Slayt 1 - RTC, Regional Training Centre - Turkey

Horizontal advection of west-to-east wind The graphic depicts an idealized situation to explain how advection of a quantityby the wind works.1. Vertical advection of west-to-east wind2. Deviations from the geostrophic balance ofthe south-to-north wind component.Imbalances between the west-to-eastpressure gradient force and the Coriolisforce acting on the south-to-north wind willchange the west-to-east wind3. Other physical processes, such as surfacefriction and turbulent mixing acting on thewest-to-east wind. The models also includeempirical approximations to try to accountfor atmospheric processes that cannot beforecast directly, although some of theeffects are indirect. For example, radiationand convection are applied only to thetemperature and moisture equations andare not included explicitly in the windforecast equations. However, the changesin temperature at one time will causechanges in the pressure gradient, which inturn will affect the wind at a later time