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Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing
Title: Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing
Authors: Díaz González, Juan PedroExpósito González, Francisco JavierTorres, Carlos ORCID RESEARCHERID Autor AEMETHerrera Cabello, FélixProspero, Joseph M.Romero Palomino, María del CarmenAutor AEMET
Keywords: Aerosol optical depth; Saharan dust; Radiative forcing
Issue Date: 2001
Publisher: American Geophysical Union
Citation: Journal of Geophysical Research: Atmospheres. 2001, 106(D16), p. 18403–18416
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Abstract: 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.
Sponsorship : 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.
ISSN: 2169-897X
Appears in Collections:Artículos científicos 2000-2004

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