On the origins of mesospheric gravity waves

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  • K. Sato
    Department of Earth and Planetary Science University of Tokyo Tokyo Japan
  • S. Watanabe
    Research Institute for Global Change Japan Agency for Marine‐Earth Science and Technology Yokohama Japan
  • Y. Kawatani
    Research Institute for Global Change Japan Agency for Marine‐Earth Science and Technology Yokohama Japan
  • Y. Tomikawa
    National Institute of Polar Research Tachikawa Japan
  • K. Miyazaki
    Research Institute for Global Change Japan Agency for Marine‐Earth Science and Technology Yokohama Japan
  • M. Takahashi
    Center for Climate System Research University of Tokyo Kashiwa Japan

書誌事項

公開日
2009-10
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2009gl039908
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Using hourly data from a three‐year simulation based on a gravity‐wave resolving general circulation model, we have first inferred a global view of gravity wave sources and propagation affecting significantly the momentum balance in the mesosphere. The meridional cross section of momentum fluxes suggests that there are a few dominant propagation paths originating from the subtropics in summer and the middle to high latitudes in winter. These gravity waves are focused into the mesospheric jets in their respective seasons, acting effectively to decelerate the jets. The difference in the source latitudes likely contributes to the hemispheric asymmetries of the jets. The horizontal distribution of the momentum fluxes indicates that the dominant sources are steep mountains and tropospheric westerly jets in winter and vigorous monsoon convection in summer. The monsoon regions are the most important window to the middle atmosphere in summer because of the easterlies associated with the monsoon circulation.</jats:p>

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