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Earth System Dynamics An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 3
Earth Syst. Dynam., 7, 597–609, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Earth Syst. Dynam., 7, 597–609, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Peer-reviewed comment 13 Jul 2016

Peer-reviewed comment | 13 Jul 2016

Comment on "Scaling regimes and linear/nonlinear responses of last millennium climate to volcanic and solar forcing" by S. Lovejoy and C. Varotsos (2016)

Kristoffer Rypdal and Martin Rypdal

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Cited articles

Caldeira, K. and Myhrvold, N.: Projections of the pace of warming following an abrupt increase in atmospheric carbon dioxide concentration, Environ. Res. Lett., 8, 034039,, 2013.
Fredriksen, H.-B. and Rypdal, K.: Spectral Characteristics of Instrumental and Climate Model Surface Temperatures, J. Climate, 29, 1253–1268,, 2016.
Geoffroy, O., Saint-Martin, D., Olivié, D. J. L., Voldoire, A., Bellon, G., and Tytcá, S.: Transient Climate Response in a Two-Layer Energy-Balance Model. Part I: Analytical Solution and Parameter Calibration Using CMIP5 AOGCM Experiments, J. Climate, 6, 1841–1857,, 2013.
Held, I. M., Winton, M., Takahashi, K., Delworth, T., Zenge, F., and Vallis, G. K..: Probing the Fast and Slow Components of Global Warming by Returning Abruptly to Preindustrial Forcing, J. Climate, 23, 2418–2427,, 2010.
Kirkevåg, A., Iversen, T., Kristjánsson, J. E., Seland, Ø., and Debernard, J. B.: On the additivity of climate response to anthropogenic aerosols and CO2, and the enhancement of future global warming by carbonaceous aerosols, Tellus A, 60, 513–527,, 2008.
Publications Copernicus
Short summary
This comment on the paper by Lovejoy and Varotsos demonstrates that their methods for establishing nonlinearity in the global temperature response in climate models are flawed. One of their methods is based on an invalid approximation, which when corrected does not falsify the hypothesis that the response is linear. This conclusion is enforced when internal variability in the models are accounted for. The other results in their paper are also shown to be reproduced by linear-response models.
This comment on the paper by Lovejoy and Varotsos demonstrates that their methods for...