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

Fujiwara, Chusei; Yamashita, Kazuya; Fujiyoshi, Yasushi

doi:10.2151/sola.2012-007

“…hurricanes) to rotate either clockwise or anticlockwise depending on the hemisphere, for dust devil-sized vortices no preferred sense of rotation has generally been observed and only a tiny impact on sense of rotation is predicted by Large Eddy Simulation modeling (Ito et al 2011). However, in situations where the mesoscale circulation is cyclonic or anticyclonic due to local weather patterns, dust devilsized vortices are predicted -and have been observed -to share the same sense of rotation (Ito et al 2011;Fujiwara et al 2012).…”

Section: Windmentioning

confidence: 99%

Multi-model Meteorological and Aeolian Predictions for Mars 2020 and the Jezero Crater Region

Newman

¹

,

Juárez

²

,

Pla‐García

³

et al. 2021

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Nine simulations are used to predict the meteorology and aeolian activity of the Mars 2020 landing site region. Predicted seasonal variations of pressure and surface and atmospheric temperature generally agree. Minimum and maximum pressure is predicted at $\text{Ls}\sim 145^{\circ}$ Ls ∼ 145 ∘ and $250^{\circ}$ 250 ∘ , respectively. Maximum and minimum surface and atmospheric temperature are predicted at $\text{Ls}\sim 180^{\circ}$ Ls ∼ 180 ∘ and $270^{\circ}$ 270 ∘ , respectively; i.e., are warmest at northern fall equinox not summer solstice. Daily pressure cycles vary more between simulations, possibly due to differences in atmospheric dust distributions. Jezero crater sits inside and close to the NW rim of the huge Isidis basin, whose daytime upslope (∼east-southeasterly) and nighttime downslope (∼northwesterly) winds are predicted to dominate except around summer solstice, when the global circulation produces more southerly wind directions. Wind predictions vary hugely, with annual maximum speeds varying from 11 to $19~\text{ms}^{-1}$ 19 ms − 1 and daily mean wind speeds peaking in the first half of summer for most simulations but in the second half of the year for two. Most simulations predict net annual sand transport toward the WNW, which is generally consistent with aeolian observations, and peak sand fluxes in the first half of summer, with the weakest fluxes around winter solstice due to opposition between the global circulation and daytime upslope winds. However, one simulation predicts transport toward the NW, while another predicts fluxes peaking later and transport toward the WSW. Vortex activity is predicted to peak in summer and dip around winter solstice, and to be greater than at InSight and much greater than in Gale crater.

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“…Inoue et al (2011) successfully detected vortices such as tornados and mesocyclones, although not dust devils, during a winter storm event with the use of a low-level scanning X-band Doppler radar. Fujiwara et al (2011Fujiwara et al ( , 2012 used a three-dimensional scanning Doppler lidar to detect dust-devil-like vortices that develop in the daytime under fair-weather convective conditions over an urban area. They revealed that invisible dust devils frequently occur from long-term observations.…”

Section: Japanmentioning

confidence: 99%

History and Applications of Dust Devil Studies

Lorenz

¹

,

Balme

²

,

Gu

³

et al. 2016

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Studies of dust devils, and their impact on society, are reviewed. Dust devils have been noted since antiquity, and have been documented in many countries, as well as on the planet Mars. As time-variable vortex entities, they have become a cultural motif. Three major stimuli of dust devil research are identified, nuclear testing, terrestrial climate studies, and perhaps most significantly, Mars research. Dust devils present an occasional safety hazard to light structures and have caused several deaths.

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History and Applications of Dust Devil Studies

Lorenz¹,

Balme²,

Gu³

et al. 2017

Space Sciences Series of ISSI

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Studies of dust devils, and their impact on society, are reviewed. Dust devils have been noted since antiquity, and have been documented in many countries, as well as on the planet Mars. As time-variable vortex entities, they have become a cultural motif. Three major stimuli of dust devil research are identified, nuclear testing, terrestrial climate studies, and perhaps most significantly, Mars research. Dust devils present an occasional safety hazard to light structures and have caused several deaths.

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

Cited by 6 publications

References 19 publications

Multi-model Meteorological and Aeolian Predictions for Mars 2020 and the Jezero Crater Region

Multi-model Meteorological and Aeolian Predictions for Mars 2020 and the Jezero Crater Region

History and Applications of Dust Devil Studies

History and Applications of Dust Devil Studies

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