Equatorial Atmosphere Radar observations of short vertical wavelength gravity waves in the upper troposphere and lower stratosphere region induced by localized convection

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  • S. K. Dhaka
    Department of Physics, Rajdhani College University of Delhi New Delhi India
  • M. K. Yamamoto
    Research Institute for Sustainable Humanosphere Kyoto University Kyoto Japan
  • Y. Shibagaki
    Department of Communication Engineering Osaka Electro‐communication University Osaka Japan
  • H. Hashiguchi
    Research Institute for Sustainable Humanosphere Kyoto University Kyoto Japan
  • S. Fukao
    Research Institute for Sustainable Humanosphere Kyoto University Kyoto Japan
  • H.‐Y. Chun
    Department of Atmospheric Sciences Yonsei University Seoul Korea

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<jats:p>Equatorial Atmosphere Radar (EAR) observations made at Koto Tabang (0.2°S, 100.32°E) revealed that gravity waves with a short vertical wavelength (∼2–4 km) were evident in the upper troposphere and lower stratosphere (UTLS). Results are based on two convective events observed on 11 April and 26 April 2004. Above the convective region (∼12–13 km heights) the decrease in the vertical wavelength (<jats:italic>λ</jats:italic><jats:sub>z</jats:sub>) found in vertical wind profiles was noticeable. Large portions of the induced gravity waves with short <jats:italic>λ</jats:italic><jats:sub>z</jats:sub> dissipated in the lower stratosphere and hence their role is considered to be of importance for the dynamics of UTLS region. Gradual decrease in <jats:italic>λ</jats:italic><jats:sub>z</jats:sub> of gravity waves between 12 km and 20 km heights is partly made by a steady increase in Brunt Väisälla frequency from ∼12 km to 20 km heights. The decrease in amplitude in UTLS may be due to damping mechanism.</jats:p>

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