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This paper presents radiative transfer calculations performed over Niamey inthe UV-Visible range over the period 26th January–1st February 2006during the African Multidisciplinary Monsoon Analysis (AMMA) internationalprogram. Climatic effects of aerosols along the vertical column haverequired an accurate determination of their optical properties, which arepresented here for a variety of instrumented platforms: Ultralight aircraft,Facility for Airborne Atmospheric Measurements (FAAM) research aircraft,AERONET station. Measurements highlighted the presence of a multi-layeredstructure of mineral dust located below and biomass-burning particles in themore elevated layers. Radiative forcing was affected by both the scatteringand absorption effects governed by the aerosol complex refractive index(ACRI). The best agreement between our results and AERONET opticalthicknesses, ground-based extinction measurements and NO2 photolysisrate coefficient was found using the synergy between all the instrumentedplatforms. The corresponding averaged ACRI at 355 nm were 1.53 (±0.04)−0.047i (±0.006) and 1.52 (±0.04) −0.008i (±0.001) forbiomass-burning and mineral dust aerosols, respectively. Biomass-burningaerosols were characterized by single-scattering albedo ranging from 0.78 to0.82 and asymmetry parameter ranging from 0.71 to 0.73. For dust aerosols,single-scattering albedo (asymmetry parameter) ranged from 0.9 to 0.92 (0.73to 0.75). The solar energy depletion at the surface is shown to be ~−21.2(±1.7) W/m2 as a daily average. At the TOA, the radiativeforcing appeared slightly negative but very close to zero (~−1.4 W/m2).The corresponding atmospheric radiative forcing was found to be~19.8 (±2.3) W/m2. Mineral dust located below a moreabsorbing layer act as an increase in surface reflectivity of ~3–4%.The radiative forcing is also shown to be highly sensitive tothe optical features of the different aerosol layers (ACRI, opticalthickness and aerosol vertical distribution)

Radiative budget in the presence of multi-layered aerosol structures in the framework of AMMA SOP-0