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AGU: Geophysical Research Letters

 

Index Terms

  • Global Change: Solar variability
  • Global Change: Climate dynamics
  • Meteorology and Atmospheric Dynamics: Paleoclimatology
  • Solar Physics, Astrophysics, and Astronomy: Solar and stellar variability

Abstract

Reconstruction of solar irradiance since 1610: Implications for climate change

Judith Lean

E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC

Juerg Beer

Swiss Federal Institute for Environmental Science and Technology, Dübendorf, Switzerland

Raymond Bradley

Department of Geosciences, University of Massachusetts, Amherst, MA

Solar total and ultraviolet (UV) irradiances are reconstructed annually from 1610 to the present. This epoch includes the Maunder Minimum of anomalously low solar activity (circa 1645–1715) and the subsequent increase to the high levels of the present Modern Maximum. In this reconstruction, the Schwabe (11‐year) irradiance cycle and a longer term variability component are determined separately, based on contemporary solar and stellar monitoring. The correlation of reconstructed solar irradiance and Northern Hemisphere (NH) surface temperature is 0.86 in the pre‐industrial period from 1610 to 1800, implying a predominant solar influence. Extending this correlation to the present suggests that solar forcing may have contributed about half of the observed 0.55°C surface warming since 1860 and one third of the warming since 1970.

Received 15 June 1995; accepted 28 August 1995; .

Citation: Lean, J., J. Beer, and R. Bradley (1995), Reconstruction of solar irradiance since 1610: Implications for climate change, Geophys. Res. Lett., 22(23), 3195–3198.

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