On forcing the winter polar warmings in the martian middle atmosphere during dust storms

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

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Using a Martian general circulation model, we investigated the changes in the meridional circulation during planet-encircling dust storms on Mars that produce strong temperature vertical inversions in the middle atmosphere over winter polar regions. It is shown that vigorous poleward and downward transport, and, consequently, the adiabatic heating are caused by dissipating thermal tides, planetary and resolved small-scale gravity waves and eddies in almost equal degree. The increase of tidal forcing is mainly due to a stronger excitation in the summer hemisphere. Contribution of the stationary planetary wave (SPW) with the zonal wavenumber s = 1 increases during dust storms due to intensified generation in the lower atmosphere as well as due to more favorable vertical propagation. SPW (s = 2) varies less with the dust load, dissipates lower, and contributes to the warming only below ~ 0.1 mb. Transient planetary wave (s = 1, period ~ 5 sols) with a barotropic/baroclinic vertical structure provides up to 1/3 of the forcing by SPW (s = 1). For the first time, we demonstrated a significance of small-scale gravity waves and eddies in maintaining the meridional circulation in Martian middle atmosphere, at least in high winter latitudes during dust storms.

Original languageEnglish
Pages (from-to)913-921
Number of pages9
JournalJournal of the Meteorological Society of Japan
Volume87
Issue number5
DOIs
Publication statusPublished - 2009 Nov 26
Externally publishedYes

ASJC Scopus subject areas

  • Atmospheric Science

Fingerprint Dive into the research topics of 'On forcing the winter polar warmings in the martian middle atmosphere during dust storms'. Together they form a unique fingerprint.

  • Cite this