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The seasonal vertical distribution of the Saharan Air Layer and its modulation by the wind

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Tsamalis, C., Chédin, A., Pelon, J., Capelle, V.·2013·Atmospheric Chemistry and Physics
DOI 10.5194/acp-13-11235-2013

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Abstract

Abstract. The Saharan Air Layer (SAL) influences large-scale environment from western Africa to eastern tropical Americas, by carrying large amounts of dust aerosols. However, the vertical distribution of the SAL is not well established due to a lack of systematic measurements away from the continents. This can be overcome by using the observations of the spaceborne lidar CALIOP onboard the satellite CALIPSO. By taking advantage of CALIOP's capability to distinguish dust aerosols from other types of aerosols through depolarization, the seasonal vertical distribution of the SAL is analyzed at 1° horizontal resolution over a period of 5 yr (June 2006–May 2011). This study shows that SAL can be identified all year round displaying a clear seasonal cycle. It occurs higher in altitude and more northern in latitude during summer than during winter, but with similar latitudinal extent near Africa for the four seasons. The south border of the SAL is determined by the Intertropical Convergence Zone (ITCZ), which either prohibits dust layers from penetrating it or reduces significantly the number of dust layers seen within or south of it, as over the eastern tropical Atlantic. Spatially, near Africa, it is found between 5° S and 15° N in winter and 5–30° N in summer. Towards the Americas (50° W), SAL is observed between 5° S and 10° N in winter and 10–25° N in summer. During spring and fall, SAL is found between the position of winter and summer not only spatially but also vertically. In winter, SAL occurs in the altitude range 0–3 km off western Africa, decreasing to 0–2 km close to South America. During summer, SAL is found to be thicker and higher near Africa at 1–5 km, reducing to 0–2 km in the Gulf of Mexico, farther west than during the other seasons. SAL is confined to one layer, of which the mean altitude decreases with westward transport by 13 m deg−1 during winter and 28 m deg−1, after 30° W, during summer. Its mean geometrical thickness decreases by 25 m deg−1 in winter and 9 m deg−1 in summer. Spring and fall present similar characteristics for both mean altitude and geometrical thickness. Wind plays a major role not only for the transport of dust within the SAL but also by sculpting it. During winter, the trade winds transport SAL towards South America, while in spring and summer they bring dust-free maritime air masses mainly from the North Atlantic up to about 50° W below the SAL. The North Atlantic westerlies, with their southern border occurring between 15 and 30° N (depending on the season, the longitude and the altitude), prevent the SAL from developing further northward. In addition, their southward shift with altitude gives SAL its characteristic oval shape in the northern part. The effective dry deposition velocity of dust particles is estimated to be 0.07 cm s−1 in winter, 0.14 cm s−1 in spring, 0.2 cm s−1 in summer and 0.11 cm s−1 in fall. Finally, the African Easterly Jet (AEJ) is observed to collocate with the maximum dust load of the SAL, and this might promote the differential advection for SAL parts, especially during summer.

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  • From spring to summer, the dust plume shifts northward, linked to the shift of the ITCZ and the Harmattan winds into the Sahara and the development of the NW African monsoon.

    “From spring to summer, the dust plume shifts northward, linked to the shift of the Inter-Tropical Convergence Zone (ITCZ) and the Harmattan winds into the Sahara and the development of the NW African monsoon (Tsamalis et al., 2013).”

    From African desert dust influences migrations and fisheries of the Atlantic skipjack-tuna (2023) · cites this paper as Tsamalis et al., 2013

    Section 3.2 (Spring; page unavailable) reports a northward movement of the Saharan Air Layer, and Section 4.5 (page unavailable) connects its southern boundary to the ITCZ, which moves north over the Atlantic by summer. The cited passages do not link that movement to Harmattan winds moving into the Sahara or to development of the NW African monsoon. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Metadata

Authors
Tsamalis, C., Chédin, A., Pelon, J., & Capelle, V.
Affiliations
  • Met Office (GB)
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
  • Tsamalis, C.
  • Capelle, V.
ORCID
Venue
Atmospheric Chemistry and Physics
Publisher
Copernicus GmbH
Published
2013-11-19
Volume
13
Issue
22
Pages
11235-11257
ISSN
  • 1680-7316 (ISSN-L)
  • 1680-7324
DOI
10.5194/acp-13-11235-2013
OpenAlex
W2043190865
Cited by
142
References
1
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FWCI
6.61
Type
journal article
Language
en
Open access
Licence
Locations
  • Atmospheric chemistry and physics (publishedVersion, cc-by)
  • HAL (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
European Commission (283576)
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric aerosols and clouds
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric Ozone and Climate
Keywords
Saharan Air Layer, Saharan dust, dust aerosols, vertical distribution, seasonal cycle, CALIOP lidar, aerosol depolarization, Intertropical Convergence Zone, trade winds, wind transport, dust layer thickness, western equatorial Atlantic, eastern tropical Atlantic, eastern tropical Pacific, CALIPSO, CALIOP, aerosol optical depth, aerosol size distribution, aerosol hygroscopicity, aerosol mixing state, Saharan dust plumes

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