Parameterization Of Cap-Edge Dust Lifting Over The
Southern Polar Region
K. C. Chow, J. Xiao, Y. M. Wang, State Key Laboratory Of Lunar And Planetary Sciences, Macau University
Of Science And Technology, Macau (Kcchow@Must.Edu.Mo)

Introduction:
While The Dust Climate On Mars Has Certain Variability Such As The Rare But Severe Global Or Planetencircling Dust Activities, It Appears To Have A Certain
Regular Variation Over A Martian Year As Indicated In
Some Observational Studies (Montabone Et Al. 2015;
Kass Et Al. 2016). Occurrence Of Southern Highlatitude Dust Activities (Shlda) Around The Southern
Solstice Period Have Been Observed For Many Martian
Years (E.G. Toigo Et Al. 2002; Imamura And Ito 2011;
Douté 2014), And Is Named As “B Storm” In Kass Et
Al. (2016). These Dust Events Occur Near The Southern
Cap-Edge Region And Play An Important Role In The
Observed Dust Climate. However, They Generally Cannot Be Simulated In The Existing Mars General Circulation Models. In This Study, An Approach Of Parameterization Has Been Proposed In Which The Dust Lifting
Threshold Stress Is Adjusted In According To The Surface Temperature Difference Between The Regolith And
The Ice In The Southern Polar Region.
The Above Setting Of Threshold Stress Over The
Cap-Edge Grid Points Is Based On The Following Two