Articles | Volume 7, issue 1
Earth Syst. Dynam., 7, 133–150, 2016
https://doi.org/10.5194/esd-7-133-2016
Earth Syst. Dynam., 7, 133–150, 2016
https://doi.org/10.5194/esd-7-133-2016
Research article
23 Feb 2016
Research article | 23 Feb 2016

Scaling regimes and linear/nonlinear responses of last millennium climate to volcanic and solar forcings

Shaun Lovejoy and Costas Varotsos

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Short summary
We compare the statistical properties of solar, volcanic and combined forcings over the range from 1 to 1000 years to see over which scale ranges they additively combine, a prediction of linear response. The main findings are (a) that the variability in the Zebiac–Cane model and GCMs are too weak at centennial and longer scales; (b) for longer than ≈ 50 years, the forcings combine subadditively; and (c) at shorter scales, strong (intermittency, e.g. volcanic) forcings are nonlinear.
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