Effects of Ambient Rotation on Dust Devils

Ito, Junshi; Niino, Hiroshi; Nakanishi, Mikio

doi:10.2151/sola.2011-042

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…2a) was similar to the cellular convective ("fish net") pattern (see Stull 1988;Fujiwara et al 2011). This feature is similar to previous observations (Fujiwara et al 2011) and LES results (e.g., Kanak et al 2000;Kanak 2005;Kanak 2008;Ohno and Takemi 2010;Ito et al 2010;Ito et al 2011;Raasch and Franke 2011). However, the wind velocity in the eastern area, about 4 m s −1 , was stronger than that in all other areas.…”

Section: Resultssupporting

confidence: 91%

“…These features were also observed on 25 May 2005, when many of the detected vortices were also cyclonic (see Table 1). Therefore, our observational results support the results of the LES study performed by Ito et al (2011). When cyclonic vortices were detected, a cyclonic mesoscale circulation was found to exist over the 3D-CDL observational area, and the urban surface-temperature excess increased.…”

Section: Discussionsupporting

confidence: 89%

“…Several numerical studies without the sources suggest that vertical vorticity of dust devils can be generated from convective cell circulation (e.g., Kanak et al 2000). Recently, Ito et al (2011) ) and showed that the ambient rotation significantly affects the rotational direction of the vortices. So far, however, no simultaneous observation of mesoscale circulations and dust devils has been conducted to clarify whether mesoscale circulations really affect rotation sense of dust devils.…”

Section: Introductionmentioning

confidence: 99%

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Observed Effect of Mesoscale Vertical Vorticity on Rotation Sense of Dust Devil-Like Vortices in an Urban Area

Fujiwara¹,

Yamashita

Fujiyoshi

2012

SOLA

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Dust devil-like vortices were detected by a three-dimensional scanning coherent Doppler lidar (3D-CDL) in an urban area of Sapporo, Japan, from April 2005 to July 2007. A total of 57 strong, dust devil-like vortices with vertical vorticity exceeding 0.1 s −1 were detected in 8 days of the observation period and were associated with a convective cell (fish net) pattern of wind fields detected by the 3D-CDL. The observed vortices had both rotation senses for 7 days. However, all of 7 dust devil-like vortices were cyclonic on 4 October 2006 when cyclonic mesoscale circulation with 4.5 × 10 −4 s −1 in vertical vorticity existed over the 3D-CDL observation area. This result is the observed evidence that mesoscale circulation affects rotation sense of vortices.

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Section: Resultssupporting

confidence: 91%

Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Observed Effect of Mesoscale Vertical Vorticity on Rotation Sense of Dust Devil-Like Vortices in an Urban Area

Fujiwara¹,

Yamashita

Fujiyoshi

2012

SOLA

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“…Such a strategy was primarily employed to account for the strong diurnal cycle of synoptic and regional winds on Mars, driven by thermal tides and slope flow. In terrestrial LES, experiments which include the Coriolis force to simulate the effect of background wind rotation were performed by Ito et al (2011).…”

Section: Coupling Dynamical Integrations With Physical Processesmentioning

confidence: 99%

Large-Eddy Simulations of Dust Devils and Convective Vortices

Spiga

Barth

et al. 2016

Space Sci Rev

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International audienceIn this review, we address the use of numerical computations called Large-Eddy Simulations (LES) to study dust devils, and the more general class of atmospheric phenomena they belong to (convec-tive vortices). We describe the main elements of the LES methodology. We review the properties, statistics, and variability of dust devils and convective vortices resolved by LES in both terrestrial and Martian environments. The current challenges faced by modelers using LES for dust devils are also discussed i

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“…Kanak et al 2000). In such idealized environments, circulations about the vertical axis are produced by the turbulent convection in the CBL and updrafts accelerated by warm buoyant air stretch the vertical vorticity associated with the circulations (Ito et al 2011(Ito et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

Wind-Speed—Surface-Heat-Flux Feedback in Dust Devils

Ito

Niino

2016

Boundary-Layer Meteorol

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Strong winds associated with dust devils can induce locally large heat fluxes from the surface, and resulting enhanced buoyancy may further intensify the dust devils. This positive wind-surface-heat-flux feedback is studied using a large-eddy simulation of a convective boundary layer. A comparison of the results with and without the feedback process for the same environment demonstrates the significance of the feedback process for simulated dust devils.

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Effects of Ambient Rotation on Dust Devils

Cited by 9 publications

References 26 publications

Observed Effect of Mesoscale Vertical Vorticity on Rotation Sense of Dust Devil-Like Vortices in an Urban Area

Observed Effect of Mesoscale Vertical Vorticity on Rotation Sense of Dust Devil-Like Vortices in an Urban Area

Large-Eddy Simulations of Dust Devils and Convective Vortices

Wind-Speed—Surface-Heat-Flux Feedback in Dust Devils

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