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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 32, issue 3
Ann. Geophys., 32, 263–275, 2014
https://doi.org/10.5194/angeo-32-263-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 32, 263–275, 2014
https://doi.org/10.5194/angeo-32-263-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 21 Mar 2014

Regular paper | 21 Mar 2014

Nonlinear interaction of gravity waves in a nonisothermal and dissipative atmosphere

K. M. Huang1,2,3,4, S. D. Zhang1,3,4, F. Yi1,3,4, C. M. Huang1,3,4, Q. Gan1,3,4, Y. Gong1,3,4, and Y. H. Zhang5 K. M. Huang et al.
  • 1School of Electronic Information, Wuhan University, Wuhan, China
  • 2Key Laboratory of Geospace Environment, University of Science & Technology of China, Chinese Academy of Sciences, Hefei, China
  • 3Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, China
  • 4State Observatory for Atmospheric Remote Sensing, Wuhan, China
  • 5College of Hydrometeorology, Nanjing University of Information Science and Technology, Nanjing, China

Abstract. Starting from a set of fully nonlinear equations, this paper studies that two initial gravity wave packets interact to produce a third substantial packet in a nonisothermal and dissipative atmosphere. The effects of the inhomogeneous temperature and dissipation on interaction are revealed. Numerical experiments indicate that significant energy exchange occurs through the nonlinear interaction in a nonisothermal and dissipative atmosphere. Because of the variability of wavelengths and frequencies of interacting waves, the interaction in an inhomogeneous temperature field is characterised by the nonresonance. The nonresonant three waves mismatch mainly in the vertical wavelengths, but match in the horizontal wavelengths, and their frequencies also tend to match throughout the interaction. Below 80 km, the influence of atmospheric dissipation on the interaction is rather weak due to small diffusivities. With the further propagation of wave above 80 km, the exponentially increasing atmospheric dissipation leads to the remarkable decay and slowly upward propagation of wave energy. Even so, the dissipation below 110 km is not enough to decrease the vertical wavelength of wave. The dissipation seems neither to prevent the interaction occurrence nor to prolong the period of wave energy exchange, which is different from the theoretical prediction based on the linearised equations. The match relationship and wave energy evolution in numerical experiments are helpful in further investigating interaction of gravity waves in the middle atmosphere based on experimental observations.

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