Q. Consider the following:

1. The Walker Circulation is a large-scale east–west atmospheric circulation found in the tropical Pacific region.
2. It is closely linked to El Niño and La Niña phenomena, impacting rainfall patterns across the Pacific Ocean.
3. The weakening of the Walker Circulation is typically associated with El Niño events, leading to reduced rainfall in the western Pacific and increased rainfall in the central and eastern Pacific.
4. The Walker Circulation operates predominantly in polar regions and is not significant in the tropics.

Which of the above statements is / are correct?
Answer: 1, 2 and 3
Notes: Statements 1, 2, and 3 are correct: the Walker Circulation is an east–west atmospheric circulation in the tropical Pacific linked to ENSO events, impacting rainfall distribution. Its weakening during El Niño causes less rainfall in the west and more in the eastern and central Pacific. Statement 4 is incorrect; the Walker Circulation does not operate in polar regions.