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Triple-dip La Niña

 

Triple-dip La Niña

  • A La Niña generally represents the periodic cooling of sea-surface temperatures across the equatorial Pacific ocean. If this cooling continues for three consecutive northern hemipshere winters, it will be termed as a Triple-dip La Niña.
  • As per the India Meteorological Department (IMD), there have been only six instances of La Ninã lasting for more than two years since 1950.

 

Triple-dip La Niña: News

  • A “triple-dip” La Niña can be explained as a multiyear cooling of the surface temperature of the equatorial Pacific Ocean. This can cause droughts, fierce winds and heavy rainfall.
  • The World Meteorological Organization (WMO) stated that the current event will last until at least the end of the year 2022, becoming this century’s first “triple-dip “La Niña.
  • The current La Nina began in September 2020 and its cooling influence is temporarily slowing the rise in global temperatures. But it will not halt or reverse the long-term warming trend.

 

Triple-dip La Niña: Why Conditions Continued for Three Years?

  • Impact of Climate Change: The triple-dip La Niña may be a result of exacerbating ENSO due to global warming. ENSO itself may be affected by a warming atmosphere and oceans.

 

El Niño–Southern Oscillation (ENSO)

  • ENSO is an irregular periodic variation in winds and sea surface temperatures over the tropical eastern Pacific Ocean, affecting the climate of much of the tropics and subtropics.
  • The warming phase of the sea temperature is known as El Niño and the cooling phase as La Niña.

 

Triple-dip La Niña: Global Impacts

global impacts of this Triple-dip La Niña event
global impacts of this Triple-dip La Niña event

 

El Niño v/s La Niña

El Niño v/s La Niña
El Niño v/s La Niña

Basis of Comparison

El Niño

La Niña

Meaning El Niño means Little Boy, or Christ Child in Spanish. La Niña means Little Girl in Spanish.
Sea Surface

Temperature

It represents the periodic warming of sea-surface  temperatures across the east-central equatorial Pacific. It represents the periodic cooling of sea-surface temperatures across the east-central equatorial Pacific.
Pressure It is laden with high air surface pressure in the western Pacific. It contain low air surface pressure in the eastern Pacific
Formation During El Niño, trade winds weaken. Warm water is pushed back east, toward the west coast of the Americas, resulting in a weaker Walker cell. During La Niña , trade winds are even stronger than usual, pushing more warm water toward Asia, resulting in a stronger Walker cell.
Period of Occurence Typically occure every 3-5 years and lasts 9-12 months. Typically occur every 3-5 years and lasts 1-3 years.
Impacts
  • Droughts in eastern Australia
  • Flooding in western South America
  • Weak upwelling over the west coast of South America.
  • Excessive rainfall in the eastern Australia
  • Drought conditions prevail in the South America
  • Strong upwelling over the west coast of South America.
Impact on Indian Monsoon The monsoon is affected so heavily that 70% reduction of the rainfall is expected. The winds doesn’t carry the moisture towards Indian landmass dueing El Nino causing deficiency in rainfall. La Nina causes high temperatures over the Indian Ocean, off the Somalian coast and a comparatively better monsoon rains in India.

 

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