Q. With reference to Atlantic Niño, consider the statements below:
1. It causes a reduction in the number of low-pressure systems leading to a deficit-monsoon.
2. The biggest rainfall deficits from the Atlantic Niño tend to occur over the Eastern Ghats.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: A
Notes:
  • Statement 1 is correct: Atlantic Niño’s impact on the monsoon has been known since 2014 when a study led by INCOIS showed that the number of low-pressure systems is greatly reduced by the Atlantic Niño, leading to deficit monsoons. 
  • Statement 2 is incorrect: The Atlantic Niño affects the monsoon by producing atmospheric waves, which propagate into the Indian Ocean. These waves affect air temperatures over the Indian Ocean and influence the land-ocean thermal contrast as well as Low Pressure Systems (LPSs). The biggest rainfall deficits from the Atlantic Niño tend to occur over the Western Ghats and the core monsoon zone. 

Source: Article