Subject: The Earth A direct thermally-driven and zonally symmetric large- scale atmospheric circulation first proposed by George Hadley in 1735 as an explanation for the trade winds. It carries momentum, sensible heat, and potential heat from the tropics to the mid-latitudes (30 degrees). The poleward transport aloft is complemented by subsidence in the subtropical high pressure ridge and a surface return flow. The variability of this cell and the Walker cell is hypothesized to be a major factor in short-term climatic change. [ Pics List
A direct thermally-driven and zonal symmetric circulation first proposed by George Hadley as an explanation of the trade winds. The cell consists of the equatorward movement of the trade winds between about latitude 30° and the equator in each hemisphere, with rising components near the equator, poleward flow aloft, and finally descending components at about latitude 30° again.
a thermal circulation consisting of rising air near the equator and sinking air near 30 degrees latitude
A north south (meridional) circulation consisting of upward motion at the ITCZ, poleward motion to both 30N and 30S, sinking motion at 30 degrees and an equatorward return flow to the ITCZ.
A thermal circulation proposed by George Hadley to explain the movement of the trade winds. It consists of rising air near the equator and sinking air near 30° latitude. Hail (Hailstones): Small pellets or balls of ice with diameters between 5 and 50mm (or even more) formed in Cb when raindrops are carried above the freezing level. Large hailstones consists of several layers of ice deposited during successive ascents above the freezing level. If the particles are smaller than 5mm they are called Ice Pellets or Graupel. The costliest hailstorm in the USA pounded parts of Colorado with hail the size of golfballs and baseballs, causing over $600,000,000 in damage on July 11, 1990
The Hadley cell is a circulation pattern that dominates the tropical atmosphere, with rising motion near the equator, poleward flow 10-15 kilometers above the surface, descending motion in the subtropics, and equatorward flow near the surface. This circulation is intimately related to the trade winds, tropical rainbelts, subtropical deserts and the jet streams.