Seasonal changes of the baroclinic wave activity in the northern hemisphere of Mars simulated with a GCM

Takeshi Kuroda, Alexander S. Medvedev, Paul Hartogh, Masaaki Takahashi

研究成果: Article査読

29 被引用数 (Scopus)

抄録

Seasonal changes in baroclinic wave activity during northern autumns (Ls = 195-225°) and winters (Ls = 280-300°) are studied with a Martian general circulation model. For the weak dust load, the simulated s = 2 harmonic with 3.1 sols period dominates near the surface, while s = 1 (5.5 sols period) is more prominent at higher altitudes during autumns. In winters, the s = 1 wave has stronger amplitudes and a deep (up to 0.1 mb) vertical structure. These simulations are consistent with observations from MGS. We provide a simple explanation for the planetary wave changes in terms of seasonal variations of the background zonal mean fields. In particular, the observed and simulated significant reduction of the baroclinic wave activity during strong solstitial season dust storms occurs due to the stabilization of the jet stream with respect to baroclinic disturbances and due to the associated weakening of the wave excitation.

本文言語English
論文番号L09203
ジャーナルGeophysical Research Letters
34
9
DOI
出版ステータスPublished - 2007 5 16
外部発表はい

ASJC Scopus subject areas

  • 地球物理学
  • 地球惑星科学(全般)

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