Which one of the following is not a resultant of the El Nino effect?

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Distortion of equatorial atmospheric circulation.

Flow of the South-East Trade Winds towards the Indian Ocean.

Irregularities in the evaporation of sea water.

Reduction in the amount of planktons which reduces the number of fish in the sea.

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Answer is Wrong!

This question was previously asked in

UPSC CDS-1 – 2022

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El Nino is characterized by the warming of surface waters in the eastern tropical Pacific Ocean and a weakening or reversal of the trade winds in that region. This disrupts normal atmospheric circulation patterns, including the Walker Circulation. Option B states that it results in the flow of South-East Trade Winds towards the Indian Ocean, which is not a direct or characteristic result of the El Nino effect on the primary trade winds in the Pacific. While El Nino impacts global weather patterns and teleconnections can affect the Indian Ocean region and monsoon, the core effect on trade winds is their weakening in the Pacific, not a redirected flow towards the Indian Ocean.

El Nino’s primary impact is on the Pacific Ocean’s oceanographic and atmospheric conditions, specifically the weakening/reversal of trade winds and warming of the eastern Pacific, leading to a distortion of the Walker Circulation.

Option A describes the distortion of equatorial atmospheric circulation (weakening of the Walker Circulation), which is a fundamental consequence of El Nino. Option C refers to irregularities in evaporation, which naturally occur with significant changes in sea surface temperatures. Option D describes the reduction in plankton and fish due to suppressed upwelling of nutrient-rich cold water off the coast of South America, a well-known ecological impact of El Nino. Therefore, B is the statement that does not accurately describe a resultant of the El Nino effect.

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