Large winds and wind shears caused by the nonlinear interactions between gravity waves and tidal backgrounds in the mesosphere and lower thermosphere

DOI Web Site Web Site 被引用文献4件
  • Xiao Liu
    State Key Laboratory of Space Weather, Center for Space Science and Applied Research Chinese Academy of Sciences Beijing China
  • Jiyao Xu
    State Key Laboratory of Space Weather, Center for Space Science and Applied Research Chinese Academy of Sciences Beijing China
  • Jia Yue
    Atmospheric and Planetary Sciences Hampton University Hampton Virginia USA
  • Han Li Liu
    High Altitude Observatory National Center for Atmospheric Research Boulder Colorado USA
  • Wei Yuan
    State Key Laboratory of Space Weather, Center for Space Science and Applied Research Chinese Academy of Sciences Beijing China

書誌事項

公開日
2014-09
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2014ja020221
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>A two‐dimensional nonlinear numerical model was used to simulate large winds (≥ 100 m s<jats:sup>−1</jats:sup>) and wind shears (≥ 40 m s<jats:sup>−1</jats:sup> km<jats:sup>−1</jats:sup>) in the mesosphere and lower thermosphere (MLT) that are caused by the interaction between gravity waves (GWs) and migrating tidal background. By varying the wavelengths of GWs and the phases of diurnal and semidiurnal tides, 64 numerical experiments were performed. Our numerical experiments indicate that both migrating diurnal and semidiurnal tides strongly modulate the occurrence of GW breaking, and the resulted large winds and wind shears. The simulated large winds and wind shears are in good agreement with those from the rocket‐sounding chemical release measurements. Moreover, the occurrence of large wind shears highly depends on the phases of migrating tides in local time, which is in agreement with the reported lidar observations. The local time dependence of large wind shears is mainly attributed to the filtering and/or hindering effects of diurnal and semidiurnal tidal winds on GWs. Our simulation reveals that the nonlinear interactions between GWs breaking and the migrating diurnal and semidiurnal tides may play an important role in driving the large winds and wind shears in the MLT region and their local time dependence.</jats:p>

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