Earth System Dynamics
Earth System Dynamics
ESD
Articles | Volume 7, issue 1
Articles | Volume 7, issue 1
https://doi.org/10.5194/esd-7-133-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/esd-7-133-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 7, issue 1
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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