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Climate Change - Coggle Diagram
Climate Change
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Concepts
We are currently in a interglacial period which are temperature spikes in-between glacial periods. However present global temperatures remain unnaturally high and fluctuating.
The Greenhouse Effect
Greenhouse gasses - Carbon dioxide (81%), Methane (10%), Nitrous oxide, Flourinated gasses, water vapour, ozone
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The greenhouse effect is a naturally occurring process in which greenhouse gases trap solar radiation inside the earth causing it to gradually warm
Impacts
Natural
Sun spot activity
The sun's output is not constant and solar radiation can be produced at a higher or lower rate. Sun spots show that the sun is more active causing in increase in atmospheric temperatures for a period of time
Volcanic eruptions
Large volcanic eruptions can produce enough sulphur dioxide gas and ash to create a reflective layer in the atmosphere reducing the amount of solar radiation that reaches the earth. This can temporarily decrease local / global temperatures
Milankovitch cycles
Milankovitch cycles are changes in the shape of the earth's orbit causing surface temperatures on the earth to increase or decrease due to a change in distance or exposure
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Data
Proxy indicators
Ice cores
Ice cores are used to measure the content of trapped air from up to 800,000 years ago within air pockets below ice covered landscapes. This can, for example, be used to measure the percentage of CO2 in the atmosphere during previous periods.
Disadvantages to this are that ice can be melted (ironically caused by climate change) and that ice cores only show data for the polar regions
Dendrachronology
Dendrochronology is the study of tree rings to investigate previous atmospheric conditions. Larger tree rings can show higher temperatures, higher CO2 levels, more rainfall, more sunlight, etc.
Disadvantages to this are that the trees must be chopped down in order to gain any information and also that individual factors cannot be measured with precision
Paintings / drawings
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However this is a very inaccurate method due to exaggeration / understatement and quality of drawings.
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