Physics and chemistry of the mesopause region |
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| Institution: | 1. Department Física, PPGCTA, Universidade Estadual da Paraíba, UEPB, 58.109-790, Campina Grande-PB, Brazil;2. Institute for Meteorology, Leipzig University, Germany;3. Instituto Nacional de Pesquisas Espaciais, INPE, Brazil;1. National Atmospheric Research Laboratory (NARL), Gadanki, India;2. Department of Physics, Sri Venkateswara University, Tirupati, India;3. B1, CEEBROS, 47/20, IIIrd Main Road, Chennai, India;1. Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 306 North Wright Street, Urbana, IL 61801, USA;2. Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL 32114, USA |
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| Abstract: | This paper is based on a tutorial presentation given at the 2001 CEDAR (Coupling Energetics and Dynamics of Atmospheric Regions) workshop. It gives an overview of chemical and physical processes important in the mesopause region. Topics covered include composition, photochemistry, dynamics and transport, and energy budget. Special emphasis is placed on the role of variations in composition in linking the physical and chemical processes. Examples from numerical models and observations are given to illustrate the points. Two specific cases where composition plays a role are described. The first illustrates that hemispheric differences in CO2 due to transport by the mean circulation enhance the mesopause temperature extremes near solstices. The second shows how transport of chemical species by gravity waves can alter the heating structure in such a way as to destabilize the gravity wave. |
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