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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 2
Ann. Geophys., 16, 229–237, 1998
https://doi.org/10.1007/s00585-998-0229-0
© European Geosciences Union 1998
Ann. Geophys., 16, 229–237, 1998
https://doi.org/10.1007/s00585-998-0229-0
© European Geosciences Union 1998

  28 Feb 1998

28 Feb 1998

Night-to-night changes in the characteristics of gravity waves at stratospheric and lower-mesospheric heights

A. J. McDonald, L. Thomas, and D. P. Wareing A. J. McDonald et al.
  • Department of Physics, The University of Wales, Aberystwyth, Ceredigion, SY23 3BZ, UK

Abstract. Observations made with the co-located Rayleigh lidar and MST radar systems at Aberystwyth (52.4°N, 4.1°W) in Wales and radiosondes from Valentia (51.9°N, 10.2°W) in Eire are used to investigate the changes in the vertical propagation of gravity waves during periods of 4 days in June 1995 and February 1993. In each month, the lidar observations show that the wave activity in the upper stratosphere and lower mesosphere changes between two pairs of days. The radar and radiosonde measurements indicate that mountain waves make no contribution to the changes in intensity. Instead, the changes seem to arise largely from the presence or absence of long-period waves with vertical wavelengths near 8 and 10 km in June and February, respectively. The influence of such waves on the vertical wavenumber spectra is examined and related to the evidence for convective instabilities provided by the temperature profiles.

Key words. Rayleigh lidar · MST radar systems · Radiosondes · Gravity waves

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