Seasonal variations of the physical and optical characteristics of Saharan dust: Results from the Dust Outflow and Deposition to the Ocean (DODO) experiment
International audience North African dust is important for climate through its direct radiative effect on solar and terrestrial radiation and its role in the biogeochemical system. The Dust Outflow and Deposition to the Ocean project (DODO) aimed to characterize the physical and optical properties o...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | https://hal.science/hal-04254149 https://hal.science/hal-04254149/document https://hal.science/hal-04254149/file/ark%20_67375_WNG-MJ3C867F-R.pdf https://doi.org/10.1029/2007JD009606 |
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ftccsdartic:oai:HAL:hal-04254149v1 2023-12-31T10:20:51+01:00 Seasonal variations of the physical and optical characteristics of Saharan dust: Results from the Dust Outflow and Deposition to the Ocean (DODO) experiment Mcconnell, C. Highwood, E. Coe, H. Formenti, P. Anderson, B. Osborne, S. Nava, S. Desboeufs, K. Chen, G. Harrison, M. Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) 2008-07-27 https://hal.science/hal-04254149 https://hal.science/hal-04254149/document https://hal.science/hal-04254149/file/ark%20_67375_WNG-MJ3C867F-R.pdf https://doi.org/10.1029/2007JD009606 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JD009606 hal-04254149 https://hal.science/hal-04254149 https://hal.science/hal-04254149/document https://hal.science/hal-04254149/file/ark%20_67375_WNG-MJ3C867F-R.pdf doi:10.1029/2007JD009606 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.science/hal-04254149 Journal of Geophysical Research: Atmospheres, 2008, 113 (D14), ⟨10.1029/2007JD009606⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2008 ftccsdartic https://doi.org/10.1029/2007JD009606 2023-12-02T23:38:43Z International audience North African dust is important for climate through its direct radiative effect on solar and terrestrial radiation and its role in the biogeochemical system. The Dust Outflow and Deposition to the Ocean project (DODO) aimed to characterize the physical and optical properties of airborne North African dust in two seasons and to use these observations to constrain model simulations, with the ultimate aim of being able to quantify the deposition of iron to the North Atlantic Ocean. The in situ properties of dust from airborne campaigns measured during February and August 2006, based at Dakar, Senegal, are presented here. Average values of the single scattering albedo (0.99, 0.98), mass specific extinction (0.85 m 2 g −1 , 1.14 m 2 g −1 ), asymmetry parameter (0.68, 0.68), and refractive index (1.53–0.0005i, 1.53–0.0014i) for the accumulation mode were found to differ by varying degrees between the dry and wet season, respectively. It is hypothesized that these differences are due to different source regions and transport processes which also differ between the DODO campaigns. Elemental ratios of Ca/Al were found to differ between the dry and wet season (1.1 and 0.5, respectively). Differences in vertical profiles are found between seasons and between land and ocean locations and reflect the different dynamics of the seasons. Using measurements of the coarse mode size distribution and illustrative Mie calculations, the optical properties are found to be very sensitive to the presence and amount of coarse mode of mineral dust, and the importance of accurate measurements of the coarse mode of dust is highlighted. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Geophysical Research: Atmospheres 113 D14 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Mcconnell, C. Highwood, E. Coe, H. Formenti, P. Anderson, B. Osborne, S. Nava, S. Desboeufs, K. Chen, G. Harrison, M. Seasonal variations of the physical and optical characteristics of Saharan dust: Results from the Dust Outflow and Deposition to the Ocean (DODO) experiment |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience North African dust is important for climate through its direct radiative effect on solar and terrestrial radiation and its role in the biogeochemical system. The Dust Outflow and Deposition to the Ocean project (DODO) aimed to characterize the physical and optical properties of airborne North African dust in two seasons and to use these observations to constrain model simulations, with the ultimate aim of being able to quantify the deposition of iron to the North Atlantic Ocean. The in situ properties of dust from airborne campaigns measured during February and August 2006, based at Dakar, Senegal, are presented here. Average values of the single scattering albedo (0.99, 0.98), mass specific extinction (0.85 m 2 g −1 , 1.14 m 2 g −1 ), asymmetry parameter (0.68, 0.68), and refractive index (1.53–0.0005i, 1.53–0.0014i) for the accumulation mode were found to differ by varying degrees between the dry and wet season, respectively. It is hypothesized that these differences are due to different source regions and transport processes which also differ between the DODO campaigns. Elemental ratios of Ca/Al were found to differ between the dry and wet season (1.1 and 0.5, respectively). Differences in vertical profiles are found between seasons and between land and ocean locations and reflect the different dynamics of the seasons. Using measurements of the coarse mode size distribution and illustrative Mie calculations, the optical properties are found to be very sensitive to the presence and amount of coarse mode of mineral dust, and the importance of accurate measurements of the coarse mode of dust is highlighted. |
author2 |
Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Article in Journal/Newspaper |
author |
Mcconnell, C. Highwood, E. Coe, H. Formenti, P. Anderson, B. Osborne, S. Nava, S. Desboeufs, K. Chen, G. Harrison, M. |
author_facet |
Mcconnell, C. Highwood, E. Coe, H. Formenti, P. Anderson, B. Osborne, S. Nava, S. Desboeufs, K. Chen, G. Harrison, M. |
author_sort |
Mcconnell, C. |
title |
Seasonal variations of the physical and optical characteristics of Saharan dust: Results from the Dust Outflow and Deposition to the Ocean (DODO) experiment |
title_short |
Seasonal variations of the physical and optical characteristics of Saharan dust: Results from the Dust Outflow and Deposition to the Ocean (DODO) experiment |
title_full |
Seasonal variations of the physical and optical characteristics of Saharan dust: Results from the Dust Outflow and Deposition to the Ocean (DODO) experiment |
title_fullStr |
Seasonal variations of the physical and optical characteristics of Saharan dust: Results from the Dust Outflow and Deposition to the Ocean (DODO) experiment |
title_full_unstemmed |
Seasonal variations of the physical and optical characteristics of Saharan dust: Results from the Dust Outflow and Deposition to the Ocean (DODO) experiment |
title_sort |
seasonal variations of the physical and optical characteristics of saharan dust: results from the dust outflow and deposition to the ocean (dodo) experiment |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-04254149 https://hal.science/hal-04254149/document https://hal.science/hal-04254149/file/ark%20_67375_WNG-MJ3C867F-R.pdf https://doi.org/10.1029/2007JD009606 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.science/hal-04254149 Journal of Geophysical Research: Atmospheres, 2008, 113 (D14), ⟨10.1029/2007JD009606⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JD009606 hal-04254149 https://hal.science/hal-04254149 https://hal.science/hal-04254149/document https://hal.science/hal-04254149/file/ark%20_67375_WNG-MJ3C867F-R.pdf doi:10.1029/2007JD009606 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2007JD009606 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
113 |
container_issue |
D14 |
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1786831412753596416 |