Analysis of Different Solar Spectral Irradiance Reconstructions and Their Impact on Solar Heating Rates
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Proper numerical simulation of the Earth’s climate change requires reliable knowledge of solar irradiance and its variability on different time scales, as well as the wavelength dependence of this variability. As new measurements of the solar spectral irradiance have become available, so too have new reconstructions of historical solar irradiance variations, based on different approaches. However, these various solar spectral irradiance reconstructions have not yet been compared in detail to quantify differences in their absolute values, variability, and implications for climate and atmospheric studies. In this paper we quantitatively compare five different reconstructions of solar spectral irradiance changes during the past four centuries, in order to document and analyze their differences. The impact on atmosphere and climate studies is discussed in terms of the calculation of short wave solar heating rates.
KeywordsSolar spectral irradiance model Reconstruction
This investigation is supported by the Centre National de la Recherche Scientifique (F), Centre National d’Etudes Spatiales (F), the Federal Office for Scientific, Technical and Cultural Affairs (B). The participating institutes are LATMOS-CNRS (F) (formerly Service d’Aéronomie), Department of Physics of the University of Toronto (Ca), Canadian Space Agency, Institut für Sonnensystemforschung of Max-Planck (G), Départment de Physique of Université de Montréal (Ca), York University (Ca), Physikalisch-Meteorologisches Observatorium Davos-World Radiation Center (Ch), Institut d’Aéronomie Spatiale de Belgique. J. Lean acknowledges NASA support. A. Shapiro is supported by the Swiss National Science Foundation under grant CRSI122-130642 (FUPSOL). C. Bolduc and P. Charbonneau acknowledge support from FQRNT-Québec (Team grant 119078). W. Schmutz acknowledges support from Swiss COST office (grant nr. C11.0135). A. Shapiro, N. Krivova, W. Schmutz participate in the COST action ES 1005 (TOSCA) and profit from the COST meetings. This article is a contribution to the SOLID investigation.
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