The impact of a future solar minimum on climate change projections in the Northern Hemisphere



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Chiodo, G. and García Herrera, Ricardo and Calvo Fernández, Natalia and Vaquero, J. M. and Añel, J. A. and Barriopedro Cepero, David and Matthes, K. (2016) The impact of a future solar minimum on climate change projections in the Northern Hemisphere. Environmental research letters, 11 (3). ISSN 1748-9326

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Solar variability represents a source of uncertainty in the future forcings used in climate model simulations. Current knowledge indicates that a descent of solar activity into an extended minimum state is a possible scenario. With aid of experiments from a state-of-the-art Earth system model, we investigate the impact of a future solar minimum on Northern Hemisphere climate change projections. This scenario is constructed from recent 11 year solar-cycle minima of the solar spectral irradiance, and is therefore more conservative than the 'grand' minima employed in some previous modeling studies. Despite the small reduction in total solar irradiance (0.36 W m^-2), relatively large responses emerge in the winter Northern Hemisphere, with a reduction in regional-scale projected warming by up to 40%. To identify the origin of the enhanced regional signals, we assess the role of the different mechanisms by performing additional experiments forced only by irradiance changes at different wavelengths of the solar spectrum. We find that a reduction in visible irradiance drives changes in the stationary wave pattern of the North Pacific and sea-ice cover. A decrease in UV irradiance leads to smaller surface signals, although its regional effects are not negligible. These results point to a distinct but additive role of UV and visible irradiance in the Earth's climate, and stress the need to account for solar forcing as a source of uncertainty in regional scale projections.

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© 2016 IOP Publishing Ltd.
We thank the editor for handling this paper and the anonymous reviewers for their constructive feedback. We also gratefully acknowledge Isla Simpson and Minfang Ting for providing the stationary wave model code. This research has been supported by the Supercomputing Centre of Galicia (CESGA) through three ICTS projects and FEDER funds. In addition, computing resources were also provided by the Barcelona Supercomputing Center through three RES activities, and by the EOLO cluster of excellence at Universidad Complutense de Madrid. G Chiodo was partly supported by the Spanish Ministry of Education in the framework of the FPU doctoral fellowship (grant AP2009-0064). This work was supported by the Spanish Ministry of Science and Innovation (MCINN) through the CONSOLIDER (CSD2007-00050-II-PR4/07), MATRES (CGL2012-34221), and ExCirEs (CGL2011-24826) projects, and by the European Commission within the FP7 framework through the StratoClim project (Ref. 603557). JM Vaquero acknowledges the support from the Junta de Extremadura (Research Group Grants GR10131) and from the Spanish Government (AYA2011-25945 and AYA2014-57556-P). The authors also aknowledge the COST Action ES1005 TOSCA ( and the WCRP/SPARC SOLARIS-HEPPA project (

Uncontrolled Keywords:Sea-surface temperature; Pacific SST anomalies; Artic amplification; Spectral irradiance; Maunder minimum; Variability; Cycle; Oscillation; Circulation; Flow
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:37685
Deposited On:17 May 2016 13:56
Last Modified:10 Dec 2018 15:04

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