Question

what is difference between Hadley cell and Walker cell

Answer 1

The Hadley cell, named after George Hadley, is a global scale tropical atmospheric circulation that features air rising near the equator, flowing poleward at 10–15 kilometers above the surface, descending in the subtropics, and then returning equatorward near the surface. This circulation creates the trade winds, tropical rain-belts and hurricanes, subtropical deserts and the jet streams.

In each hemisphere, there is one primary circulation cell known as a Hadley cell and two secondary circulation cells at higher latitudes, between 30° and 60° latitude known as the Ferrel cell, and beyond 60° as the Polar cell. Each Hadley cell operates between zero and 30 to 40 degrees north and south and is mainly responsible for the weather in the equatorial regions of the world.

The Walker circulation, also known as the Walker cell, is a conceptual model of the air flow in the tropics in the lower atmosphere (troposphere). According to this model, parcels of air follow a closed circulation in the zonal and vertical directions. This circulation, which is roughly consistent with observations, is caused by differences in heat distribution between ocean and land. It was discovered by Gilbert Walker. In addition to motions in the zonal and vertical direction the tropical atmosphere also has considerable motion in the meridional direction as part of, for example, the Hadley Circulation.

The term "Walker circulation" was coined in 1969 by the Norwegian-American meteorologist.....