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

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

Content Provider	Semantic Scholar
Author	Román, Roberto Torres, Benjamín Fuertes, David Cachorro, Victoria E. Dubovik, Oleg Toledano, Carlos Cazorla, Alberto Barreto, África Bosch, Juan L. Lapyonok, Tatjana González, Ramiro Goloub, Philippe Perrone, Maria Rita Olmo, Francisco José Frutos, Angel M. De Alados-Arboledas, Lucas
Copyright Year	2017
Abstract	Abstract The use of sky cameras for nocturnal aerosol characterization is discussed in this study. Two sky cameras are configured to take High Dynamic Range (HDR) images at Granada and Valladolid (Spain). Some properties of the cameras, like effective wavelengths, sky coordinates of each pixel and pixel sensitivity, are characterized. After that, normalized camera radiances at lunar almucantar points (up to 20° in azimuth from the Moon) are obtained at three effective wavelengths from the HDR images. These normalized radiances are compared in different case studies to simulations fed with AERONET aerosol information, giving satisfactory results. The obtained uncertainty of normalized camera radiances is around 10% at 533 nm and 608 nm and 14% for 469 nm. Normalized camera radiances and six spectral aerosol optical depth values (obtained from lunar photometry) are used as input in GRASP code (Generalized Retrieval of Aerosol and Surface Properties) to retrieve aerosol properties for a dust episode over Valladolid. The retrieved aerosol properties (refractive indices, fraction of spherical particles and size distribution parameters) are in agreement with the nearest diurnal AERONET products. The calculated GRASP retrieval at night time shows an increase in coarse mode concentration along the night, while fine mode properties remained constant.
Starting Page	238
Ending Page	252
Page Count	15
File Format	PDF HTM / HTML
DOI	10.1016/j.rse.2017.05.013
Alternate Webpage(s)	https://digibug.ugr.es/bitstream/handle/10481/48590/Roman_GRASPcode_Preprint.pdf?isAllowed=y&sequence=1
Alternate Webpage(s)	https://doi.org/10.1016/j.rse.2017.05.013
Volume Number	196
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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