Remote sensing of lunar aureole with a sky camera: Adding information in the nocturnal retrieval of aerosol properties with GRASP code

摘要: Abstract The use of sky cameras for nocturnal aerosol characterization is discussed in this study. Two are configured to take High Dynamic Range (HDR) images at Granada and Valladolid (Spain). Some properties the cameras, like effective wavelengths, coordinates each pixel sensitivity, characterized. After that, normalized camera radiances lunar almucantar points (up 20° azimuth from Moon) obtained three wavelengths HDR images. These compared different case studies simulations fed with AERONET information, giving satisfactory results. uncertainty around 10% 533 nm 608 nm 14% 469 nm. Normalized six spectral optical depth values (obtained photometry) used as input GRASP code (Generalized Retrieval Aerosol Surface Properties) retrieve a dust episode over Valladolid. retrieved (refractive indices, fraction spherical particles size distribution parameters) agreement nearest diurnal products. calculated retrieval night time shows an increase coarse mode concentration along night, while fine remained constant.