An influence of solar spectral variations on radiative forcing of climate

Joanna D. Haigh (), Ann R. Winning, Ralf Toumi and Jerald W. Harder
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Joanna D. Haigh: Blackett Laboratory, Imperial College London
Ann R. Winning: Blackett Laboratory, Imperial College London
Ralf Toumi: Blackett Laboratory, Imperial College London
Jerald W. Harder: Laboratory for Atmospheric and Space Physics, University of Colorado

Nature, 2010, vol. 467, issue 7316, 696-699

Abstract: Solar spectrum variation and climate Current understanding suggests that radiative forcings over the course of an 11-year solar cycle are in phase with related influences on climate. Recent satellite data have revealed, however, that there seems to be a surprising spectral component to solar variability, at least in the declining phase of the current solar cycle: UV radiation decreases strongly while visible radiation increases. Joanna Haigh and colleagues now show that these spectral variations — when incorporated into a radiative-photochemical model — lead to decreases in ozone below 45 kilometres and increases above. As a consequence of the ozone changes, radiative forcing of surface climate is out of phase with solar activity. This finding, although based on a short record from a potentially anomalous solar cycle, suggests that a major revision to our current understanding of solar forcing of climate may be in order.

Date: 2010
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DOI: 10.1038/nature09426

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