Thermal creep-assisted dust lifting on Mars: Wind tunnel experiments for the entrainment threshold velocity

Threshold Windspeeds for Sand on Mars Wind Tunnel Simulations

Wind friction threshold speeds (u,t) for particle movement (saltation) were determined in a wind tunnel operating at martian surface pressure with a 95 percent CO 2 and 5 percent air atmosphere. The relationship between friction speed (u,) and free-stream velocity (%0) is extended to the critical case for Mars of momentum thickness Reynolds numbers (Re0) between 425 and 2000. It is determined t...

Mars Boundary Layer Stability Experiments of Dust Threshold

Investigating wind erosion threshold velocity and the effect of soil characteristics in dust production centers in Alborz province

Dust phenomenon is one of the most common and destructive phenomena in the dry and desert regions of the world and Iran, which can have harmful effects on human life and the environment. Wind erosion and the removal and transport of soil particles by wind create dust. Controlling wind erosion will be effective when enough information is available on the factors affecting it.  The results of the...

Lifting Dust on Mars by Greenhouse Effects and Thermophoresis

Introduction: Dust is continuously lifted from the Martian surface and put into atmospheric suspension. This is well visible during dust devil activity [1] and planet encircling dust storms [2]. The mechanism for the atmospheric dust entrainment has been debated for a long time. Wind stress can easily put dust into suspension under Earth conditions, i.e. at ~1000 mbar surface pressure. In princ...

The Effect of Model Resolution on Wind-stress Dust Lifting within the Lmd/uk Mars Global Circulation Model

Modelling Martian surface dust lifting: This work uses the UK version of the LMD Mars Global Circulation Model (“the MGCM”). The MGCM is a global, multi-level spectral model of the lower and middle regions of the Martian atmosphere. The UK version of the model uses a truncated series of spherical harmonics to represent horizontal variations in atmospheric fields, with the field values stored as...