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Aerosol radiative effects in the ultraviolet, visible, and near-infrared spectral ranges using long-term aerosol data series over the Iberian Peninsula
Mateos, D; Anton, M; Toledano, C.; Cachorro, V.; Alados Arboledas, Lucas; Sorribas, M.; Costa, M. J.; Baldasano Recio, José María
Universitat Politècnica de Catalunya. Departament de Projectes d'Enginyeria; Universitat Politècnica de Catalunya. MTA - Modelització i Tecnologia Ambiental
A better understanding of aerosol radiative properties is a crucial challenge for climate change studies. This study aims at providing a complete characterization of aerosol radiative effects in different spectral ranges within the shortwave (SW) solar spectrum. For this purpose, long-term data sets of aerosol properties from six AERONET stations located in the Iberian Peninsula (southwestern Europe) have been analyzed in terms of climatological characterization and inter-annual changes. Aerosol information was used as input for the libRadtran model in order to determine the aerosol radiative effect (ARE) at the surface in the ultraviolet (ARE(UV)), visible (ARE(VIS)), near-infrared (ARE(NIR)), and the entire SW range (ARE(SW)) under cloud-free conditions. Over the whole Iberian Peninsula, yearly aerosol radiative effects in the different spectral ranges were found to be -1.1 < ARE(UV) < -0.7, -5.7 < ARE(VIS) < -3.5, -2.6 < ARE(NIR) < -1.6, and -8.8 < ARE(SW) < -5.7 (in Wm 2). Monthly means of ARE showed a seasonal pattern with larger values in spring and summer. The aerosol forcing efficiency (AFE), ARE per unit of aerosol optical depth, has also been evaluated in the four spectral ranges. AFE exhibited a dependence on single scattering albedo as well as a weaker one on the Angstrom exponent. AFE is larger (in absolute value) for small and absorbing particles. The contributions of the UV, VIS, and NIR ranges to the SW efficiency varied with the aerosol types. The predominant aerosol size determined the fractions AFE(VIS)/AFE(SW) and AFE(NIR)/AFE(SW). The AFE(VIS) was the dominant contributor for all aerosol types, although non-absorbing large particles caused more even contribution of VIS and NIR intervals. The AFE(UV)/AFE(SW) ratio showed a higher value in the case of absorbing fine particles.
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament d'emissions i olors
Solar radiation -- Measurement
Atmospheric aerosols -- Measurement
Mineral dust
Air -- Pollution -- Computer methods
SOLAR IRRADIANCE MEASUREMENTS
SKY RADIANCE MEASUREMENTS
SOUTHEASTERN SPAIN
OPTICAL-PROPERTIES
SAHARAN DUST
ANGSTROM EXPONENT
SOFTWARE PACKAGE
TRENDS
SITE
SURFACE
Radiació solar -- Mesurament
Aerosols atmosfèrics -- Mesurament
Pols mineral
Aire -- Contaminació -- Simulació per ordinador
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
Artículo
         

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