Natural Climate Change
- Created by: Crystal Parsons
- Created on: 27-04-20 12:26
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- Natural Climate Change
- Evidence
- Tree Rings
- How do they work?
- Scientists assume that the growth is because of a wet, warm climate and they predict the weather.
- Pros
- Trees are natural and unbiased.
- Cons
- Other factors may have caused and influenced the growth.
- Nutrient abundance in the soil
- Fertilisers
- No competition for nutrients.
- Not easy to read.
- Other factors may have caused and influenced the growth.
- How do they work?
- Ice Cores
- How do they work?
- Scientists measure the levels of CO2 and Methane in the air and assume the temperature and climate.
- When glaciers are formed air is trapped and it forms bubbles.
- Pros
- Ice is natural and unbiased.
- Scientific.
- Cons
- Difficult because air might escape and the ice melts.
- How do they work?
- Paintings and Diaries
- How do they work?
- People painted pictures, drew on cave walls and wrote descriptions of the weather in their diaries.
- Cons
- Biased by humans – could be a futuristic/ dream picture rather than actual.
- How do they work?
- Global Temperature Data
- How does this work?
- We can see temperature readings that have been taken and plotted on graphs.
- Pros
- Very accurate.
- Cons
- Not long-term.
- How does this work?
- Tree Rings
- Causes
- Sun Spots
- Black spots appear on the surface of the sun.
- Although they are dark in colour, they are hotter areas.
- The more sun spots there are the more heat given out.
- Although they are dark in colour, they are hotter areas.
- Black spots appear on the surface of the sun.
- Milankovitch Cycles
- Precession
- In 23,000 years the earth's axis can wobble.
- This means that the earth is sometimes closer or farther away from the sun.
- This changes the amount of solar energy reaching the earth and can causes climate change.
- This means that the earth is sometimes closer or farther away from the sun.
- In 23,000 years the earth's axis can wobble.
- Axial Tilt
- Over a period of 41,000 years the tilt of the earth can change.
- The earth's axial tilt is usually at an angle of 23.5' away from the sun.
- The axial tilt can vary to 1' closer (22.5') or 1' further away (24.5).
- This changes the amount of solar energy reaching the earth and can affect the climate.
- The axial tilt can vary to 1' closer (22.5') or 1' further away (24.5).
- The earth's axial tilt is usually at an angle of 23.5' away from the sun.
- Over a period of 41,000 years the tilt of the earth can change.
- Eccentricity
- Every 100,000 years the orbit of the Earth changes.
- The orbit can be circular or elliptical.
- When it's elliptical the earth is sometimes farther away and sometimes nearer the sun.
- This changes the amount of solar energy reaching the earth and can affect the climate.
- When it's elliptical the earth is sometimes farther away and sometimes nearer the sun.
- The orbit can be circular or elliptical.
- Every 100,000 years the orbit of the Earth changes.
- Precession
- Volcanic Activity
- During eruptions gases (like sulfur dioxide) and ash get blown all around the earth.
- The particles block sunlight from entering the earth and/or reflect the sunlight back into space.
- The lack of sunlight can cause the whole earth to cool down.
- The particles block sunlight from entering the earth and/or reflect the sunlight back into space.
- During eruptions gases (like sulfur dioxide) and ash get blown all around the earth.
- Sun Spots
- Evidence
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