First observation of mesospheric wind shear as high as 330 m s-1 km-1

Details First observation of mesospheric wind shear as high as 330 m s-1 km-1 First observation of mesospheric wind shear as high as 330 m s-1 km-1

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..954w&link_type=abstract

Annales Geophysicae, vol. 13, Issue 9, pp.954-958

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Mesospheric wind profiles with an altitude resolution of 25 m have been obtained by means of radar tracking of foil chaff clouds. Such experiments were performed during winter 1990 at Biscarrosse, France (44°N, 1°W). On one flight, a wind shear as high as 330 m s-1 km-1 at 87.4 km and a region of dynamical instability between 86 and 88 km was measured. This wind shear is believed to be the largest value ever measured in the mesosphere. The region of dynamical instability results from a superposition of two wave motions, and is found to link well with enhanced turbulence and small-scale wave activity. Acknowledgements. I thank D. R. McDiarmid of the Herzberg Institute of Astrophysics, National Research Council, Canada, for important ideas and discussions during the development of this work. I thank the referees for useful comments which have improved the paper. I also thank E.M. Poulter of NIWA for helpful suggestions, and for reading the manuscript and making useful comments. The work was supported by contract CO1309 of the New Zealand Foundation for Research, Science and Technology. Topical Editor C.-G. Fälthammar thanks K. Mursula and W. J. Hughes for their help in evaluating this paper.--> Correspondence to: W. Allan-->

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