Tropical circulation & El Nino

3 important questions on Tropical circulation & El Nino

What is a Hedley cell?

A atmospheric circulation that features air rising near the equator, flowing poleward (at a height of 10 to 15 km above the earth's surface), descending in the subtropics and then returning to to equator near the surface.

What is another word for low pressure systems?

Synoptic-scale cyclones

In what season are the walker circulation the weakest?

In spring

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