Extraction of Momentum Flux of Monochromatic Gravity Waves Using Spectroscopic Imaging

Jing Tang, Farzad Kamalabadi, Alan Z. Liu, Gary R. Swenson

Research output: Contribution to conferencePaperpeer-review


Atmospheric gravity waves (AGWs) play a significant role in the dynamics and thermal balance of the upper atmosphere. The vertical fluxes of horizontal momentum characterizing the cross-correlation between the wave-induced vertical wind perturbations and the associated horizontal wind have proved to be difficult to measure. In this paper, we develop a novel technique for calculating momentum fluxes of monochromatic wave components from spectroscopic imaging and meteor radar wind measurement. Our approach uses the two-dimensional (2-D) cross-periodogram of two consecutive Doppler-shifted time differenced (TD) images to identify a dominant wave component and extract the wave parameters. Besides estimating the average perturbation of the dominant wave in the whole field of view (FOV), 2-D short-time Fourier transform is applied to the TD images to obtain the strongest perturbation of this wave in a portion of the FOV. With the wave parameters acquired, we calculate the momentum flux of the dominant wave component The alternation of the direction and strength of dominant waves can be tracked for each clear night. Nightly averages provide information for investigating seasonal and geographical variation in momentum flux of gravity waves.

Original languageEnglish (US)
Number of pages3
StatePublished - 2003
Event2003 IGARSS: Learning From Earth's Shapes and Colours - Toulouse, France
Duration: Jul 21 2003Jul 25 2003


Other2003 IGARSS: Learning From Earth's Shapes and Colours

ASJC Scopus subject areas

  • Computer Science Applications
  • General Earth and Planetary Sciences


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