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Earth System Dynamics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/esd-2019-50
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esd-2019-50
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  15 Oct 2019

15 Oct 2019

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This preprint was under review for the journal ESD but the revision was not accepted.

Spatial Signature of Solar Forcing over the North Atlantic Summer Climate in the Past Millennium

Maria Pyrina1, Eduardo Moreno-Chamarro2, Sebastian Wagner1, and Eduardo Zorita1 Maria Pyrina et al.
  • 1Helmholtz Zentrum Geesthacht, Institute of Coastal Research, Geesthacht, 21502, Germany
  • 2Barcelona Supercomputing Center, Barcelona, 08034, Spain

Abstract. We investigate the effects of solar forcing during summer on the North Atlantic climate in comprehensive simulations of the preindustrial last millennium. We use two Earth System Models forced only by variations in Total Solar Irradiance (TSI). Specifically, we examine how different statistical techniques commonly used in current literature, namely linear methods and composite techniques can condition our understanding of the effects of solar forcing on climate. We demonstrate that the results obtained are strongly shaped by internal model variability. Linear methods like regression and correlation are not suitable to separate solar impacts on summer climate from internal variability. Composite maps show a response of SSTs off the European coasts and atmospheric blocking-like pressure anomalies over the subpolar North Atlantic, with some model-dependent variations of its spatial patterns and extent. In the models analyzed, the relationship of TSI to the tropospheric and surface circulation is linked through a baroclinic response to diabatic heating at the ocean surface. A tendency toward blocking-like patterns over the middle and high latitudes might be subsequently created during summer and in high TSI periods.

Maria Pyrina et al.

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Maria Pyrina et al.

Maria Pyrina et al.

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