Print Friendly, PDF & Email

Why has the Northeast monsoon remained subdued this year?

GS Paper 1:

Topics Covered: Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc.

 

Context:

Faced with the fourth consecutive year of flooding and landslips since 2018, two months of the northeast monsoon alone has caused massive losses in terms of damage to life, property, and crops.

  • The overall estimated damage caused by the rain in October and November alone has been pegged at ₹11,916.3 crore and as per the State Disaster Response Fund (SDRF) norms, ₹1,281.92 crore.

 

What is the Northeast monsoon?

  • Occurs during October to December, and is a small-scale monsoon compared to South- West Monsoon.
  • It is confined to the Southern peninsula.
  • The rainfall associated with the Northeast monsoon is important for Tamil Nadu, Puducherry, Karaikal, Yanam, coastal Andhra Pradesh, Kerala, north interior Karnataka, Mahe and Lakshadweep.
  • Some South Asian countries such as Maldives, Sri Lanka and Myanmar, too, record rainfall during October to December.

 

How is La Niña linked with the Northeast monsoon?

While La Niña conditions enhance the rainfall associated with the Southwest monsoon, it has a negative impact on rainfall associated with the Northeast monsoon.

During La Niña years, the synoptic systems — low pressure or cyclones — formed in the Bay of Bengal remain significantly to the north of their normal position.

  • Besides, instead of moving westwards, these systems recurve. As they lie to the north of their normal position, not much rainfall occurs over southern regions like Tamil Nadu.

current affairs

 

InstaLinks:

Prelims Link:

  1. What is El Nino?
  2. What is La Nina?
  3. What is ENSO?
  4. When do these events occur?
  5. Impact of ENSO on Asia, Africa and Australia.

Mains Link:

Discuss the impact of La Nina weather phenomenon on India.

Sources: the Hindu.