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- W2065488118 abstract "A pall of aerosols and trace gases frequently occurs over southern Africa to a depth of ∼500 hPa, blanketing vast areas, particularly in the austral winter and spring. Large-scale offshore transport of these aerosols and trace gases in extremely large plumes from interior continental areas of the subcontinent to the Indian and Atlantic Oceans is a common occurrence. The nature of the transport plumes, their climatology, chemical composition and morphology are discussed. In the vertically integrated, surface-to-500 hPa layer, poleward of about 15° S, transport into the Indian Ocean is shown to be about 60% greater into the Indian Ocean than into the Atlantic Ocean. Recirculation of atmospheric constituents is considered and estimates of aerosol mass fluxes over central southern Africa are presented. Of the total of about 50 Mt yr-1 of aerosols being transported at the central meridian, 44% is shown to be recirculated material. The rest exits the subcontinent directly without recirculation. Preferred plume corridors of exit and entry are postulated for different localities on the east and west coasts. Two case studies of east- and west-coast plumes apparently flowing uniformly out of southern Africa are examined. The illusion of uniformity in plume structure is shown to be misleading. Both plumes are shown to be above and separated from the marine boundary layer. Each is over 1500 km in width and 3–5 km deep. Likewise, both are capped by absolutely stable layers at ∼500 hPa and exhibit a complex structure of both outflowing aerosols and trace gases and inflowing, recycled and recirculated material. Indications of the composition of the recirculated material are given and implications of the plume transports are considered." @default.
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- W2065488118 date "1998-05-01" @default.
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- W2065488118 title "Transport and recirculation of aerosols off Southern Africa—macroscale plume structure" @default.
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- W2065488118 doi "https://doi.org/10.1016/s1352-2310(97)00392-0" @default.
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