In the Northern Hemisphere hosting deserts and erodible soils (e.g., GoudieĪnd Middleton, 2006) that are prone to windblown dust. The major sources ofĭust are situated across the “dust belt” (Prospero et al., 2002) stretching The assessment of the dust-related impacts within the Earth–atmosphere system.ĭust is the most prominent contributor to the global aerosol burden in terms of dry mass, and it ranks second in aerosol emissions (Gliß etĪl., 2021 Huneeus et al., 2011 Textor et al., 2006). Parameterization schemes of the dust life-cycle components towards improving The current study highlights the necessity of upgrading the existing model Representation of the vertical structure of the dust layers as those areĬaptured by the CALIPSO-LIVAS vertically resolved pure dust observations. Moreover, the UR80 experiment improves the The overall statisticalĪnalysis indicates that the best agreement with airborne in situ measurements downwind (Cabo Verde) is achieved with a 40 % reduction in settling velocity (UR40). Reduction in settling velocity (UR60) scenario. Our simulations reveal that particles with diameters of 5.5–17 andĤ0–100 µm are better represented under the assumption of an 80 % reduction in the settling velocity (UR80), while particles with sizes ranging between 17 and 40 µm are better represented in a 60 % Settling velocities in order to compensate underrepresented mechanisms, suchĪs the non-spherical aerodynamics, in the relevant parameterization schemes. Sensitivity runs are performed by reducing artificially the particles' The results show that the modeled lifetimes of the coarser particles are shorter than those observed. Model results are evaluated against airborne dust measurementsĪnd the CALIPSO-LIVAS pure dust product. The new code wasĪpplied to simulate dust transport over Cabo Verde in August 2015 (AER-D campaign). The initial particle sizeĭistribution is constrained by observations over desert dust sources.įurthermore, the Stokes drag coefficient has been updated to account for realistic dust particle sizes ( Re < 10 5). Mechanisms which hamper the model in reproducing adequately the transport of GOCART-AFWA dust scheme of WRFV4.2.1 to also include such coarse and giant particles, and we further discuss the underlying misrepresented physical Work, we modify the parameterization of the mineral dust cycle in the Regularly observed to remain airborne during long-range transport. Dust particles larger than 20 µm in diameter have been
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