Gravity wave and the Quasi-biennial oscillation associated with tropospheric variability

2010 Fiscal Year Final Research Report

• Project/Area Number: 20740280
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: KAWATANI Yoshio Japan Agency for Marine-Earth Science and Technology, 地球環境変動領域, 研究員 (00392960)
• Project Period (FY): 2008 – 2010
• Keywords: 中層大気力学 / 重力波 / 赤道波 / 赤道準2年振動

Research Abstract

Equatorial trapped waves (EQWs) and internal gravity waves (GWs) generated by cumulus convections in the troposphere are investigated using an atmospheric general circulation model (AGCM). First, the mechanism of zonally non-uniform distribution of GWs and EQWs was clarified. Next, the roles of EQWs and GWs in driving the quasi-biennial oscillation (QBO) are analyzed. Finally, the QBO in a global warming climate is investigated. These results are published in Journals.

Research Products

• [Journal Article] The roles of equatorial trapped waves and internal inertia-gravity waves in driving the quasi-biennial oscillation. Part I: Zonal mean wave forcing. (2010)
  • Author(s): Kawatani, Y., K.Sato, T.J.Dunkerton, S.Watanabe, S.Miyahara, M.Takahashi.
  • Journal Title: J.Atmos. Sci. 67 Pages: 963-980
  • Peer Reviewed
• [Journal Article] The roles of equatorial trapped waves and internal inertia-gravity waves in driving the quasi-biennial oscillation. Part II: Three-dimensional distribution of wave forcing. (2010)
  • Author(s): Kawatani, Y., K.Sato, T.J.Dunkerton, S.Watanabe, S.Miyahara, M.Takahashi.
  • Journal Title: J.Atmos. Sci 67 Pages: 981-997
  • Peer Reviewed
• [Journal Article] The quasi-biennial oscillation in a double CO2 climate. (2010)
  • Author(s): Kawatani, Y., K.Hamilton, S.Watanabe.
  • Journal Title: J.Atmos. Sci. 68 Pages: 265-283
  • Peer Reviewed
• [Journal Article] Global distribution of atmospheric waves in the equatorial upper troposphere and lower stratosphere: AGCM simulation of sources and propagation. (2009)
  • Author(s): Kawatani, Y., M.Takahashi, K.Sato, S.P.Alexander, T.Tsuda.
  • Journal Title: J.Geophys. Res. 114 Pages: D01102
  • Peer Reviewed
• [Presentation] The quasi-biennial oscillation in a double CO2 climate. (2011)
  • Author(s): 河谷芳雄
  • Organizer: AGU Chapman Conference on Atmospheric Gravity Waves and Their Effects on General Circulation and Climate.
  • Place of Presentation: Honolulu, USA
  • Year and Date: 2011-03-02
• [Presentation] The roles of 3-dimensional propagating gravity waves and equatorial trapped gravity waves on driving the Quasi Biennial Oscillation : A study of high reso lution atmospheric general circulation model. (2009)
  • Author(s): 河谷芳雄
  • Organizer: 17th Conference on Atmospheric and Oceanic Fluid Dynamics and 15th Conference on Middle Atmosphere
  • Place of Presentation: Stowe, USA
  • Year and Date: 2009-06-10
• [Presentation] The roles of 3-dimensional propagating gravity waves and equatorial trapped gravity waves on driving the Quasi Biennial Oscillation. (2008)
  • Author(s): 河谷芳雄
  • Organizer: 4th SPARC General Assembly
  • Place of Presentation: Bologna, Italy
  • Year and Date: 2008-09-01