Quantifying Mineral Dust Emissions on the Tibetan Plateau With a Modified Dust Source Map

The region surrounding the Tibetan Plateau (TP) is widely considered a primary global dust source, with mineral dust comprising a significant proportion of aerosols over the TP. Current research on TP dust has mainly focused on transport from the surrounding deserts, with little focus on dust emissions from the TP's interior. The erodibility factor used by the WRF-Chem (ERODDEF) is 0 for the TP, so the model cannot simulate the dust emissions inside the plateau. Thus, we constructed a high-resolution erodibility data set (ERODSDS) based on a reliable dust source distribution and intensity map. Based on the modified EROD map, the WRF-Chem model was used to simulate dust emissions and direct radiative forcing on the TP in 2018. With the modified EROD map, WRF-Chem can well simulate the temporal variation and spatial pattern of mineral dust on the plateau, which greatly improves the model's dust emissions simulation accuracy on the TP. Due to certain limitations of the ERODDEF, the previous WRF-Chem model was unable to accurately simulate dust emissions from the TP's interior. Thus, we constructed a more realistic ERODSDS and improved simulations of dust emissions and dust direct radiative forcing within the plateau. The west-central part of the plateau is also an important source of dust emissions, and the amount of dust emitted within the plateau should not be neglected. The WRF-Chem model seriously underestimates local dust emissions on the Tibetan PlateauHigh-precision erodibility data on the Tibetan Plateau is constructed to accurately describe the surface dust emission potentialThe temporal and spatial distribution of the local dust emission on the Tibetan Plateau was estimated