Which one of the following places of India experiences highest atmosph

Which one of the following places of India experiences highest atmospheric pressure during winter?

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Jaisalmer

Leh

Chennai

Guwahati

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This question was previously asked in

UPSC CDS-1 – 2018

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Atmospheric pressure is influenced by temperature, altitude, and dynamic weather systems. During winter, strong high-pressure systems develop over the cold continental landmasses, including central Asia and extending into northwest India. While Leh (Ladakh) experiences extreme cold, its very high altitude leads to significantly lower atmospheric pressure compared to locations at lower altitudes. Jaisalmer (Rajasthan) is located in northwest India, which is under the influence of the winter high-pressure system, but at a much lower altitude (~225m) than Leh (~3500m). Chennai and Guwahati are in warmer regions and not under the core influence of the continental winter high. Therefore, among the given options, Jaisalmer is most likely to experience the highest atmospheric pressure during winter due to its location within the winter high-pressure belt at a relatively low altitude compared to Leh.

Winter high pressure systems lead to cold, dense air over landmasses. While cold increases density and thus pressure, altitude significantly reduces pressure. Jaisalmer is located in the region influenced by the winter high at a much lower altitude than Leh.

Actual atmospheric pressure decreases with increasing altitude. A rough estimate is a decrease of about 1 hPa for every 8 meters increase in altitude at lower levels. While Leh’s extreme cold contributes to higher air density, the vast difference in altitude between Leh and Jaisalmer means Jaisalmer’s actual surface pressure will typically be much higher.

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