Martian dust devil statistics from high-resolution large-eddy simulations

Seiya Nishizawa, Masatsugu Odaka, Yoshiyuki O. Takahashi, Ko Ichiro Sugiyama, Kensuke Nakajima, Masaki Ishiwatari, Shin Ichi Takehiro, Hisashi Yashiro, Yousuke Sato, Hirofumi Tomita, Yoshi Yuki Hayashi

Research output: Contribution to journalArticle

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Abstract

Dust devils are one of the key elements in the Martian atmospheric circulation. In order to examine their statistics, we conducted high-resolution (up to 5 m) and wide-domain (about 20 × 20 km2) large-eddy simulations of the Martian daytime convective layer. Large numbers of dust devils developed spontaneously in the simulations, which enabled us to represent a quantitative consideration of Martian dust devil frequency distributions. We clarify the distributions of size and intensity, a topic of debate, and conclude that the maximum vertical vorticity of an individual dust devil has an exponential distribution, while the radius and circulation have power law distributions. A grid refinement experiment shows that the rate parameter of the vorticity distribution and the exponent of the circulation distribution are robust. The mode of the size distribution depends on the resolution, and it is suggested that the mode is less than 5 m.

Original languageEnglish
Pages (from-to)4180-4188
Number of pages9
JournalGeophysical Research Letters
Volume43
Issue number9
DOIs
Publication statusPublished - May 16 2016

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dust devil
large eddy simulation
dust
statistics
high resolution
vorticity
circulation distribution
atmospheric circulation
frequency distribution
daytime
power law distribution
exponents
radii
distribution
simulation
experiment

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Nishizawa, S., Odaka, M., Takahashi, Y. O., Sugiyama, K. I., Nakajima, K., Ishiwatari, M., ... Hayashi, Y. Y. (2016). Martian dust devil statistics from high-resolution large-eddy simulations. Geophysical Research Letters, 43(9), 4180-4188. https://doi.org/10.1002/2016GL068896

Martian dust devil statistics from high-resolution large-eddy simulations. / Nishizawa, Seiya; Odaka, Masatsugu; Takahashi, Yoshiyuki O.; Sugiyama, Ko Ichiro; Nakajima, Kensuke; Ishiwatari, Masaki; Takehiro, Shin Ichi; Yashiro, Hisashi; Sato, Yousuke; Tomita, Hirofumi; Hayashi, Yoshi Yuki.

In: Geophysical Research Letters, Vol. 43, No. 9, 16.05.2016, p. 4180-4188.

Research output: Contribution to journalArticle

Nishizawa, S, Odaka, M, Takahashi, YO, Sugiyama, KI, Nakajima, K, Ishiwatari, M, Takehiro, SI, Yashiro, H, Sato, Y, Tomita, H & Hayashi, YY 2016, 'Martian dust devil statistics from high-resolution large-eddy simulations', Geophysical Research Letters, vol. 43, no. 9, pp. 4180-4188. https://doi.org/10.1002/2016GL068896
Nishizawa S, Odaka M, Takahashi YO, Sugiyama KI, Nakajima K, Ishiwatari M et al. Martian dust devil statistics from high-resolution large-eddy simulations. Geophysical Research Letters. 2016 May 16;43(9):4180-4188. https://doi.org/10.1002/2016GL068896
Nishizawa, Seiya ; Odaka, Masatsugu ; Takahashi, Yoshiyuki O. ; Sugiyama, Ko Ichiro ; Nakajima, Kensuke ; Ishiwatari, Masaki ; Takehiro, Shin Ichi ; Yashiro, Hisashi ; Sato, Yousuke ; Tomita, Hirofumi ; Hayashi, Yoshi Yuki. / Martian dust devil statistics from high-resolution large-eddy simulations. In: Geophysical Research Letters. 2016 ; Vol. 43, No. 9. pp. 4180-4188.
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