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3 Cards in this Set
- Front
- Back
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Name and describe 2 external factors which affect climate change |
Solar Output – variations in amount of energy given off by sun –sunspots can affect solar output – e.g. reduction in sunspot activitybetween 1645-1715 likely cause of Little Ice Age Orbital Geometry – earth’s orbit of the sun varies in shape – whencircular glacial periods have occurred, when elliptical warmerperiods result (Milankovitch Cylces) |
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Describe how volcanic activity can affect global climatechange |
Volcanic Dust puts huge amounts of ash and sulphurdioxide in the atmosphere – acts to block out solarradiation and can cause a decrease in globaltemperatures. e.g. Laki eruption – Iceland 1783 – reduced global temperatures and led to harvest failing in W Europe. |
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How does surface reflection affect globaltemperatures? |
Different types of surface have a different albedo – capacity ofsurface to reflect radiation. Lighter surfaces – e.g. snow and ice reflect large amounts ofradiation back to space (high albedo) – reduces temperatures. Reduction in snow and ice – less sunlight reflected back andtemperatures warm |
