Global Winds

A pattern of global atmospheric circulation is set up by the unequal distribution of insolation.

There are three major winds in a hemisphere :

  1. polar easterlies (cold and dry)
  2. westerlies (highly variable, contains the jet streams)
  3. trade winds (reliable and warm)

There are four major pressure zones in a hemisphere :

  1. polar high pressure zone (90° N and S latitude)
  2. subpolar low pressure zone (60° N and S latitude)
  3. subtropical high pressure zone (30° N and S latitude)
  4. intertropical convergence zone (equator)

Things to remember about air motion :