Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing
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 h...
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American Geophysical Union
2001
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ftaemet:oai:repositorio.aemet.es:20.500.11765/2291 2024-06-23T07:55:16+00:00 Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing Díaz González, Juan Pedro Expósito González, Francisco Javier Torres, Carlos Herrera Cabello, Félix Prospero, Joseph M. Romero Palomino, María del Carmen 2001 application/pdf https://hdl.handle.net/20.500.11765/2291 eng eng American Geophysical Union https://dx.doi.org/10.1029/2001JD900020 Journal of Geophysical Research: Atmospheres. 2001, 106(D16), p. 18403–18416 2169-897X 2169-8996 http://hdl.handle.net/20.500.11765/2291 info:eu-repo/semantics/openAccess Aerosol optical depth Saharan dust Radiative forcing info:eu-repo/semantics/article 2001 ftaemet https://doi.org/20.500.11765/229110.1029/2001JD900020 2024-06-03T14:17:56Z 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. 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. Article in Journal/Newspaper North Atlantic ARCIMÍS (Archivo Climatológico y Meteorológico Institucional - AEMET, Agencia Estatal de Meteorología) Journal of Geophysical Research: Atmospheres 106 D16 18403 18416 |
institution |
Open Polar |
collection |
ARCIMÍS (Archivo Climatológico y Meteorológico Institucional - AEMET, Agencia Estatal de Meteorología) |
op_collection_id |
ftaemet |
language |
English |
topic |
Aerosol optical depth Saharan dust Radiative forcing |
spellingShingle |
Aerosol optical depth Saharan dust Radiative forcing Díaz González, Juan Pedro Expósito González, Francisco Javier Torres, Carlos Herrera Cabello, Félix Prospero, Joseph M. Romero Palomino, María del Carmen Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing |
topic_facet |
Aerosol optical depth Saharan dust Radiative forcing |
description |
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. 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. |
format |
Article in Journal/Newspaper |
author |
Díaz González, Juan Pedro Expósito González, Francisco Javier Torres, Carlos Herrera Cabello, Félix Prospero, Joseph M. Romero Palomino, María del Carmen |
author_facet |
Díaz González, Juan Pedro Expósito González, Francisco Javier Torres, Carlos Herrera Cabello, Félix Prospero, Joseph M. Romero Palomino, María del Carmen |
author_sort |
Díaz González, Juan Pedro |
title |
Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing |
title_short |
Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing |
title_full |
Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing |
title_fullStr |
Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing |
title_full_unstemmed |
Radiative properties of aerosols in Saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing |
title_sort |
radiative properties of aerosols in saharan dust outbreaks using ground-based and satellite data: applications to radiative forcing |
publisher |
American Geophysical Union |
publishDate |
2001 |
url |
https://hdl.handle.net/20.500.11765/2291 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://dx.doi.org/10.1029/2001JD900020 Journal of Geophysical Research: Atmospheres. 2001, 106(D16), p. 18403–18416 2169-897X 2169-8996 http://hdl.handle.net/20.500.11765/2291 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/20.500.11765/229110.1029/2001JD900020 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
106 |
container_issue |
D16 |
container_start_page |
18403 |
op_container_end_page |
18416 |
_version_ |
1802647778931769344 |