Abstract
Observations indicate that solar radiation incident at the Earth surface underwent substantial decadal variations in the second half of the twentieth century, with a tendency towards reduction from the 1950s to the 1980s (“global dimming”) and a partial recovery thereafter (“brightening”) at widespread locations. The most reliable observational records from the Global Energy Balance Archive (GEBA) are used to evaluate the ability of the climate models participating in CMIP3/IPCC-AR4 as well as the ERA40 reanalysis to reproduce these decadal variations. The results from 23 models and reanalysis are analyzed in five different climatic regions where strong decadal variations in surface solar radiation (SSR) have been observed. Only about half of the models are capable of reproducing the observed decadal variations in a qualitative way, and all models show much smaller amplitudes in these variations than seen in the observations. Largely differing tendencies between the models are not only found under all-sky conditions, but also in cloud-free conditions and in the representation of cloud effects. The ERA40 reanalysis neither reproduces the major decadal variations in SSR, despite strong observational constraints on the temporal evolution of the state of the atmosphere, since time varying aerosol loadings are missing. Climate models and reanalyses are therefore not yet at a stage to provide regionally consistent estimates of decadal changes in SSR. Reproduction of these changes would be essential for an adequate representation of regional scale climate variations and impacts, and short-term (decadal) climate projections.
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Acknowledgments
This study is supported by the National Centre for Competence in Climate Research (NCCR Climate) of the Swiss National Science Foundation. We would like to thank Prof. Christoph Schaer for the continuous support of our work. We acknowledge the international modeling groups for providing their data for analysis, the Program for Climate Model Diagnosis and Intercomparison (PCMDI) for collecting and archiving the model data, the JSC/CLIVAR Working Group on Coupled Modelling (WGCM) and their Coupled Model Intercomparison Project (CMIP) and Climate Simulation Panel for organizing the model data analysis activity, and the IPCC WG1 TSU for technical support. The IPCC Data Archive at Lawrence Livermore National Laboratory is supported by the Office of Science, U.S. Department of Energy. Doris Folini is highly acknowledged for her support of this study. We highly appreciate the constructive comments of two anonymous reviewers. This paper contributes to the efforts of the working group “Global Energy Balance” of the International Radiation Commission (IRC).
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Wild, M., Schmucki, E. Assessment of global dimming and brightening in IPCC-AR4/CMIP3 models and ERA40. Clim Dyn 37, 1671–1688 (2011). https://doi.org/10.1007/s00382-010-0939-3
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DOI: https://doi.org/10.1007/s00382-010-0939-3