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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 6
Ann. Geophys., 27, 2407–2415, 2009
https://doi.org/10.5194/angeo-27-2407-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: 11th International Workshop on Technical and Scientific Aspects...

Ann. Geophys., 27, 2407–2415, 2009
https://doi.org/10.5194/angeo-27-2407-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  11 Jun 2009

11 Jun 2009

High resolution observations of turbulence in the troposphere and lower stratosphere over Gadanki

G. Dutta1, M. C. Ajay Kumar2, P. Vinay Kumar1, P. V. Rao3, B. Bapiraju4, and H. Aleem Basha1 G. Dutta et al.
  • 1Department of Physics, Anwarul-Uloom College, New Mallepally, Hyderabad, India
  • 2Department of Physics, Vanjari Seethaiah Memorial College of Engg., Bandlaguda, Hyderabad, India
  • 3Department of Physics, Vasavi College of Engg., Ibrahimbagh, Hyderabad, India
  • 4Department of Physics, A. V. College, Domalguda, Hyderabad, India

Abstract. High resolution (150 m) wind measurements from 13–17 July 2004 by Mesosphere-Stratosphere-Troposphere (MST) radar and 15–16 July 2004 by Lower Atmospheric Wind Profiler (LAWP) have been used to study the time variation of turbulence intensity. Layers of higher turbulence are observed in the lower stratosphere on 15–16 July which give rise to mixing in the region. Enhancement in short-period gravity wave activity and turbulent layers are observed after 22:00 LT which could be due to a dry convection event that occurred at that time. The breakdown of the convectively generated high frequency waves seems to have given rise to the turbulence layers. Wind shear is found to be high above the easterly jet, but very poor correlation is observed between square of wind shear and turbulence parameters in the region. The heights of the turbulent layers in the lower stratosphere do not correlate with levels of minimum Richardson number. A monochromatic inertia gravity wave could be identified during 13–17 July 2004. A non-linear interaction between the waves of different scales as proposed by Hines (1992) might also be responsible for the breakdown and generation of turbulence layers.

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