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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 12
Ann. Geophys., 26, 3731–3739, 2008
https://doi.org/10.5194/angeo-26-3731-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 3731–3739, 2008
https://doi.org/10.5194/angeo-26-3731-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  25 Nov 2008

25 Nov 2008

Influence of gravity waves and tides on mesospheric temperature inversion layers: simultaneous Rayleigh lidar and MF radar observations

S. Sridharan1, S. Sathishkumar2, and S. Gurubaran2 S. Sridharan et al.
  • 1National Atmospheric Research Laboratory, Gadanki-517 112, Pakala Mandal, Chittoor, India
  • 2Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Krishnapuram, Tirunelveli-627 011, India

Abstract. Three nights of simultaneous Rayleigh lidar temperature measurements over Gadanki (13.5° N, 79.2° E) and medium frequency (MF) radar wind measurements over Tirunelveli (8.7° N, 77.8° E) have been analyzed to illustrate the possible effects due to tidal-gravity wave interactions on upper mesospheric inversion layers. The occurrence of tidal gravity wave interaction is investigated using MF radar wind measurements in the altitude region 86–90 km. Of the three nights, it is found that tidal gravity wave interaction occurred in two nights. In the third night, diurnal tidal amplitude is found to be significantly larger. As suggested in Sica et al. (2007), mesospheric temperature inversion seems to be a signature of wave saturation in the mesosphere, since the temperature inversion occurs at heights, when the lapse rate is less than half the dry adiabatic lapse rate.

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