GEOG climate change

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  • Created by: AlyxF
  • Created on: 20-02-16 18:31

Theme 2 - What weather and climate results from high and low pressure systems?

Depressions and anticyclones:

A large amount of information is continually recorded at weather stations around the world. Data collected includes precipitation, temperature, wind speed and direction, sunshine and atmospheric (air) pressure. Air pressure is used to build up synoptic charts (weather maps) which show the positions and nature of low and high pressure areas. The centres of low pressure are called depressions and the centres of high pressure are called anticyclones.

key words:

weather - day-to-day changes in the atmosphere.

climate - average weather conditions over a period of usually at least 30 years.

pressure system - a large mass of air having similar air pressure characteristics.

Types of rainfall:

Rain falls in a depression as air rises. It is called frontal rain. Rising air also results in rainfall as air heats and rotates, and as the air passed over hills and mountains (orographic rain) or in thunderstorms (convectional rain).

Theme 2 - How do anticyclones and depressions affect activities and quality of life?

Severe weather events:

A cyclone is a severe depression. Severe depressions are also called hurricanes.

Exam practice:

1. Describe the path takes by Cyclone Nargis between 28 April and 4 May 2008.

Between 28 April and 29 April the cyclone was a tropical storm heading North West towards India then on the 29 April it changes direction to North East until 2 May heading towards Myanmar as a hurricane then half way between 2 May and 4 May it changes direction to East heading towards Yangon as a hurricane but then when it gets there it changes direction to North heading towards the centre of Myanmar as a tropical storm.

2. Suggest how the cyclone may have affected the ives of people in southern Myanmar.

Most of the villagers


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