Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 4.252 IF 4.252
  • IF 5-year value: 4.890 IF 5-year 4.890
  • CiteScore value: 4.49 CiteScore 4.49
  • SNIP value: 1.539 SNIP 1.539
  • SJR value: 2.404 SJR 2.404
  • IPP value: 4.28 IPP 4.28
  • h5-index value: 40 h5-index 40
  • Scimago H index value: 51 Scimago H index 51
Volume 7, issue 4
Geosci. Model Dev., 7, 1661-1669, 2014
https://doi.org/10.5194/gmd-7-1661-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Monitoring atmospheric composition and climate, research in...

Geosci. Model Dev., 7, 1661-1669, 2014
https://doi.org/10.5194/gmd-7-1661-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Model description paper 14 Aug 2014

Model description paper | 14 Aug 2014

Decoupling the effects of clear atmosphere and clouds to simplify calculations of the broadband solar irradiance at ground level

A. Oumbe1,*, Z. Qu1, P. Blanc1, M. Lefèvre1, L. Wald1, and S. Cros2,** A. Oumbe et al.
  • 1MINES ParisTech, PSL Research University, O.I.E. – Centre Observation, Impacts, Energy – Sophia Antipolis, France
  • 2Laboratoire de Météorologie Dynamique, IPSL/CNRS, UMR 8539, Ecole Polytechnique, France
  • *now at: Total New Energies, R&D – Solar, Paris la Défense, France
  • **now at: Reuniwatt, Sainte-Clotilde, Réunion, France

Abstract. In the case of infinite plane-parallel single- and double-layered cloud, the solar irradiance at ground level computed by a radiative transfer model can be approximated by the product of the irradiance under clear atmosphere and a modification factor due to cloud properties and ground albedo only. Changes in clear-atmosphere properties have negligible effect on the latter so that both terms can be calculated independently. The error made in using this approximation depends mostly on the solar zenith angle, the ground albedo and the cloud optical depth. In most cases, the maximum errors (95th percentile) on global and direct surface irradiances are less than 15 W m−2 and less than 2–5% in relative value. These values are similar to those recommended by the World Meteorological Organization for high-quality measurements of the solar irradiance. Practically, the results mean that a model for fast calculation of surface solar irradiance may be separated into two distinct and independent models, possibly abacus-based, whose input parameters and resolutions can be different, and whose creation requires less computation time and resources than a single model.

Please read the corrigendum first before accessing the article.
Publications Copernicus
Special issue
Download
Notice on corrigendum

The requested paper has a corresponding corrigendum published. Please read the corrigendum first before downloading the article.

Citation
Share