Major element signatures of silicate dust ...
Document type :
Compte-rendu et recension critique d'ouvrage
DOI :
Permalink :
Title :
Major element signatures of silicate dust deposited on the West African margin: links with transport patterns and provenance regions
Author(s) :
Le Quilleuc, Meryll [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bory, Aloys [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Philippe, Sylvie [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Derimian, Yevgeny [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Skonieczny, Charlotte [Auteur]
Géosciences Paris Saclay [GEOPS]
Petit, Jean‐eudes [Auteur]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Ponlevé, Déborah [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Diallo, Aboubacry [Auteur]
Ndiaye, Thierno [Auteur]
Alaimo, Véronique [Auteur]
Quentin, Louis [Auteur]
Tribovillard, Nicolas [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bout Roumazeilles, Viviane [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bory, Aloys [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Philippe, Sylvie [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Derimian, Yevgeny [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Skonieczny, Charlotte [Auteur]
Géosciences Paris Saclay [GEOPS]
Petit, Jean‐eudes [Auteur]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Ponlevé, Déborah [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Diallo, Aboubacry [Auteur]
Ndiaye, Thierno [Auteur]
Alaimo, Véronique [Auteur]
Quentin, Louis [Auteur]
Tribovillard, Nicolas [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bout Roumazeilles, Viviane [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Journal title :
Journal of Geophysical Research: Atmospheres
Pages :
e2021JD035030
Publisher :
American Geophysical Union
Publication date :
2021-10-27
ISSN :
2169-897X
English keyword(s) :
Saharan dust
deposition flux
major elements
Senegal
Tropical Atlantic Ocean
back trajectography
dust sources
Tanezrouft desert
deposition flux
major elements
Senegal
Tropical Atlantic Ocean
back trajectography
dust sources
Tanezrouft desert
HAL domain(s) :
Physique [physics]
Planète et Univers [physics]
Sciences du Vivant [q-bio]
Planète et Univers [physics]
Sciences du Vivant [q-bio]
English abstract : [en]
Mineral dust deposition characteristics are poorly constrained, even in the Northeastern Tropical Atlantic Ocean, which is immediately downwind of the Saharan desert and the largest marine repository of aeolian dust in the ...
Show more >Mineral dust deposition characteristics are poorly constrained, even in the Northeastern Tropical Atlantic Ocean, which is immediately downwind of the Saharan desert and the largest marine repository of aeolian dust in the world. Here, we report on a 2-year (March 2013–February 2015) time series of deposited dust on the Senegalese margin. This record enables us to document the chemical variability (major elements) of the settling Saharan dust (<30 µm silicate fraction, i.e., carbonate-free) at a resolution varying from one week to one day, along with the deposition flux. This continuous time series reveals a greater geochemical diversity than previously reported, particularly during the dry winter-spring season when continental trade winds sweep across vast regions of West Africa at low atmospheric levels before reaching the sampling site. By contrast, during major deposition events, which make up for most of the yearly flux, our record shows that Saharan dust chemical composition displays much narrower ranges. Trajectory analyses indicate that these relatively well-defined chemical signatures are due to the limited number of provenance sectors involved during major deposition occurrences. The chemical characterization of the dust deposited during these events, hence, allows identifying the major element fingerprint of the related source regions, the most important one being a sizable area at the border of Algeria and Mali including the Tanezrouft desert north of the Taoudeni basin. Also, since these major events are associated with major Saharan outbreaks, they provide estimations of the prevailing elemental signatures for Saharan dust impacting the Northeastern Tropical Atlantic Ocean.Show less >
Show more >Mineral dust deposition characteristics are poorly constrained, even in the Northeastern Tropical Atlantic Ocean, which is immediately downwind of the Saharan desert and the largest marine repository of aeolian dust in the world. Here, we report on a 2-year (March 2013–February 2015) time series of deposited dust on the Senegalese margin. This record enables us to document the chemical variability (major elements) of the settling Saharan dust (<30 µm silicate fraction, i.e., carbonate-free) at a resolution varying from one week to one day, along with the deposition flux. This continuous time series reveals a greater geochemical diversity than previously reported, particularly during the dry winter-spring season when continental trade winds sweep across vast regions of West Africa at low atmospheric levels before reaching the sampling site. By contrast, during major deposition events, which make up for most of the yearly flux, our record shows that Saharan dust chemical composition displays much narrower ranges. Trajectory analyses indicate that these relatively well-defined chemical signatures are due to the limited number of provenance sectors involved during major deposition occurrences. The chemical characterization of the dust deposited during these events, hence, allows identifying the major element fingerprint of the related source regions, the most important one being a sizable area at the border of Algeria and Mali including the Tanezrouft desert north of the Taoudeni basin. Also, since these major events are associated with major Saharan outbreaks, they provide estimations of the prevailing elemental signatures for Saharan dust impacting the Northeastern Tropical Atlantic Ocean.Show less >
Language :
Anglais
Popular science :
Non
ANR Project :
Collections :
Submission date :
2024-04-16T14:14:39Z
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