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Advances in Science and Research The open-access proceedings of the European Meteorological Society (EMS)

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Adv. Sci. Res., 14, 35-48, 2017
https://doi.org/10.5194/asr-14-35-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
21 Feb 2017
Do modelled or satellite-based estimates of surface solar irradiance accurately describe its temporal variability?
Marc Bengulescu1, Philippe Blanc1, Alexandre Boilley2, and Lucien Wald1 1MINES ParisTech, PSL Research University, Centre for Observation, Impacts, Energy, CS 10207, 06904 Sophia Antipolis CEDEX, France
2Transvalor SA, 694 Avenue du Dr. Maurice Daunat, 06255 Mougins CEDEX, France
Abstract. This study investigates the characteristic time-scales of variability found in long-term time-series of daily means of estimates of surface solar irradiance (SSI). The study is performed at various levels to better understand the causes of variability in the SSI. First, the variability of the solar irradiance at the top of the atmosphere is scrutinized. Then, estimates of the SSI in cloud-free conditions as provided by the McClear model are dealt with, in order to reveal the influence of the clear atmosphere (aerosols, water vapour, etc.). Lastly, the role of clouds on variability is inferred by the analysis of in-situ measurements. A description of how the atmosphere affects SSI variability is thus obtained on a time-scale basis. The analysis is also performed with estimates of the SSI provided by the satellite-derived HelioClim-3 database and by two numerical weather re-analyses: ERA-Interim and MERRA2. It is found that HelioClim-3 estimates render an accurate picture of the variability found in ground measurements, not only globally, but also with respect to individual characteristic time-scales. On the contrary, the variability found in re-analyses correlates poorly with all scales of ground measurements variability.

Citation: Bengulescu, M., Blanc, P., Boilley, A., and Wald, L.: Do modelled or satellite-based estimates of surface solar irradiance accurately describe its temporal variability?, Adv. Sci. Res., 14, 35-48, https://doi.org/10.5194/asr-14-35-2017, 2017.
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This study investigates the characteristic time-scales of variability found in long-term time-series of daily means of surface solar irradiance (SSI). Estimates of SSI from satellite-derived HelioClim-3 and radiation products from ERA-Interim and MERRA-2 re-analyses are compared to WRDC measurements. It is found that HelioClim-3 renders a more accurate picture of the variability found in ground measurements, not only globally, but also with respect to individual characteristic time-scales.
This study investigates the characteristic time-scales of variability found in long-term...
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