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MS Defense

Department of Atmospheric Science

Wed., May 8, 3:00 pm, EN6085

Dust radiative effects on climate by glaciating mixed-phase clouds

Yang Shi

University of Wyoming

Abstract

Mineral dust plays an important role in the primary formation of ice crystals in mixed-phase clouds by acting as ice nucleating particles (INPs). It can influence the cloud phase transition and radiative forcing of mixed-phase clouds, both of which are crucial to global energy budget and climate. In this study, we investigate the dust indirect effects on mixed-phase clouds through heterogeneous ice nucleation with the US Department of Energy Exascale Earth System Model (E3SM). Dust and INP concentrations simulated from two versions of E3SM with three ice nucleation parameterizations were evaluated against observations in the Northern Hemisphere (NH). Constrained by these observations, E3SM shows that dust INPs induce a global mean net cloud radiative effect of 0.06 to 0.25 W m-2with the predominant warming appearing in the NH midlatitudes. However, a cooling effect is found in the Arctic due to reduced longwave cloud forcing.

 

 

 

 

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