5. True/False: Upper-level winds are westerly in both hemispheres. a. True b. Fa

Question

5. True/False: Upper-level winds are westerly in both hemispheres. a. True b. False 6. Using the three cell model, where should the Earth's deserts be located. a. At the equator b. At 30 deg N and 30 deg S c. At 60 deg N and 60 degS 7. Why does the location and strength of the jet stream change with the seasons? a. The location of the jet stream is dependent on ocean currents. b. The location of the jet stream is dependent on snow fall which changes with the seasons The location of the jet stream is dependent on strong temperature gradients whith change with the seasons. c.

Explanation / Answer

5. True (a)- Due to atmospheric circulation and currents, upper atmospheric winds in both the hemispheres are westerly in direction.

6. At 300 North and South (b)- Reason behind this is the Hadely cell effect. Higher in the atmosphere, the cold, dry air rises and moves away from the equator. At about 30 degree latitudes in both hemispheres (north and south), the air descends, it warms. As it warms, the air expands. Hence, condensation and precipitation are a rare phenomenon.

7. Answer is (C)- The jet stream is strongest during the winter, when the temperature difference is greatest between cold arctic air to the north and warm tropical air to the south. During the summer, when the temperature difference between the air masses is smaller, the winds of the jet stream are weaker.

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