Which one among the following statements is NOT correct regarding the La Niña event of the global climate system?

It refers to abnormal warming of sea surface water in central and eastern tropical Pacific Ocean

The correct answer is Option (4) → It refers to abnormal warming of sea surface water in central and eastern tropical Pacific Ocean

Let’s analyze the statements about La Niña carefully:

1. It causes drought in Peru and Ecuador and heavy floods in Australia → True. La Niña strengthens the trade winds, pushing warm water westwards, causing heavy rainfall in Australia and drought in Peru/Ecuador.
2. It is beneficial for the Indian monsoon and aids rainfall across India → True. La Niña usually enhances the southwest monsoon.
3. It refers to abnormal cooling of sea surface water in central and eastern tropical Pacific Ocean → True. This is the definition of La Niña.
4. It refers to abnormal warming of sea surface water in central and eastern tropical Pacific Ocean → False. This describes El Niño, not La Niña.