Dust Devil - an overview | ScienceDirect Topics
2019年4月1日 · Dust devil vortices are generated by solar heating of the surface which causes warm air to rise and interact with cool air, or as air interacts with an irregular surface (Greeley et al., 2003). The dust devil vortex creates an area of lower pressure at its core, known as Δp (Greeley et al., 2003). As the dust devil moves rapidly across the ...
Clearing enhances dust devil formation - ScienceDirect
2008年10月1日 · Gentle slopes favour dust devil formation, but not mountains and foothills (Brooks, 1960). Although they tend not to form where there is extensive tree-cover (Sinclair, 1969), the existence of vegetation per se does not preclude dust devil formation (Mattsson et al., 1993, McGinnigle, 1966).
The whirlwinds of Elysium: A catalog and meteorological …
2021年2月1日 · A previous calculation, based on observed dust devil diameters obtained by imaging at the Gusev site by the Spirit rover, indicated an area fraction of 1.6 × 10 −4 (Lorenz and Jackson, 2016). However, this was calculated for the entire period (i.e. based on an optical diameter population and calculated over the full day).
Dust Devil - an overview | ScienceDirect Topics
Dust Devil. A Dust Devil is a natural phenomenon on Mars that contributes to the omnipresent dusty atmosphere by lifting and transporting dust particles through the wind, occasionally leading to globe-encircling storms. AI generated definition based on: Encyclopedia of the Solar System (Second Edition), 2007
The contribution of dust devils and dusty plumes to the aerosol …
2016年2月1日 · For a standard dust devil and a dust plume, the average vertical dust flux values (F d) were 0.7 gm −2 s −1 and 0.1 gm −2 s −1, respectively, and the maximum and minimum values were 1.13 gm −2 s −1 and 0.47 gm −2 s −1 (Koch and Renno, 2005). The σ can be calculated according to Equation (2).
Temporal and spatial characteristics of dust devils and their ...
2018年6月1日 · The dust devil emission: The simple thermodynamic theory for dust devils proposed by Renno et al. (1998) states that the total dust devil emission (DAE tot) depends on the thermodynamic efficiency: (1) D A E t o t = S × σ × F d, where F d is the estimated average dust flux in a dust devil flux of 0.7 g m −2 s −1 (Koch and Renno, 2005), S ...
First quantitative characterization of the Martian dust devil ...
2024年9月15日 · From this model, the height (H) of a dust devil is calculated by H = Wε/σ, where W is the average vertical velocity of the particles at the top of the saltation layer, σ and ε are the electric conductivity and the electric permittivity of the Martian atmosphere, respectively (σ = 2.5 × 10 −12 S/m and ε = 1.6 ε 0, where ε 0 is the ...
Albedo analysis of dust devil-induced slope streaks and tracks on …
2024年11月15日 · The reflectance values of the dust devil tracks range from 0.18 to 0.20, while slope streaks have reflectance values between 0.16 and 0.19. The relative albedo measurements of the dust devil tracks are generally consistent with the results of Munaretto et al. (2021). In general, our albedo analysis revealed that all measured slope streaks are ...
Dust devils: Characteristics of the forward motion from a Saharan ...
2021年3月1日 · A dust devil is a dynamic phenomenon, constantly evolving in order to reach equilibrium with air packs and terrains it crosses. However, the typical duration of the acquired meteorological signatures is of the order of tens of seconds. For such a short time, the approximation of steady state is reasonable.
Bright dust devil tracks on Earth: Implications for their formation …
2011年1月1日 · Dust devils are low pressure vortices formed from unstable near-surface warm air generated by insolation and are common on Earth and Mars (see review by Balme and Greeley (2006)). On Mars, dust devil tracks (DDTs) were first observed in Mariner 9 imagery as dark filamentary tracks (Veverka, 1976).