Which statement is not correct about EI Nino?

The correct answer is During El Nino, there is no wind shift in the equatorial Pacific Ocean.

Concept:

• El Nino is a climatic phenomenon characterized by the warming of sea surface temperatures in the central and eastern tropical Pacific Ocean.
• It has significant impacts on global weather patterns, including changes in precipitation, temperature, and atmospheric circulation.
• El Nino events typically occur every 2 to 7 years and can last from several months to a couple of years.

Explanation:

• It primarily affects the rainfall pattern off the west coast of South America: This is correct. El Nino causes a shift in rainfall patterns, often leading to heavy rains and flooding in coastal South America and drought conditions in the western Pacific region.
• During El Nino, there is no wind shift in the equatorial Pacific Ocean: This is incorrect. During El Nino, the normal trade winds (east to west) weaken or even reverse direction, which is a significant shift in wind patterns.
• The normal east to west winds reverse direction and drag the large volume of water eastwards in the Pacific Ocean: This is correct. The weakening or reversal of trade winds allows warm water to move eastward across the Pacific, impacting weather patterns globally.
• The normally cold water becomes warmer and the growth of microscopic algae is inhibited: This is correct. The warming of sea surface temperatures disrupts the nutrient upwelling process, which inhibits the growth of algae and affects the entire marine food chain.