Large Eddy Simulations of the Dusty Martian Convective Boundary Layer With MarsWRF

被引:21
作者
Wu, Zhaopeng [1 ,2 ]
Richardson, Mark, I [3 ]
Zhang, Xi [4 ]
Cui, Jun [1 ,2 ,5 ]
Heavens, Nicholas G. [6 ,7 ]
Lee, Christopher [3 ,8 ]
Li, Tao [2 ,9 ]
Lian, Yuan [3 ]
Newman, Claire E. [3 ]
Soto, Alejandro [10 ]
Temel, Orkun [11 ,12 ]
Toigo, Anthony D. [13 ]
Witek, Marcin [14 ]
机构
[1] Sun Yat Sen Univ, Sch Atmospher Sci, Planetary Environm & Astrobiol Res Lab, Zhuhai, Peoples R China
[2] CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China
[3] Aeolis Res, Chandler, AZ USA
[4] Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA
[5] Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China
[6] Space Sci Inst, Boulder, CO USA
[7] Imperial Coll, Dept Earth Sci & Engn, London, England
[8] Univ Toronto, Dept Phys, Toronto, ON, Canada
[9] Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Geospace Environm, Hefei, Peoples R China
[10] Southwest Res Inst, Boulder, CO USA
[11] Katholieke Univ Leuven, Inst Astron, Leuven, Belgium
[12] Royal Observ Belgium, Brussels, Belgium
[13] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA
[14] Jet Prop Lab, Pasadena, CA USA
基金
中国国家自然科学基金;
关键词
Martian atmosphere; large eddy simulation; convective boundary layer; dust inhomogeneity; radiative-dynamical feedback; STORMS; ATMOSPHERE; SURFACE; MODEL; CIRCULATION; RESOLUTION; IMPACT; DISSIPATION; PATHFINDER; DYNAMICS;
D O I
10.1029/2020JE006752
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Large eddy simulation (LES) of the Martian convective boundary layer (CBL) with a Mars-adapted version of the Weather Research and Forecasting model is used to examine the impact of aerosol dust radiative-dynamical feedbacks on turbulent mixing. The LES is validated against spacecraft observations and prior modeling. To study dust redistribution by coherent dynamical structures within the CBL, two radiatively active dust distribution scenarios are used: one in which the dust distribution remains fixed and another in which dust is freely transported by CBL motions. In the fixed dust scenario, increasing atmospheric dust loading shades the surface from sunlight and weakens convection. However, a competing effect emerges in the free dust scenario, resulting from the lateral concentration of dust in updrafts. The resulting enhancement of dust radiative heating in upwelling plumes both generates horizontal thermal contrasts in the CBL and increases buoyancy production, jointly enhancing CBL convection. We define a dust inhomogeneity index (DII) to quantify how much dust is concentrated in upwelling plumes. If the DII is large enough, the destabilizing effect of lateral heating contrasts can exceed the stabilizing effect of surface shading such that the CBL depth increases with increasing dust optical depth. Thus, under certain combinations of total dust optical depth and the lateral inhomogeneity of dust, a positive feedback exists between dust optical depth, the vigor and depth of CBL mixing, and-to the extent that dust lifting is controlled by the depth and vigor of CBL mixing-the further lifting of dust from the surface.
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页数:47
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