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assign3_solutions

assign3_solutions - Introduction to Atmospheric...

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Introduction to Atmospheric Sciences (ATOC-210) Assignment # 3, due date March 5/09 1) State the three major types of clouds based on their altitude and appearance? What are their composition and temperature? At what altitudes do they form? High Clouds (Cirrus, Cirrostratus, and Cicrrocumulus): 7-8 km from surface, T below -25C, mainly composed of ice crystals. Middle clouds (Altostratus, altocumulus): 2-7 km from the ground, T between -25 and 0C, and are composed of supercooled water droplets or a mixture of supercooled water droplets and ice crystals. Low clouds (stratocumulus, stratus and nimbostratus): 0-4 (upper limit) from surface, T above -5C, mostly composed of water droplets. 2) What causes the colors of a rainbow? Also, distinguish between a primary and secondary rainbow? Refraction of light is wavelength-dependent so that refraction of visible light by falling raindrops disperses light into its component colors. A primary rainbow is caused by a single internal reflection in raindrops. A secondary rainbow is caused by a double
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