Mineral Dust Entrainment and Deposition (DEAD) model: Description and 1990s dust climatology

17 ± 2 Tg; and optical depth at 0.63 mm, 0.030 ± 0.004. This emission, burden, and optical depth are significantly lower than some recent estimates. The model underestimates transport and deposition of East Asian and Australian dust to some regions of the Pacific Ocean. An underestimate of long-range transport of particles larger than 3 mm contributes to this bias. Our experiments support the hypothesis that dust emission ‘‘hot spots’’ exist in regions where alluvial sediments have accumulated and may be disturbed. INDEX TERMS: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801); 0322 Atmospheric Composition and Structure: Constituent sources and sinks; 4801 Oceanography: Biological and Chemical: Aerosols (0305); 5415 Planetology: Solid Surface Planets: Erosion and weathering; KEYWORDS: mineral dust aerosol, aerosol climatology, mineral deposition, aerosol scavenging, saltation sandblasting, ecosystem fertilization

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