CLIMATE OF INDIA
EL NINO AND SOUTHERN OSCILLATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Occur every 3-5 weeks/ Usually last for 9-12 days.
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Occur every 3-5 years/ Usually last for 9-12 months.
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Occur every 9-12 years/ Usually last for 3-5 months.
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Occur every hour/ Usually last for 15 min.
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Detailed explanation-1: -El Niño and La Niña are opposite phases of a natural climate pattern across the tropical Pacific Ocean that swings back and forth every 3-7 years on average.
Detailed explanation-2: -El Niños typically occur every 3 to 5 years. How do El Niño and La Niña events form and increase in strength? The key is in the ocean-atmosphere coupling across the tropical Pacific Ocean.
Detailed explanation-3: -El Niño events occur irregularly at intervals of 2-7 years, although the average is about once every 3-4 years. They typically last 12-18 months, and are accompanied by swings in the Southern Oscillation (SO), an interannual see-saw in tropical sea level pressure between the eastern and western hemispheres.
Detailed explanation-4: -El-Nino is a warm ocean current that sometimes appears off the coast of Peru in South America during the month of December. It increases the surface temperature of the sea and affects the movement of monsoon winds in the Indian Ocean and causes a drought-like situation in the Indian sub-continent.