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Consider the following statements with reference to Jet Streams:
- Jet streams blow in a direction parallel to the pressure gradient force.
- They help in the maintenance of latitudinal heat balance.
Which of the statements given above is/are correct?
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements with reference to Jet Streams: Jet s...
Explanation:
Jet streams are high-altitude, narrow, fast-moving air currents that occur in the upper levels of the atmosphere. They flow in a wavy pattern from west to east, and their speed can range from 120-240 km/h.
Statement 1: Jet streams blow in a direction parallel to the pressure gradient force.
- The pressure gradient force is the force that drives air from high-pressure areas to low-pressure areas. In the case of jet streams, they blow in a direction parallel to the pressure gradient force.
- This statement is correct.
Statement 2: They help in the maintenance of latitudinal heat balance.
- Jet streams play an important role in the maintenance of the latitudinal heat balance of the Earth's atmosphere.
- They act as a barrier that separates cold polar air from warm tropical air, which helps to maintain the temperature gradient between the poles and the equator.
- This statement is also correct.
Therefore, both statements are correct, and the correct answer is option B (2 only).
Jet streams are high-altitude, narrow, fast-moving air currents that occur in the upper levels of the atmosphere. They flow in a wavy pattern from west to east, and their speed can range from 120-240 km/h.
Statement 1: Jet streams blow in a direction parallel to the pressure gradient force.
- The pressure gradient force is the force that drives air from high-pressure areas to low-pressure areas. In the case of jet streams, they blow in a direction parallel to the pressure gradient force.
- This statement is correct.
Statement 2: They help in the maintenance of latitudinal heat balance.
- Jet streams play an important role in the maintenance of the latitudinal heat balance of the Earth's atmosphere.
- They act as a barrier that separates cold polar air from warm tropical air, which helps to maintain the temperature gradient between the poles and the equator.
- This statement is also correct.
Therefore, both statements are correct, and the correct answer is option B (2 only).
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Consider the following statements with reference to Jet Streams: Jet s...
Jet streams are concentrated narrow bands of fast flowing and strong winds in the upper troposphere of the earth that significantly affect global weather phenomena. There are three types of jet streams:
- Polar jet stream – between Ferrel and Polar cells
- Sub-Tropical jet stream – between Hadley and Ferrel cells
- Temporary jet streams – e.g.- Somali Jet Stream, Tropical Easterly Jet Stream
- Properties- Geostrophic winds – due to Coriolis force, they blow in a direction perpendicular to the pressure gradient force. Hence statement 1 is not correct.
- Circumpolar – circle around the earth with poles as their centres
- Westerlies – i.e. blow in west to east direction
- Rossby waves because of meandering path
- High velocity – 150-250 kmph
- Upper atmospheric wind circulation – blow just below the tropopause
- Role of Jet Streams in Weather Phenomenon - Help in maintenance of latitudinal heat balance by mass exchange of air. Hence statement 2 is correct.
- Influence the weather of mid-latitudes by influencing the path of temperate cyclones and the distribution of precipitation.
- Impact the movement of air masses, which may cause prolonged drought or flood conditions. Eg. polar vortex cold wave over North America in 2014 winters.
- Role of Jet Streams in Rainfall in India-
- Sub-tropical jet stream and some temporary jet streams together influence Indian Monsoon patterns, winter rainfall and tropical cyclones.
- Winter rainfall: The Sub-Tropical westerly jet stream transports the western disturbances (temperate cyclones) originating over the Mediterranean Sea and brings rain to northwestern regions of India – Punjab, Haryana, Himachal Pradesh.
- Southwest monsoon: The sub-tropical jet stream and easterly jet stream play an important role in the monsoon system of India.
- The withdrawal of sub-tropical jet stream from the south of Himalayas paves the way for the onset of monsoon in Indian sub-continent.
- The easterly jet stream steers the tropical depressions into India, which play a significant role in the distribution of rainfall during the SW monsoon period.
- Tropical cyclones – The Easterly jet stream steers tropical depressions and cyclones from the Pacific ocean towards Indian Ocean region causing rainfall predominantly over the eastern coastal region. Eg. cyclone Mora in 2017.
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Consider the following statements with reference to Jet Streams: Jet streams blow in a direction parallel to the pressure gradient force. They help in the maintenance of latitudinal heat balance.Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'B'. Can you explain this answer?
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