A007-0015
Coarse dust aerosol radiative effect in the IMPACT model

Monday, 7 December 2020
Poster
Akinori Ito, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, Adeyemi A Adebiyi, University of California Los Angeles, Atmospheric and Oceanic Science, Los Angeles, CA, United States, Yue Huang, University of California Los Angeles, Los Angeles, CA, United States and Jasper F Kok, University of California, Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, CA, United States
Abstract:
Coarse mineral dust aerosols affect the climate by scattering and absorbing both short-wave and long-wave radiation. However, there are still large uncertainties in radiative effects, in part due to regional heterogeneity of mineral dust. Here, we couple a global chemical transport model (IMPACT) with a radiative transfer module (RRTMG) in conjunction with the Dust Constraints from joint Observational-Modelling-Experimental analysis (DustCOMM) data set to estimate the radiative effects of mineral dust. The model results suggest that coarse mineral dust substantially contributes to a warming effect at the top of the atmosphere over the source regions. Additional sensitivity simulations were performed to investigate the sensitivity of the radiative effects to some key parameters such as the dust asphericity and iron oxides.
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