Science Source
Detecting climate signals in the surface temperature record
- Applies optimal signal detection theory in a search through 100 yr of surface temperature data for the climate response to four specific radiative forcings
- Estimates were sought of the strengths of the climate response to solar variability, volcanic aerosols, greenhouse gases, and anthropogenic aerosols
- Finds that the component of the volcanic response perpendicular to the other signals was very robust and highly significant
- Finds the component of the greenhouse gas response perpendicular to the others was very robust and highly significant
- When the sum of all four climate forcings was used, the climate response was more than three standard deviations above the noise level
- These findings are considered to be powerful evidence of anthropogenically induced climate change
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