Research Papers

Local enhanced solar irradiance on the ground generated by cirrus: measurements and interpretation

[+] Author Affiliations
Gérard Thuillier, Philippe Keckhut

LATMOS-CNRS-IPSL, 11 Blvd d’Alembert, 78280 Guyancourt, France

Jean-Marie Perrin

LATMOS-CNRS-IPSL, 11 Blvd d’Alembert, 78280 Guyancourt, France

Observatoire de Haute Provence CNRS-AMU-OSU IP, 04870 Saint Michel l’Observatoire, France

François Huppert

Observatoire de Haute Provence CNRS-AMU-OSU IP, 04870 Saint Michel l’Observatoire, France

J. Appl. Remote Sens. 7(1), 073543 (Jun 25, 2013). doi:10.1117/1.JRS.7.073543
History: Received March 5, 2013; Revised April 19, 2013; Accepted May 1, 2013
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Abstract.  This study concerns the influence of thin cirrus on the solar irradiance budget on the ground, using data obtained by remote sensing from a set of instruments operated at the Observatoire de Haute Provence (France). Comparisons between solar irradiance ground-based measurements obtained during clear and cloudy days usually show a lower irradiance in the latter case as expected. However, there are cases lasting a maximum of 30 min for which the solar irradiance is greater in the presence of cumulus than in clear-sky conditions, and this phenomenon was named enhanced solar irradiance. Our pyranometer measurements reveal the same phenomenon associated with the presence of thin clouds alone, as revealed by a daytime wide-field camera and occurring both in total and UVB* (280 to 320 nm) solar irradiance. In the case of thin cirrus, this phenomenon can last up to several hours. To understand this phenomenon, we have developed a model of solar light scattering within thin cirrus clouds that takes into account the presence of the atmosphere. The model reproduces the enhanced solar irradiance phenomenon in total and UBV* spectral range. Monoscattering and multiscattering processes inside the cirrus clouds also will be discussed.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Gérard Thuillier ; Jean-Marie Perrin ; Philippe Keckhut and François Huppert
"Local enhanced solar irradiance on the ground generated by cirrus: measurements and interpretation", J. Appl. Remote Sens. 7(1), 073543 (Jun 25, 2013). ; http://dx.doi.org/10.1117/1.JRS.7.073543


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