Why do northern and southern Africa appear much darker in Figure 25-4b than in 2
ID: 236024 • Letter: W
Question
Why do northern and southern Africa appear much darker in Figure 25-4b than in 25-4a? (a) Has the ocean around the continent changed temperature during the time between the first and second image? (b) Why? (a) Which feature of the general circulation of the atmosphere explains the band of clouds near the equator? (b) Why are these clouds much more obvious in Figure 25-4b than in Figure 25-4a? Scan the QR (Quick Response) code for this exercise, or go to the Hess Physical Geography Laboratory Manual, 11th edition, Web site at www.mygeoscienceplace.com, to view Figure 25-5 and Figure 25-6, two infrared satellite image movie loops. Problems 1 and 2 are based on Figure 25-5: "West Coast Infrared Satellite Movie Loop." (a) Is high or low pressure found northeast of Hawai (30 degree N, 140 degree W)? (b) How can you tell? (a) Is high or low pressure found west of California (35 degree N, 125 degree W)? (b) How can you tell? Problems 3 and 4 are based on Figure 25-6: "Africa 4-Day Infrared Satellite Movie Loop." When explains the general direction of movement of clouds in the region of the Mediterranean Sea and western Eurasia? What explains the growth of clouds just south of the equator as the movie loop proceeds?Explanation / Answer
Excersise 25 part II
1. Warm places are appeared as dark clours in infrared images as well as cold palce are appeared as light. So the image 25-4b represents the warm temperature condition so Affrica in this image is appeared as dark and this image may be taken during day time in the presence of sun light. But the image 25-4a represents cold temparature so this was taken during night time.
2. a. the temperature of ocean as in the both images is not changed.
b. Here the colour of ocean is same in the both images. Beasuse the ocean at equator maintains the same temparature at any time. But if any temparature changes may be present in the images the colours of the certain features may changed in infrared images.
3.a. The trade winds(Hadley cells)
b. As air is heated at the equator, it rises in the troposphere up to 10 miles. In the wake of the warm rising air, low pressure develops at the equator. When the air reaches the top of the troposphere, it can rise no farther and begins to move toward the poles, cooling in the process. So the clouds in the images are appeared as white represents cold temparature.
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