What is meridional circulation of atmosphere? Discuss its significance.

Atmospheric Circulation are Cycles which takes excess heat from equatorial region to heat deficit Polay region

Fig: Tricellular meridional Circulation

Mechanism

Low pressure area at equator due to excess heat make the air rise which then descends at subtropical High pressure belt 8ereating High pressure at poles pushes air towards temperature low pressure belt thereby creating a cycle

Significance

Heat balance - otherwise poles would have - 100°C and equator would by >100°C

Existence of life - without this no life would be possible on earth

helps in nutrient cycles too

Percipitation is possible due to this only

It also impacts oceanic circulation