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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 5
Ann. Geophys., 21, 1183–1195, 2003
https://doi.org/10.5194/angeo-21-1183-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 21, 1183–1195, 2003
https://doi.org/10.5194/angeo-21-1183-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 May 2003

31 May 2003

Momentum flux associated with gravity waves in the low-latitude troposphere

S. R. Prabhakaran Nayar and S. Sreeletha S. R. Prabhakaran Nayar and S. Sreeletha
  • Department of Physics, University of Kerala, Kariavattom, Trivandrum-695 581 India

Abstract. The vertical fluxes of horizontal momentum at tropospheric heights are calculated for four days, 25–28 August 1999. The mean zonal wind during these days show the presence of strong westward wind at the upper troposphere. Both the symmetric beam radar method and the power spectral method of evaluation of vertical flux of zonal and meridional momentum shows nearly the same result for quiet conditions. The temporal evolution of the momentum flux is estimated for a day with strong zonal shear and convection. These results indicate that on 28 August 1999, the strong downward vertical wind in the lower altitude range is associated with upward vertical flux of zonal momentum, and strong upward vertical wind is associated with downward vertical flux. Similarly, the strong shear in zonal wind is associated with the increase in negative values in vertical flux in the upper troposphere. Analysis of the role of wave periods in the transport of momentum flux indicates that the vertical momentum flux magnitude is not evenly distributed in all wave periods, but instead it peaks at certain wave periods in the range 10 to 100 min.

Key words. Meteorology and atmospheric dynamics (convective process; tropical meteorology; precipitation)

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