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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 10
Ann. Geophys., 23, 3237–3260, 2005
https://doi.org/10.5194/angeo-23-3237-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 3237–3260, 2005
https://doi.org/10.5194/angeo-23-3237-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Nov 2005

30 Nov 2005

Studies on atmospheric gravity wave activity in the troposphere and lower stratosphere over a tropical station at Gadanki

I. V. Subba Reddy1, D. Narayana Rao2, A. Narendra Babu1, M. Venkat Ratnam3, P. Kishore4, and S. Vijaya Bhaskara Rao1 I. V. Subba Reddy et al.
  • 1Department of Physics, Sri Venkateswara University, Tirupati - 517 502, India
  • 2National MST Radar Facility, Department. of Space, Gadanki - 517 112, India
  • 3Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611 0011, Japan
  • 4National Institute of Information and Communications Technology, Tokyo 184-8795, Japan

Abstract. MST radars are powerful tools to study the mesosphere, stratosphere and troposphere and have made considerable contributions to the studies of the dynamics of the upper, middle and lower atmosphere. Atmospheric gravity waves play a significant role in controlling middle and upper atmospheric dynamics. To date, frontal systems, convection, wind shear and topography have been thought to be the sources of gravity waves in the troposphere. All these studies pointed out that it is very essential to understand the generation, propagation and climatology of gravity waves. In this regard, several campaigns using Indian MST Radar observations have been carried out to explore the gravity wave activity over Gadanki in the troposphere and the lower stratosphere. The signatures of the gravity waves in the wind fields have been studied in four seasons viz., summer, monsoon, post-monsoon and winter. The large wind fluctuations were more prominent above 10 km during the summer and monsoon seasons. The wave periods are ranging from 10 min-175 min. The power spectral densities of gravity waves are found to be maximum in the stratospheric region. The vertical wavelength and the propagation direction of gravity waves were determined using hodograph analysis. The results show both down ward and upward propagating waves with a maximum vertical wave length of 3.3 km. The gravity wave associated momentum fluxes show that long period gravity waves carry more momentum flux than the short period waves and this is presented.

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