Eddy diffusion models for the mesosphere and lower thermosphere |
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| Affiliation: | 1. State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;3. Ontario Ministry of the Environment, Conservation and Parks, 125 Resources Road, Toronto, ON M9P 3V6, Canada;4. Nanjing University School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, China;1. Institute of Environmental Assessment and Water Research (IDÆA-CSIC), C/ Jordi Girona 18, 08034 Barcelona, Spain;2. Barcelona University, Chemistry Faculty, C/ de Martí i Franquès, 1-11, 08028 Barcelona, Spain;3. National Research Centre for the Working Environment, Lersø Parkallé 105, Copenhagen DK-2100, Denmark;4. Institute of Ceramic Technology (ITC) - AICE - Universitat Jaume I, Campus Universitario Riu Sec, Av. Vicent Sos Baynat s/n, 12006 Castellón, Spain |
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| Abstract: | Two-dimensional eddy diffusion around mesopause heights is modelled by means of a set of parameters relating eddy transports to average fields of meteorological quantities like wind variance and potential temperature. The so-called K-theory approach is used. The parameters chosen in this study allow easy modification of the K-models. This is thought to enable better adjustment and further development of the transport parameterization in accordance with future exploration of the transport phenomena and their physical background in the middle atmosphere. The models in their present state have been used to study a few problems associated with the climatological behaviour of the mesosphere and lower thermosphere: the relative importance of convective and eddy transports, implications of the mean winter anomaly of ionospheric absorption, the problem of strong mean vertical winds near the mesopause and the formation of the NO density minimum around 85 km altitude. |
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