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The Direct Effect of Aerosols on Solar Radiation Over the Broader Mediterranean Basin : Volume 11, Issue 11 (08/11/2011)

By Papadimas, C. D.

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Book Id: WPLBN0003995737
Format Type: PDF Article :
File Size: Pages 43
Reproduction Date: 2015

Title: The Direct Effect of Aerosols on Solar Radiation Over the Broader Mediterranean Basin : Volume 11, Issue 11 (08/11/2011)  
Author: Papadimas, C. D.
Volume: Vol. 11, Issue 11
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Hatzianastassiou, N., Papadimas, C. D., Vardavas, I., Kanakidou, M., Mihalopoulos, N., & Matsoukas, C. (2011). The Direct Effect of Aerosols on Solar Radiation Over the Broader Mediterranean Basin : Volume 11, Issue 11 (08/11/2011). Retrieved from

Description: Laboratory of Meteorology, Department of Physics, University of Ioannina, 45110 Ioannina, Greece. For the first time, the direct radiative effect (DRE) of aerosols on solar radiation is computed over the entire Mediterranean basin, one of the most climatically sensitive world regions, by using a deterministic spectral radiation transfer model (RTM). The DRE effects on the outgoing shortwave radiation at the top of atmosphere (TOA), DRETOA, on the absorption of solar radiation in the atmospheric column, DREatm, and on the downward and absorbed surface solar radiation (SSR), DREsurf and DREnetsurf, respectively, are computed separately. The model uses input data for the period 2000–2007 for various surface and atmospheric parameters, taken from satellite (International Satellite Cloud Climatology Project, ISCCP-D2), Global Reanalysis projects (National Centers for Environmental Prediction – National Center for Atmospheric Research, NCEP/NCAR), and other global databases. The spectral aerosol optical properties (aerosol optical depth, AOD, asymmetry parameter, gaer and single scattering albedo, Ωaer), are taken from the MODerate resolution Imaging Spectroradiometer (MODIS) of NASA (National Aeronautics and Space Administration) and they are Supplemented by the Global Aerosol Data Set (GADS). The model SSR fluxes have been successfully validated against measurements from 80 surface stations of the Global Energy Balance Archive (GEBA) covering the period 2000–2007. A planetary cooling is found above the Mediterranean on an annual basis (regional mean DRETOA = −2.4 Wm−2). Though planetary cooling is found over most of the region, up to −7 Wm−2, large positive DRETOA values (up to +25 Wm−2) are found over North Africa, indicating a strong planetary warming, as well as over the Alps (+0.5 Wm−2). Aerosols are found to increase the absorption of solar radiation in the atmospheric column over the region (DREatm = +11.1 Wm−2) and to decrease SSR (DREsurf = −16.5 Wm−2 and DREnetsurf −13.5 Wm−2) inducing thus significant atmospheric warming and surface radiative cooling. The calculated seasonal and monthly DREs are even larger, reaching −25.4 Wm−2 (for DREsurf). Sensitivity tests show that regional DREs are most sensitive to Ωaer and secondarily to AOD, showing a quasi-linear dependence to these aerosol parameters.

The direct effect of aerosols on solar radiation over the broader Mediterranean basin

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