Seasonal variations of the physical and optical characteristics of Saharan Dust: results from the Dust outflow and Deposition to the Ocean (DODO) experiment
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 Africa...
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2008
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ftunivreading:oai:centaur.reading.ac.uk:1249 2024-06-23T07:55:16+00:00 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. L. Highwood, E. J. Coe, H. Formenti, P. Anderson, B. Osborne, S. Nava, S. Desboeufs, K. Chen, G. Harrison, M. A. J. 2008 https://centaur.reading.ac.uk/1249/ https://doi.org/10.1029/2007JD009606 unknown American Geophysical Union McConnell, C. L. <https://centaur.reading.ac.uk/view/creators/90003685.html> orcid:0000-0002-9892-6113 , Highwood, E. J. <https://centaur.reading.ac.uk/view/creators/90000039.html>, Coe, H., Formenti, P., Anderson, B., Osborne, S., Nava, S., Desboeufs, K., Chen, G. and Harrison, M. A. J. (2008) Seasonal variations of the physical and optical characteristics of Saharan Dust: results from the Dust outflow and Deposition to the Ocean (DODO) experiment. Journal of Geophysical Research, 113. D14S05. ISSN 0148-0227 doi: https://doi.org/10.1029/2007JD009606 <https://doi.org/10.1029/2007JD009606> 551 Geology hydrology meteorology Article PeerReviewed 2008 ftunivreading https://doi.org/10.1029/2007JD009606 2024-06-11T14:41:45Z 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 CentAUR: Central Archive at the University of Reading Journal of Geophysical Research 113 D14 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
unknown |
topic |
551 Geology hydrology meteorology |
spellingShingle |
551 Geology hydrology meteorology McConnell, C. L. Highwood, E. J. Coe, H. Formenti, P. Anderson, B. Osborne, S. Nava, S. Desboeufs, K. Chen, G. Harrison, M. A. J. 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 |
551 Geology hydrology meteorology |
description |
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. |
format |
Article in Journal/Newspaper |
author |
McConnell, C. L. Highwood, E. J. Coe, H. Formenti, P. Anderson, B. Osborne, S. Nava, S. Desboeufs, K. Chen, G. Harrison, M. A. J. |
author_facet |
McConnell, C. L. Highwood, E. J. Coe, H. Formenti, P. Anderson, B. Osborne, S. Nava, S. Desboeufs, K. Chen, G. Harrison, M. A. J. |
author_sort |
McConnell, C. L. |
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 |
American Geophysical Union |
publishDate |
2008 |
url |
https://centaur.reading.ac.uk/1249/ https://doi.org/10.1029/2007JD009606 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
McConnell, C. L. <https://centaur.reading.ac.uk/view/creators/90003685.html> orcid:0000-0002-9892-6113 , Highwood, E. J. <https://centaur.reading.ac.uk/view/creators/90000039.html>, Coe, H., Formenti, P., Anderson, B., Osborne, S., Nava, S., Desboeufs, K., Chen, G. and Harrison, M. A. J. (2008) Seasonal variations of the physical and optical characteristics of Saharan Dust: results from the Dust outflow and Deposition to the Ocean (DODO) experiment. Journal of Geophysical Research, 113. D14S05. ISSN 0148-0227 doi: https://doi.org/10.1029/2007JD009606 <https://doi.org/10.1029/2007JD009606> |
op_doi |
https://doi.org/10.1029/2007JD009606 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
D14 |
_version_ |
1802647776193937408 |