The figure below shows the absorption coeffcient (equivalent of opacity %) of pu
ID: 3308626 • Letter: T
Question
The figure below shows the absorption coeffcient (equivalent of opacity %) of pure liquid water as a function of wavelength from Zender & Talamantes (2006, JQRST, 98, 122). [Note: the lowest y value should be o.o001 m/kg] H20 liquid 10.0000 E 1.0000 0.1000 0.0100 0.0010 0.0010 0.5 1.0 15 2.0 25 3.0 Wavelength à (m) (a) [5 pts] Based on the spectral properties of water absorption shown here, explain qualitatively why the clear ocean appears blue. (b) [10 pt] If we dive deep enough underwater, it becomes dark. At what point would we see no sunlight whatsoever?Assume the density of water is approximately constant at = 1 g/cm, and is brightest at o.51m. (c) [1o pt] Oceans, lakes and rivers are arely clear as silt and other material is in suspension in them. Assume a suspension of clay, which has a mass density of 4 /cm, with a volume fraction of 50 ppm (parts per million). If you can see your hand only 1 foot into the water, what is the (visible) absorption coefficient of clay?Explanation / Answer
a) For most of the world's oceans, the color is ofcourse blue. This is because pure water is perfectly clear, but if there is lot of water and water is very deep so that there are no reflections off the sea floor, the water is appears as a very dark navy blue. The reason the ocean is blue is due to the absorption (Referring to the spectral line in the diagram 0.5 micro meter) and scatteringof blue light. The blue wavelength of light are scattered similar to the scattering of blue light in the sky, but absorption is a much larger factor than scattering for the clear ocean water.The water absorption is strong in the red and weak in the blue , thus red light is absobed quickly in the ocean leaving blue. Almost all the sunlight that enters the ocean is absorbed except very close to the coast. the red, yellow and green wavelengths of sunlight are absorbed by water molecules in the ocean . when sunlight hits the ocean, some of the light is reflected backdirectly but, most of it penetrates deep in to the ocean surface and interacts with water molecules that it encounters. The red, orange, yellow and green wavelengths of light absorbed so that the remaining light we see is composed of the shorter wavelength blue and violet.
b) if we dive deep into underwater, approximately 100 feet the water appears dark
c) the visible absorption coefficient of clay is ranging from 0.15 to 0.2.
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