Exploring The Climatic Impact Of Bi-Modal Dust Particle
Size Distributions During The My34/2018 Global Dust
Storm With The Nasa Ames Mars Global Climate Model
R. A. Urata, Bay Area Environmental Research Institute, Moffett Field, Ca, Usa (Richard.A.Urata@Nasa.Gov),
T. Bertrand, Lesia, Paris Observatory, France, M. A. Kahre, R. J. Wilson, Nasa Ames Research Center,
Moffett Field, Ca, Usa, A. M. Kling, Bay Area Environmental Research Institute, Moffett Field, Ca, Usa,
Mike Wolff, Space Science Institute, Boulder, Co, Usa.

Introduction: The 2018 Global Dust Storm
(Gds) Has Been Observed On Mars From The Surface
And From Orbit. Recent Modeling Efforts Of The 2018
Gds Highlight That Climate Models Do Not Simultaneously Capture Both The Evolution Of Surface Temperatures, Semi-Diurnal Tide Amplitude, And The Decay Rate
Of Global Column Dust Opacities, Which Suggests That
Significant Changes In Dust Particle Sizes May Occur
During The Dust Storm (E.G., [1], [2]). These Models
Typically Assume A Constant Lifted Dust Particle Size—
With Size Evolution Occurring In The Atmosphere But
Only Because Of Gravitational Sedimentation. For
Instance, Simulations With Sufficiently Large Particles
Sizes To Produce Reasonable Decay/Sedimentation