Elevation tends to cause pressure centers to become intensified when altitude is increased. This is especially true of high pressure systems. Atmosphere pressure values are adjusted for elevation and are described relative to sea-level. The slider at the bottom of the image allows you change the time of month. Blue shades indicate pressure lower than the global average, while yellow to orange shades are higher than average measurements.
Wind direction is shown with arrows.
The intertropical convergence zone is identified on the figures by a red line. The formation of this band of low pressure is the result of solar heating and the convergence of the trade winds. During this time period, the Southern Hemisphere is tilted towards the sun and receives higher inputs of shortwave radiation. Note that the line representing the intertropical convergence zone is not straight and parallel to the lines of latitude. Bends in the line occur because of the different heating characteristics of land and water.