First page Back Continue Last page Overview Graphics
DomeC Cross Correlation
DomeC has finer resolution CO2 measurements
- Shows apparent correlation of CO2 to future Temp
- Frequently misinterpreted as a causal dependency
- Also shows earlier correlation to opposite change
- This is an aliasing effect which really indicates
- CO2 increase -> Temp Decrease -> Temp Increase
- Indicates correlation across a period of unrelated change
- Indicates interference from a periodic effect
When smoothing is applied
- Same results as Vostok data
Notes:
The DomeC data appears to show a correlation between CO2 and future temperatures, which has frequently been misinterpreted as evidence of CO2 forcing.
However, this is a result of a correlation of CO2 to aliased short term variability. This appears when little or no smoothing is applied and is an artifact of CO2 being correlated across a period of short term temperature change. This can be confirmed by applying 200 year smoothing. After doing so, the delay of the bump increases from 200 years to 400 years. Applying 400 year smoothing pushes it out even farther. If this was a causal effect, the delay would be insensitive to changes in the smoothing interval.
When the appropriate smoothing is applied, the DomeC data produces the same results as the Vostok data.