Mineral dust over west and central Sahel: Seasonal patterns of dry and wet deposition fluxes from a pluriannual sampling (2006–2012)

• DOI: 10.1002/2016jd025995
• Publication Date: 2016-12-25T04:49:57Z
• Authors: B. Marticorena; B. Chatenet; J. L. Rajot; G. Bergametti; A. Deroubaix; J. Vincent; A. Kouoi; C. Schmechtig; M. Coulibaly; A. Diallo; I. Koné; A. Maman; T. NDiaye; A. Zakou
• Keywords: Deposition; Mineral dust; Scavenging; Wet season; Dry season

Abstract Total and wet mineral dust deposition has been monitored since 2006 at three Sahelian stations in Senegal, Mali, Niger, respectively the weekly event time scale. Average annual deposited mass fluxes range from 75 to 183 g m −2 yr −1 , west east. Deposition exhibit a clear seasonal cycle Mali Niger. High result an optimum phasing between concentration precipitation: maximum occurring beginning of season, after before precipitation maximum. The contribution total varies 67% 8% Senegal. It is main factor variability year scale Niger Mali. Wet are mainly due wash out emitted by convective systems. In lower dominated dry (92% flux). This low occurrence systems producing local emissions intense deposition. primarily driven concentration. velocities derived our measurements consistent with those estimated theoretical models. Scavenging ratios computed measured fluxes, concentrations, anticorrelated amounts. suggests that most atmospheric scavenged very events.