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Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing
Título : Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing
Autor : Díaz González, Juan Pedro; Expósito, Francisco J.; Torres, Carlos J.; Herrera, Félix; Prospero, Joseph M.; Romero Palomino, María del Carmen
Palabras clave : Aerosol optical depth; Saharan dust; Radiative forcing
Fecha de publicación : 2001
Editor: American Geophysical Union
Citación : Journal of Geophysical Research: Atmospheres. 2001, 106(D16), p. 18403–18416
Versión del editor: https://dx.doi.org/10.1029/2001JD900020
Resumen : We report on measurements of atmospheric transmission (ATT) and aerosol optical depth (AODT) made at three wavelengths (368, 500, and 778 nm) with a spectroradiometer placed on Tenerife (28.5°N, 16.3°W), Canary Islands. Using the National Oceanic and Atmospheric Administration (NOAA) advanced very high resolution radiometer (AVHRR) channel 1, we also measured the aerosol optical depth (AODS) and albedo over a region of the North Atlantic Ocean extending from 15°–35°N to 12°–25°W. We observe large changes in ATT and AODT when dust outbreaks pass over this region. Using all these data, we derive the asymmetry factor (g), the single-scattering albedo (ω), and the local mean AODT and we compute the direct radiative forcing ΔF attributable to mineral dust. The local radiative forcing obtained is over the ocean ΔF = −9.7 W/m2 and for the land ΔF = −4.5 W/m2 with an error of ±25%. Extending these results to global-scale averages, we obtain values of ΔF of −1.22 W/m2 over the ocean and −0.57 W/m2 over land. The forcings attributable to dust are comparable in magnitude to those reported in the literature for anthropogenic sulphate and for biomass burning aerosols.
Patrocinador: We wish to thank the Gobierno Autónomo de Canarias for its financial support by contract 4/95, the Comisi6n Interministerial de Ciencia y Tecnologia (CICYT) by contract CLI97- 0453, and the University of La Laguna by contract 1802260003. A portion of this work was carried out as part of the Atmosphere/Ocean Chemistry Experiment (AEROCE) and supported by the National Science Foundation grants ATM-9414808, ATM-9414812, and ATM- 9414846.
URI : http://hdl.handle.net/20.500.11765/2291
ISSN : 2169-897X
2169-8996
Colecciones: Artículos científicos 2000-2004


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