Mesopause region temperature structure observed by sodium resonance lidar |
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| Authors: | Barclay Clemesha Dale Simonich Paulo Batista |
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| Institution: | 1. Atmospheric Physics Department, Saint-Peterburg State University, Saint-Peterburg, Russia;2. Theoretical Physics Department, Immanuel Kant Baltic Federal University, Kaliningrad, Russia;1. Leibniz-Institute for Atmospheric Physics, University of Rostock, Ostseebad Kühlungsborn, Schlossstraße 6, D-18225 Mecklenburg, Germany;2. Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany;1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;2. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;3. University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Mesopause region temperature measurements made with a sodium resonance lidar show two unexpected features: (1) Strong positive temperature gradients are often associated with strong gradients in the sodium concentration and (2) positive temperature gradients are generally much stronger than negative ones. Although the structures we see frequently appear to be associated with gravity waves or tides, the asymmetrical temperature oscillations cannot be explained as the result of simple wave propagation. We suggest that strong positive temperature gradients correspond to regions of high atmospheric stability, where eddy diffusion is inhibited, permitting the build-up of strong gradients in temperature and minor constituent mixing ratio. |
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