All these statements accurately describe the “diurnal” (daily) behavior of the atmosphere. Just as the moon causes ocean tides, solar heating causes “barometric tides”—regular rises and falls in pressure. These cycles are most intense in the tropics, weaken as you move toward the higher latitudes and essentially vanish beyond 60°, where polar weather systems dominate. ANSWER: (D) All of the above.
Which of the following statements is true? (A) The fluctuation of air pressure is called ‘barometric tide’. (B) The fluctuations in air pressure decrease from the equator towards the poles. (C) Daily fluctuations in air pressure are not observed after 60° latitude. (D) All of the above.
Share
Atmospheric pressure is not static; it pulses twice daily due to the sun’s heating of the air and the ozone layer. This rhythmic cycle is known as the barometric tide. The amplitude of this pulse is greatest at the equator, where solar energy is most consistent. As you move toward the poles, the thermal influence of the sun becomes less direct, causing these predictable daily fluctuations to diminish. By the time you reach 60° North or South, the chaotic pressure changes caused by moving storm systems and jet streams completely override the subtle barometric tides, making them unobservable.
Your dream of a government Staff Selection Commission job starts with Competitive Exam Preparation TA App. Get unlimited practice questions today.