У четвртак, 21. августа 2025. године у 12 часова у сали „Звонко Марић“ Института за физику у Београду, др Лука Илић (Суперрачунарски центар у Барселони, Шпанија) одржаће предавање:
Impact of Dust Mineralogy Representation on Modeled Optical Properties and Radiative Effects Using MONARCH
САЖЕТАК:
Mineral dust from arid regions is a major contributor to the global aerosol burden and a key source of uncertainty in weather and climate models due to its radiative effects. These effects, particularly in the shortwave, depend strongly on particle size and mineral composition, especially the presence of iron oxide–carrying minerals. Many global dust models assume fixed or homogeneous source mineralogy, often neglecting size-dependent variability. This is further complicated by uncertainties in source datasets and the computational cost of explicit composition modeling.
We use the MONARCH (Multiscale Online Non-hydrostatic AtmospheRe CHemistry) model, coupled with RRTMG, to simulate global dust transport and radiative effects under different mineralogical assumptions. MONARCH resolves individual mineral tracers and uses the Maxwell-Garnett approach to compute optical properties of host particles with iron oxide inclusions. The set of numerical experiments covers varying mineralogy assumptions and a set of soil mineralogy atlases, including the new high-resolution EMIT product. Results from one-year simulations show that explicit mineralogy introduces more variability in single scattering albedo (SSA). Differences in assumptions lead to differences in estimates in regional and global direct radiative effect (DRE).