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• W4283589141 abstract "Abstract Quantification of dust aerosols in Earth System Models (ESMs) has important implications for water cycle and biogeochemistry studies. This study examines the global life cycle and direct radiative effects (DREs) of dust in the U.S. Department of Energy's Energy Exascale Earth System Model version 1 (E3SMv1), and the impact of increasing model resolution both horizontally and vertically. The default 1° E3SMv1 captures the spatial and temporal variability in the observed dust aerosol optical depth (DAOD) reasonably well, but overpredicts dust absorption in the shortwave (SW). Simulations underestimate the dust vertical and long‐range transport, compared with the satellite dust extinction profiles. After updating dust refractive indices and correcting for a bias in partitioning size‐segregated emissions, both SW cooling and longwave (LW) warming of dust simulated by E3SMv1 are increased and agree better with other recent studies. The estimated net dust DRE of −0.42 Wm −2 represents a stronger cooling effect than the observationally based estimate −0.2 Wm −2 (−0.48 to +0.2), due to a smaller LW warming. Constrained by a global mean DAOD, model sensitivity studies of increasing horizontal and vertical resolution show strong influences on the simulated global dust burden and lifetime primarily through the change of dust dry deposition rate; there are also remarkable differences in simulated spatial distributions of DAOD, DRE, and deposition fluxes. Thus, constraining the global DAOD is insufficient for accurate representation of dust climate effects, especially in transitioning to higher‐ or variable‐resolution ESMs. Better observational constraints of dust vertical profiles, dry deposition, size, and LW properties are needed." @default.
• W4283589141 created "2022-06-28" @default.
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• W4283589141 date "2022-07-01" @default.
• W4283589141 modified "2023-10-11" @default.
• W4283589141 title "Global Dust Cycle and Direct Radiative Effect in E3SM Version 1: Impact of Increasing Model Resolution" @default.
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• W4283589141 doi "https://doi.org/10.1029/2021ms002909" @default.
• W4283589141 hasPublicationYear "2022" @default.
• W4283589141 type Work @default.
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