Geography • World GeographyHard
With reference to global wind circulation and jet streams, consider the following assertions: Assertion (A): The polar front jet stream is a fast-flowing river of air located in the upper troposphere, driven by strong horizontal temperature gradients between cold polar air masses and warm tropical air masses. Reason (R): Rossby waves form large undulations in the jet stream path, steering surface mid-latitude low-pressure cyclones and anticyclones across continents. Which of the following is correct?
A. Both Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation of Assertion (A)
B. Both Assertion (A) and Reason (R) are correct but Reason (R) is not the correct explanation of Assertion (A)✓ Correct Answer
C. Assertion (A) is correct but Reason (R) is incorrect
D. Assertion (A) is incorrect but Reason (R) is correct
💡 Solution & Explanation
Both assertion and reason are factually correct statements regarding upper-tropospheric dynamics, though Rossby wave undulations represent the wavelike pattern assumed by the jet stream rather than the direct thermal wind generation mechanism itself. Upper-air meteorology utilizes jet stream tracking for aviation routing and weather forecasting. Temperature contrasts create the pressure gradient force that accelerates air parcels into jet cores.
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