Look at figure 13.1 and analyze the graph of global average temperature variatio
ID: 607 • Letter: L
Question
Look at figure 13.1 and analyze the graph of global average temperature variation and carbon dioxide concentration over the past 400,000 years. Based on this graph:
How were scientists able to collect the temperature and carbon dioxide data to construct this graph?
Describe the correlation of temperature and carbon dioxide.
Over the past 400,000 years, what has been the lowest temperature and what has been the highest temperature? When did they occur?
Describe the carbon dioxide concentration trend over the last 10,000 years. What can you say about the temperature trend over the last 10,000 years?
Explanation / Answer
1. Carbon di oxide content can be obtained by analyzing soil samples. Looking at different strata of soil, one can go back to old times and find out the CO2 content of the soil. In a similar way, temperature data is also obtained
2. The CO2 content and temperature variation have high positive correlation, possibly closer to 1. This is because, temperature profile closely matches CO2 variation with a little lag.
3. Lowest temperature was seen roughtly 25000 years BP and is equal to -9. Highest temperature has occured in 0 years BP and is equal to +3
4. CO2 trend over the last 10000 years is roughly constant and is fluctuating around 320 ppmv. This value is substantially higher when compared to 20000 years BP. Temperature trend over the last 10000 years has shown constant rise
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