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Estimation de la Quantité de Vapeur d'Eau Précipitable et du Forçage Radiatif de l'Aérosol atmosphérique à partir de la Télédétection passive à Oujda (Maroc)

Abstract : The atmospheric aerosol is key parameter in the climatic machine, it contribute in a significant way to the extinction of the radiation within the atmosphere by the processes of absorption and scattering. These processes can be quantified under term of direct radiative forcing; the determination of this forcing remains incertaine at the present time on the global and regional scale. This work contributes to the estimate of aerosol radiative forcing on a regional scale, this quantification is made with a method based on measurements of solar radiance using the pyranometer (spectrum of the radiation), and also by the Sunphotometer as optical thickness (measurements for precise wavelengths). All these measurements are taken with the university campus of the Faculty of Science of Oujda (34°41' NR; 1°53' W; 580 m of altitude).
The atmospheric aerosol contributes to a cooling of surface of about -10 W/m² on average annual, with very important variations. The radiative forcing can reach extremely high values for the days charged with dust (- 80 W/m² ). The aerosol of the accumulation mode is the principal responsable for radiative forcing with a weak contribution of the large particles.
The Water vapor is a principal component in the formation of the clouds and precipitations. The determination of the Amount of Precipitable Water Vapor (QVEP) remains a very important objective, the knowledge of its distribution spatial and temporal is essential in the correction of measurements of remote sensing because of its important contribution in the perturbation of the signal measured by the instruments of remote sensing. Measurements of solar transmittance in the infra-red bands of strong absorption of the water vapor allow the determination of this QVEP. The amount of water vapor in the area of Oujda depends on the seasons, the hight values in oujda is about 2.5 g/cm² are recorded during the summer and spring and the low values around 0.3 g/cm² in autumn and winter. These variations depend on the temperature and surface water.
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Submitted on : Saturday, January 27, 2007 - 1:55:40 PM
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El Aouadi Ibrahim. Estimation de la Quantité de Vapeur d'Eau Précipitable et du Forçage Radiatif de l'Aérosol atmosphérique à partir de la Télédétection passive à Oujda (Maroc). Climatologie. Faculté des Sciences d'Oujda, 2005. Français. ⟨tel-00126997⟩

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