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Advances in Science and Research Contributions in Applied Meteorology and Climatology
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Volume 6, issue 1 | Copyright
Adv. Sci. Res., 6, 199-203, 2011
https://doi.org/10.5194/asr-6-199-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Aug 2011

03 Aug 2011

Solar irradiance in clear atmosphere: study of parameterisations of change with altitude

A. Oumbe1, Ph. Blanc2, B. Gschwind2, M. Lefevre2, Z. Qu2, M. Schroedter-Homscheidt1, and L. Wald2 A. Oumbe et al.
  • 1German Remote Sensing Data Center, German Aerospace Center (DLR), Oberpfaffenhofen, Germany
  • 2Centre for Energy and Processes, MINES ParisTech, BP 204, 06905 Sophia Antipolis cedex, France

Abstract. Parameterisation of changes of the solar irradiance at ground level with a specific variable (e.g. solar zenithal angle, aerosol optical depth, altitude, etc.) is often used in operational processes because it saves computational time. This paper deals with the modelling of the vertical profile of downwelling solar irradiance for the first two kilometres above ground in clear sky conditions. Two analytical parameterisations are evaluated for direct and global irradiance in spectral bands as well as for the total irradiance. These parameterisations reproduce the vertical profile with good accuracy for global spectral irradiance and are less accurate for direct component, especially in turbid atmosphere. A piecewise linear interpolation technique using irradiance values known at surface and 4 altitudes every 500 m performs better in any case.

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