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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 113,
D24115,
18 PP., 2008
doi:10.1029/2008JD010039
Global distribution of atmospheric waves in the equatorial upper troposphere and lower stratosphere: COSMIC observations of wave mean flow interactions
Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan
Australian Antarctic Division, Kingston, Tasmania, Australia
Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan
Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
Center for Climate System Research, University of Tokyo, Kashiwa, Japan
Temperature profiles derived from Constellation Observing System for Meteorology, Ionosphere and Climate Global Positioning System Radio Occultation satellite constellation data are used to study equatorial gravity wave potential energy associated with waves having vertical wavelengths of less than 7 km and their interaction with the background quasi-biennial oscillation (QBO) wind. The data are binned into grids of size 20° in longitude and 5° in latitude. Results show evidence of vertically propagating convectively generated gravity waves interacting with the background mean flow. Enhancements in potential energy around the descending 0 m s−1 QBO eastward shear phase line are observed. Equatorially trapped Kelvin waves and Mixed Rossby Gravity Waves with zonal wave numbers s ≤ 9 are obtained by bandpass filtering wave number-frequency temperature spectra. Their temporal, spatial and vertical structures, propagation and wave-mean flow interactions are examined with respect to the background mean flow. Equatorial waves observed by COSMIC are compared with those seen in OLR data, with differences discussed.
Received 28 February 2008; accepted 7 August 2008; published 27 December 2008.
Citation: (2008), Global distribution of atmospheric waves in the equatorial upper troposphere and lower stratosphere: COSMIC observations of wave mean flow interactions, J. Geophys. Res., 113, D24115, doi:10.1029/2008JD010039.
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