The following questions are based on Figure 25-1, a visible light of the norther
ID: 236025 • Letter: T
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The following questions are based on Figure 25-1, a visible light of the northern Pacific Ocean and the west coast of North America, and Figure 25-2, an infrared image of the same region taken on the same day and time. A well developed mid-latitude cyclone is in northern Pacific Ocean 1, (a) Are the clouds along the cold front of the mid-latitude cyclone (at about 45 degree N, 140 degree W) high clouds or low clouds? (b) How can you tell? 2.In the infrared image (Figure 25-2) why does south-central Mexico (20 degree N, 100 degree W) appear black? The following questions are based on Figure 25-3 showing visible light, infrared and water vapour images of western North America and the northern Pacific Ocean taken on the same day and time.3 (a) In the visible image, notice the c along the coast of California and Haja, Mexico. Are these high clouds or low clouds (b) How can you tell? 4. (a) In visible light image, find the cloudless area of the coast of Orlando and Washington. Does this region contain relatively large amounts of water vapour, or relatively little water vapour?Explanation / Answer
3. These are low clouds.
a. Because infrared imageries are temparature based. So the temparature near the earth surface is in warm . The warmest emissions are displayed as dark greys on an infrared satellite image, while cold emissions are displayed as bright white.Low clouds are about the same temperature as the ground so that it belongs to low clouds.
4. Contains low amount of water vapor.
Beasuse in cloud less areas the effect of albedo is high dueto sun transmits its light through the atmosphere in the absence of clouds and finally reaches the surface. Here the reflectance of light is very high.
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