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20 Cards in this Set
- Front
- Back
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Photic Zone
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Zone in which light penetrates the ocean, typically 100 to 600 meters deep
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Aphotic Zone
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Zone in which light does not penetrate the ocean, typically starts from 100 to 600 meters deep
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Euphotic Zone
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Upper layer of photic zone where energy fixed in photosynthesis exceeds energy lost in respiration
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Disphotic Zone
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Lower layer of photic zone where energy lost to respiration exceeds energy fixed through photosynthesis
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Compensation Depth
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The depth at which energy gained through photosynthesis equals energy lost to respiration
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Epipelagic Zone
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0-200 meters,
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Mesopelagic Zone
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200-1000 meters
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Bathypelagic Zone
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1000-4000 meters
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Abyssopelagic Zone
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4000 to 6000 meters
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Hadalpelagic Zone
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6000~ meters (the deepest point is around 11000 meters)
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Pycnocline
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A layer (usually from 500 to 1000 meters) where the density gradient is greatest in a body of water. Impedes mixing between upper and lower layers.
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Mixed Layer
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Ocean zone based on density, accounts for water between the surface and the pycnocline. Well mixed and nearly uniform.
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Thermocline
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A pycnocline where the difference in density is caused by a difference in temperature between the mixed layer and the deep layer.
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Halocline
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A pycnocline where the difference in density is caused by a difference in salinity between the mixed layer and the deep layer.
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Deep Layer
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Layer beneath the pycnocline, water moves/mixes slowly except at the bottom.
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Lysocline
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Depth at which the dissolution of calcite increases dramatically. Occurs from 4000m to 5000m in Pacific, 5000m to 6000m in Atlantic, and at greater depths in warmer waters.
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Littoral Zone
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Part of the ocean that is close to shore.
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Supralittoral Zone
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Area above the spring high tide line, is splashed by, but not submerged in water
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Eulittoral Zone
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Intertidal zone, extends from spring high tide line to the neap low tide line
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Neritic Zone
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Extends from the neap low tide line to the continental shelf, also called sublittoral
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