global atmospheric circulation cells

Question 1

Hadley cell

Answer 1

At the equator the ground is intesnley heated causing air to rise. this creates a low pressure zone, as the air rises it cools and forms thick cumulonimbus clouds on the earths surface. The air continues to rise up to the upper atmosphere.
The air then moves north and south towards the poles when it reaxhes 30 degrees it cools and sinks forming the subtropical high pressure zone. As the air sinks it becomes drier and warmer

Question 2

polar cell

Answer 2

At the polar cell air is cooled and and sinks towards the ground forming a high pressure zone this is known as the polar high. It even flows towards the lower latitudes at 60 degrees north and south the cold polar air mixes with warm tropical air creating a zone of low pressure

Question 3

Ferrel cell

Answer 3

this occours at higher latitudes, air on the surface to pulled towards the polar. These winds pick up moisture as they travel over the oceans at 60 degrees north and 60 degrees south they meet over the oceans which has drifted from the poles. The warmer the air from the tropics is lighter than the dense cold polar air and so it risers as the 2 air masses meet. This lift of air of air causes low pressure at the surface and then unstable weather conditions that are associated with mid latitude depressions. Much of the wet and windy weather the UK gets is determined by this.

Question 4

global atmospheric model

Answer 4

• the cold air travelling south from the poles meets the warm air travelling north. they can miz so the warm air rises forming clouds and rainfall.
  -air begins to sink as it cools, this creates an area of high pressure.
• High=dry so no clouds no rain, air at the equator rises cools and condenses to form clouds leading to convectional rainfall. Low pressure.
  -the ferrel cell acts as a result of the other 2 cells. warm air rising in the polar cells drags warm air ferrel cell up cold air in the Hadley cell falls, draging air from the Ferrel cell with it.
  -The surface winds near the equator are known as “trade winds” air moving from high to low presssure, curved due to the coriolis effect(earths rotation)
• The surface winds near the Ferrel cell are known as “westerlies “ air is moving from high to low pressure, curved due to the coriolis effect (earths rotation)