Vers une méthode automatique d'estimation de la distribution spectrale du rayonnement solaire. Cas du ciel clair. : Applications à la lumière du jour, photosynthèse et ultraviolet

Abstract : We are interested in the estimation of the spectral distribution of the solar irradiance on the ground in any place and time. Given the very small number of measurement stations on the ground, we suggest developing a digital method exploiting estimations of the atmospheric composition made daily. This method must be enough fast to be used in intensive mode in an operational way. The targeted fields of application are the ultraviolet (UV), photosynthesis and daylight; with a limitation in the case of the clear sky. Our first innovation is to leave paradoxically from very rapid numerical approaches of calculation of the total irradiance. These developed approaches give a description of the spectral distribution of solar irradiance in a number restricted by discrete bands. The finest and the most recent of these approaches is «k-distribution method and the correlated-k approximation» of Kato and al. (1999). It supplies estimations of the irradiance in 32 spectral bands. To achieve this PhD goal, we have first of all, studied the accuracy of the approach in each of 32 bands. The results are good in all the bands except in the UV. We proposed a novel parametrization of the transmittance of the ozone, which we integrated into the radiative transfer model libRadtran. Finally, we developed two techniques of re-sampling allowing to obtain from 32 discrete values, estimations of the irradiance in any spectral interval, including by taking into account a spectral response of the illuminated system. Experimental validations have been carried out by means of some measurement stations. The preliminary results are considered encouraging in comparison with the precision found on quality measuring instruments. Ways of improvements have been listed for a gain of notable precision.
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William Wandji Nyamsi. Vers une méthode automatique d'estimation de la distribution spectrale du rayonnement solaire. Cas du ciel clair. : Applications à la lumière du jour, photosynthèse et ultraviolet. Autre. Ecole Nationale Supérieure des Mines de Paris, 2015. Français. ⟨NNT : 2015ENMP0036⟩. ⟨tel-01297985⟩

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