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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 4
Ann. Geophys., 23, 1139–1145, 2005
https://doi.org/10.5194/angeo-23-1139-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 1139–1145, 2005
https://doi.org/10.5194/angeo-23-1139-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Jun 2005

03 Jun 2005

VHF volume-imaging radar observation of aspect-sensitive scatterers tilted in mountain waves above a convective boundary layer

R. M. Worthington1,2,3 R. M. Worthington
  • 1Institute of Mathematical and Physical Sciences, University of Wales, Aberystwyth, SY23 3BZ, UK
  • 2Radio Science Center for Space and Atmosphere (RASC), Kyoto University, Uji, Kyoto 611-0011, Japan
  • 3School of Earth, Atmospheric and Environmental Sciences, Univ. of Manchester, P.O. Box 88, Manchester, M60 1QD, UK

Abstract. Thin stable atmospheric layers cause VHF radars to receive increased echo power from near zenith. Layers can be tilted from horizontal, for instance by gravity waves, and the direction of VHF "glinting" is measurable by spatial domain interferometry or many-beam Doppler beam swinging (DBS). This paper uses the Middle and Upper atmosphere (MU) radar, Shigaraki, Japan as a volume-imaging radar with 64-beam DBS, to show tilting of layers and air flow in mountain waves. Tilt of aspect-sensitive echo power from horizontal is nearly parallel to air flow, as assumed in earlier measurements of mountain-wave alignment. Vertical-wind measurements are self-consistent from different beam zenith angles, despite the combined effects of aspect sensitivity and horizontal-wind gradients.

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