Discussion
Which sign of thermal wind does the summer polar stratosphere have?
Answer: B
Continuous sunlight warms the summer polar stratosphere above the tropical value, reversing the temperature gradient and producing an easterly thermal wind. The result is the summer stratospheric easterlies, which prevent vertical propagation of planetary waves and so make the summer stratosphere quiescent. The winter hemisphere has the opposite arrangement with a strong westerly polar vortex.
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