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Johannes Gutenberg-Universitat in Mainz (2008)

Airborne measurements of the spectral surface albedo over Morocco and its influence on the radiative forcing of Saharan dust

Bierwirth, Eike

Titre : Airborne measurements of the spectral surface albedo over Morocco and its influence on the radiative forcing of Saharan dust

Auteur : Bierwirth, Eike

Université de soutenance : Johannes Gutenberg-Universitat in Mainz

Grade : Doktor der Naturwissenschaften 2008

Résumé
This PhD thesis is embedded into the DFG research project SAMUM, the Saharan Mineral Dust Experiment which was initiated with the goal to investigate the optical and microphysical properties of Saharan dust aerosol, its transport, and its radiative effect. This work described the deployment of the Spectral Modular Airborne Radiation Measurement SysTem (SMART-Albedometer) in SAMUM after it has been extended in its spectral range. The SAMUM field campaign was conducted in May and June 2006 in south-eastern Morocco. At two ground stations and aboard two aircraft various measurements in an almost pure plume of Saharan dust were conducted. Airborne measurements of the spectral upwelling and downwelling irradiance are used to derive the spectral surface albedo in its typical range in the experiment region. Typical spectral types are presented and compared to the surface albedo derived from MISR satellite data. Furthermore, the radiative forcing of the observed Saharan dust is estimated in dependence on the surface albedo and its regional variations. A strong dependence of the radiative forcing not only on the surface albedo, but also on the optical properties of the dust aerosol is observed. It is unique to SAMUM that all these influential parameters have been measured in near-source Saharan dust, which made the calculations shown in this work possible.

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Page publiée le 16 octobre 2008, mise à jour le 12 janvier 2019