Color of light that penetrates seawater











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Therefore, water near the seashore that is more turbid cloudy due to particles will show a decrease in light transmission, even in shallow water. The a-c meter has separate sensors to detect absorption of light by particles and total light attenuation. The fact that they do not require zooxanthellas to survive does not mean one can't grow on it and produce only for it's own benefit. It functions in a manner like that of a transmissometer. The transmissometer measures light attenuation, or the sum of scattering and absorption of light in sea water.

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Greater abundances of solid particles in the water will decrease the depth of light penetration. Although the amount of light is measurable at this range of depths, there is not enough available for photosynthesis to take place. Water in shallow coastal areas tends to contain a greater amount of particles that scatter or absorb light wavelengths differently, which is why sea water close to shore may appear more green or brown in color. Brown Publishers, It generally extends to a depth of meters feet.

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The physics of sea water

Conversion of some of that energy into heat helps form the thin layer of warm water near the ocean's surface that supports the majority of marine life. The long wavelengths of the light spectrum—red, yellow, and orange—can penetrate to approximately 15, 30, and 50 meters 49, 98, and feet , respectively, while the short wavelengths of the light spectrum—violet, blue and green—can penetrate further, to the lower limits of the euphotic zone. Scientists have developed several different methods and instruments to measure light transmission in water. Similarly, light transmission is a key factor in the ecology of lakes and streams, which are discussed elsewhere in this encyclopedia. Most of the visible light spectrum is absorbed within 10 meters 33 feet of the water's surface, and almost none penetrates below meters feet of water depth, even when the water is very clear. Upper Saddle River, NJ.

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Description: A detector on the instrument measures the amount of light that is scattered back into it. The depth at which the disk is lost to sight is noted using the rope markings. Below this is the disphotic zone, between and 1, meters and 3, feet deep, which is dimly lit. The simplest measurement method involves the use of the Secchi disk, a white plate about 30 centimeters 12 inches in diameter. Similarly, light transmission is a key factor in the ecology of lakes and streams, which are discussed elsewhere in this encyclopedia. If it is calm and smooth, less light will be reflected.
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