Small scale structure and turbulence in the mesosphere and lower thermosphere at high latitudes in winter |
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| Institution: | 1. Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region, China;2. Department of Information Systems, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region, China;3. Department of Computer Science, Chu Hai College of Higher Education, Hong Kong, Hong Kong Special Administrative Region, China;1. Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK;2. Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK;1. School of Aeronautics and Astronautics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, PR China;2. School of Physics and Materials Engineering, Dalian Minzu University, Dalian, 116600, PR China |
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| Abstract: | The MAP/WINE campaign has yielded information on small scale structure and turbulence in the winter mesosphere and lower thermosphere by a number of very different remote and in situ techniques. We have assimilated the data from the various sources and thus attempted to present a coherent picture of the small scale dynamics of the atmosphere between 60 and 100 km. We review physical mechanisms which could be responsible for the observed effects, such as ion density fluctuations, radar echoes and wind corners. Evidence has been found for the existence of dynamic structures extending over distances of the order of 100 km; these may be turbulent or non-turbulent. The results indicate that gravity wave saturation is a plausible mechanism for the creation of turbulence and that laminar flows, sharply defined in height and widespread horizontally, may exist. |
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