weather & climate - mill hill school€¦ · weather & climate weather is the day to day...
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Weather & Climate
Weather is the day to day atmospheric conditions - hot/cold, wet/dry, windy, cloudy Climate is the average weather over a period of time (several years) – polar, tropical, desert
Factors affecting climate
Distance from sea
H – Himalayas (mountains are cold) Greenland’s ice reflects the sun Southern hemisphere – does not get so cold as there is more ocean warming it Northern hemisphere has more landmass so gets either hotter or colder depending on the session
Our prevailing wind is from the South West – so warm and wet (Tropical Maritime)
Prevailing Winds in the UK
Ocean currents
Warm water from the Caribbean warms Britain – which should be as cold as Canada!
North Atlantic Drift
Relief and Rainfall
Britain temps
Types of rainfall
Relief Frontal Convectional
Warm air rises cools and water vapour condenses to form clouds which leads to rain
Climate graph
This is the climate graph for Britain
This is the climate graph for a hot desert, i.e. the Sahara
This is the climate graph for the Mediterranean
This is the climate graph for Equatorial climate, i.e. in Nigeria
The bar graph is for the average rainfall, and the line graph is for the average temperature
Microclimate Aspect – south facing slopes are warmer
Relief/altitude – higher land is colder and exposed to wind
Surface – darker surfaces absorb heat, light materials reflect light
Buildings – give off heat (central heating/air conditioning) cities create
their own microclimate known as Urban Heat Island
Distance to water – has an insulating effect in summer and radiates heat in winter
Shelter – protect from the wind
Floods
Floods Causes
Heavy rain Continuous rain Steep slope Impermeable soil Snow melt Saturated / waterlogged Soil Drought – causes dry hard ground
Deforestation Urbanisation Changes to drainage - bridges
Physical factors Human factors
Floods - effects Property destroyed Loss of life Transport disrupted Economy damaged Habitats destroyed – plants & animals die Loss of power supply Water polluted - disease Famine – crops destroyed
Flood defence/prevention
Afforestation – plant trees Embankments / levees– higher river banks Straighten channels Widen / deepen channels Secondary channels Build dams
Bangladesh - case study Polluted water supplies Famine Drowning Property destruction Transport & communication links damaged
Climate – average weather over a period of time
Weather – day to day atmospheric conditions
Microclimate – climate in a small area
Relief rainfall – rain cause by moist air rising over mountains
Glossary