Simulation of the 2018 Global Dust Storm on Mars Using the NASA Ames Mars GCM: A Multitracer Approach

DOI Web Site Web Site Web Site Web Site 被引用文献3件
  • T. Bertrand
    NASA/Ames Research Center, Moffett Field Mountain View CA USA
  • R. J. Wilson
    NASA/Ames Research Center, Moffett Field Mountain View CA USA
  • M. A. Kahre
    NASA/Ames Research Center, Moffett Field Mountain View CA USA
  • R. Urata
    NASA/Ames Research Center, Moffett Field Mountain View CA USA
  • A. Kling
    NASA/Ames Research Center, Moffett Field Mountain View CA USA

書誌事項

公開日
2020-06-28
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2019je006122
公開者
American Geophysical Union (AGU)

この論文をさがす

説明

<jats:title>Abstract</jats:title><jats:p>Global dust storms are the most thermodynamically significant dust events on Mars. The most recent of these events occurred in 2018. Although it was monitored by several spacecraft in orbit and on the surface, many questions remain regarding its onset, expansion and decay. Here, we model the 2018 event with the National Aeronautics and Space Administration (NASA) Ames Mars Global Climate Model in order to better understand the evolution of the storm. Our results highlight a mechanism for the expansion of the storm: the initial equatorial regional storm creates a zonal atmospheric temperature gradient causing strong equatorial eastward winds and thus rapid eastward transport of dust and subsequent lifting. The model shows rapid back and forth transfer of dust between western and eastern hemispheres reservoirs, which may also play an important role in the storm's development through teleconnections involving replenishment of surface dust. The model also shows that gigantic dust plumes occur during the storm's mature phase, injecting dust up to 80 km. Our analysis shows that their upward motion in the atmosphere is due to the ascending branches of Hadley cells, whose intensity is reinforced during the storm with increasing dustiness. We show that the global atmospheric warming during the storm cause vapor and water ice clouds to migrate to higher altitudes, in line with recent observations. Finally, we find that the choice of effective radius for the lifted dust particle size distribution impacts the intensity of the Hadley circulation and could explain some of the differences obtained between model results and observations.</jats:p>

収録刊行物

被引用文献 (3)*注記

もっと見る

問題の指摘

ページトップへ