Atmos. Chem. Phys. Discuss., 8, 16061-16096, 2008
www.atmos-chem-phys-discuss.net/8/16061/2008/
doi:10.5194/acpd-8-16061-2008
© Author(s) 2008. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Saharan dust transport and deposition towards the Tropical Northern Atlantic
K. Schepanski1,2, I. Tegen1, and A. Macke2
1Leibniz Institute for Tropospheric Research, Leipzig, Germany
2Leibniz-Institute of Marine Sciences, IFM-GEOMAR, Kiel, Germany

Abstract. We present a study of Saharan dust export towards the tropical North Atlantic using the regional dust emission, transport and deposition model LM-MUSCAT. Horizontal and vertical distribution of dust optical thickness, concentration, and dry and wet deposition rates are used to describe seasonality of dust export and deposition towards the eastern Atlantic for three exemplary months in different seasons. Deposition rates strongly depend on the vertical dust distribution, which differs with seasons. Furthermore the contribution of dust originating from the Bodélé Depression to Saharan dust over the Atlantic is investigated. A maximum contribution of Bodélé dust transported towards the Cape Verde Islands is evident in winter when the Bodélé source area is most active and dominant with regard activation frequency and dust emission. Limitations of using satellite retrievals to estimate dust deposition are highlighted.

Citation: Schepanski, K., Tegen, I., and Macke, A.: Saharan dust transport and deposition towards the Tropical Northern Atlantic, Atmos. Chem. Phys. Discuss., 8, 16061-16096, doi:10.5194/acpd-8-16061-2008, 2008.
 
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