circulation systems move to right of N. Hemis and left of S. Hemis Upwelling – wind blows surface water offshore allowing colder water to rise to surface Moderate climates fertilizes the surface waters off continents stimulate photosynthesis promote gene flow through populations
Chemical Conditions Salinity varies with latitude among seas. Lowest salinities – near equator and above 40 0 N latitudes- precipitation high & evaporation low Highest salinities – subtropics- precipitation low and evaporation high Varies in small enclosed basins Baltic and Red Sea Oxygen increases at surface and decreases with depth
Biology Phytoplankton – microscopic photosynthetic organisms that drift with current Zooplankton – small animals that drift with current Ranges from brightly colored organisms in epipelagic zone to bioluminescent organisms in the abyssalpelagic zone Nourished by organic matter provided by photosynthesis at surface.
Biology continued The deep ocean refered to as “Biological Desert” ¼ total photosynthesis in biosphere Provides substantial amount of global carbon and oxygen. Little that can be harvested economically for direct human consumptions in the open ocean.
Human influences Whale populations Harvesting krill Dumping of wastes Strandings Organisms swallowing and getting caught in trash Decrease in global carbon and oxygen Overfishing affects other populations of others.
Why does the Baltic sea have low salinity? A) It receives freshwater from temperate and boreal biomes B) it has high precipitation C) it has low evaporation D) all of the above
What is Thermocline? A) a layer of water in which temperature changes rapidly with depth B) layering of water by temperature which is a permanent feature of tropical oceans. C) when your thermostat is at your fathers desired temperature. D) none of the above