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Q45 (CDS-I/2017) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

Result
Your answer: —  Â·  Correct: D
Explanation

Jet streams are narrow, concentrated bands of high-velocity geostrophic winds located in the upper troposphere [4]. They typically follow a meandering wave path (Rossby waves) near the tropopause at altitudes ranging from 8 km to 15 km [4]. While they are generally continuous over long distances, especially in winter, their strength and position vary seasonally [1]. Statement 4 is incorrect because the polar front jet achieves its maximum force during the winter, not summer [1]. This is due to the increased temperature gradient between polar and temperate air masses during the winter months, which strengthens the jet and makes it more continuous [2]. In summer, the temperature contrast is lower, causing the jet to weaken, shift poleward, and meander more significantly [5].

Sources

  1. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 27: Jet streams > 27. Jet streams > p. 383
  2. [4] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 4: Climate of India > JET STREAM AND INDIAN MONSOON > p. 7
  3. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 27: Jet streams > Upper Tropospheric Westerlies > p. 385
  4. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 27: Jet streams > Polar Front Jet (PFJ) > p. 388
  5. [5] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 27: Jet streams > How Does Polar Vortex Slip? > p. 392
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SIMILAR QUESTIONS

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IAS · 2020 · Q9 Relevance score: 1.54

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CDS-I · 2006 · Q90 Relevance score: 1.36

Consider the following statements: 1. Sudden storms and strong winds are the characteristics of equatorial low pressure area. 2. Westerly jet streams are seen in northern hemisphere only. Which of the statements given above is/ are correct ?