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Universidad de Granada (2013)

AFRICAN DESERT DUST EVENTS IMPACT OVER SOUTHEASTERN SPAIN (2005-2010) : AEROSOL RADIATIVE PROPERTIES AND FORCING

GUTIÉRREZ Antonio Valenzuela

Titre : AFRICAN DESERT DUST EVENTS IMPACT OVER SOUTHEASTERN SPAIN (2005-2010) : AEROSOL RADIATIVE PROPERTIES AND FORCING

Auteur : GUTIÉRREZ Antonio Valenzuela

Université de soutenance : Universidad de Granada

Grade : Doctorado en Fisica y Ciencias del Espacio (2013)

Résumé partiel
The aim of this PhD thesis is to analyze the radiative properties of the atmospheric aerosol during the African dust events registered at Granada from 2005 to 2010, as well as their influence on radiative forcing both at the surface and at the top of the atmosphere (TOA). To accomplish this goal we have used mainly the measurements made with a sun-photometer. In contrast to measurements performed by in-situ or chemical analysis, the advantage of this remote sensing technique is the no modification of the aerosol properties during the measurement process. The sun-photometer used is included in the AERONET network (AErosol RObotic NETwork), sponsored by NASA, and operated continuously in radiometric station located at CEAMA (Andalusian Center of Environment) as part of the instrumentation used by the Atmospheric Physic Group of the University of Granada (GFAT). Major advances presented in this work are related to the implementation and application of a new methodology for deriving optical and microphysical properties of the aerosol in the atmospheric column using sky radiance in the principal plane configuration, and considering, from a methodological point of view, that the particles are not spherical. The following paragraphs summarize briefly the main specific objectives discussed in this work. After the introduction, where we show the relevance of the PhD thesis ; in next chapters, the radiometric magnitudes and the procedure for deriving the Radiative Transfer Equation (ETR) used in the Earth’s atmosphere studies are defined. In addition, the atmospheric aerosol and its possible classification by sources, the chemical composition and size distribution are described in detail. From instrumental point of view, the sun-photometer CIMEL, the methodology for measurements and its calibration processes are also detailed. Finally, other instruments used in this PhD thesis are also briefly described. In the Methodology Section, a detailed description of the procedure to derive the aerosol optical depth is included, besides the algorithm used for ETR inversion using the sky radiance measurements in principal plane configuration and taking into account the non sphericity of particles. Also, we analyzed the sensitivity of the inversion algorithm and the atmospheric aerosol properties obtained with those provided by the AERONET network. Additionally, the quality control procedure of the experimental data, the criteria used for the selection of days with African dust events affecting our radiometric station, and the methodology used to derive the radiative forcing at surface and TOA are also described in detail.

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Page publiée le 10 juillet 2014, mise à jour le 10 février 2019