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Lecture 23 - Ocean Circulation

Lecture 23 - Ocean Circulation - Lecture 23 Ocean...

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Lecture 23 Ocean Circulation
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Ocean Productivity Related to primary productivity The amount of carbon fixed by organisms through the synthesis of organic matter Sources of energy Photosynthesis (solar radiation) Chemosynthesis (chemical reactions) Influenced by Availability of nutrients Amount of solar radiation
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Ocean Productivity Nutrients Good sunlight Productivity in polar oceans Because of nutrients rising from deeper water, high-latitude surface waters have high nutrient concentrations Most abundant marine life exists where there is ample
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Ocean Productivity Productivity in polar oceans Low solar energy limits photosynthetic productivity Productivity in tropical oceans Low in the open ocean Thermocline eliminates the supply of nutrients from deeper waters below
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An Example of Productivity in Polar Oceans (Barents Sea)
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Productivity in Tropical Oceans
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Ocean Productivity Productivity in temperate oceans Winter Low productivity Days are short and sun angle is low Spring Spring bloom of phytoplankton is quickly depleted Productivity is limited
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Ocean Productivity Productivity in temperate oceans Summer Strong thermocline develops so surface nutrients are not replaced from below Phytoplankton population remains relatively low Fall Thermocline breaks down and nutrients return to the surface Short-lived fall bloom of phytoplankton Highest overall productivity occurs in temperate regions
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Productivity in Temperate Oceans
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Oceanic Feeding Relationships Main oceanic producers Marine algae Plants Bacteria Bacteria-like archaea Only a small percentage of the energy taken in at any level is passed on to the next
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Oceanic Feeding Relationships Trophic levels Chemical energy stored in the mass of the
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