Why in the News? A recent study has revealed that the unprecedented triple dip La-Niña had peculiar impact on air quality in peninsular as well as North India.
More on News:
- The recent triple-dip La Niña conditions (2020–2023) had widespread impacts on the ocean and climate across the globe.
- During the winter of 2022–23 that coincided with retreating phase of the triple dip La-Niña, India experienced a peculiar trend in Air Quality:
- Poor Air quality in peninsular India: The dominance of higher northerly wind in the transport level forces influx and relatively slower winds near the surface, trapping pollutants and notably increasing PM2.5 concentration.
- Improved Air quality in North India: Weaker western disturbances, and unique wind patterns with the absence of rain and clouds and faster ventilation led to a significant improvement in air quality in the North.
- Observations were contrary to trends seen in recent decades, where in winter northern parts of the country witness increased pollution levels.
About Triple dip La Niña:
- A triple-dip La Niña is a rare event that occurs when the La Niña effect lasts three years in a row.
- La Niña is a phase of the El Niño Southern Oscillation (ENSO).
About El Niño Southern Oscillation (ENSO):
La Niña: A cooling of the ocean surface with below-average sea surface temperatures (SST), in the central and eastern tropical Pacific Ocean.
El Niño: It is the reverse of La Niña. A warming of the ocean surface with above-average SST, in the central and eastern tropical Pacific Ocean.
About Neutral:
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