Contributions of gravity waves to the momentum,heat and turbulent energy budget of the upper mesosphere and lower thermosphere |
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| Affiliation: | 1. Department of Anatomical Pathology, Pathology North, John Hunter Hospital, Newcastle, NSW, Australia;2. Senior Project Manager, Royal College of Pathologists of Australasia, Surry Hills, Sydney, NSW, Australia;1. Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan;2. Institute of Space Science, National Central University, Jhongli 32001, Taiwan;1. Institut de Recherche en Astrophysique et Planétologie, CNRS-UPS-CNES, Toulouse, France;2. Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan;3. Laboratoire de Physique et Chimie de l’environment et l’espace, Université Orleans-CNRS, Orleans, France;1. Max-Planck-Institute for Solar System Research, 37077, Göttingen, Germany;2. Rheinisches Institut fuer Umweltforschung, Abteilung Planetforschung, Cologne, Germany;3. Space Sciences Laboratory, U.C. Berkeley, Berkeley, CA, USA;4. Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA;5. NASA Goddard Space Flight Center, MD, USA;6. Laboratory for Atmospheric and Space Physics, Univ. of Colorado, Boulder, CO, USA;7. Institute of Space Research, Moscow, Russia |
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| Abstract: | The role of gravity waves for the momentum and heat budget of the atmosphere between approximately 70 and 110 km height is considered. Parameterization schemes for vertical gravity wave diffusivity, generalized Rayleigh friction, viscous force, heat conduction and kinetic energy dissipation are reviewed. Eddy diffusion parameterization and its relation to the gravity wave approach is also discussed and it is shown that principal similarities exist in both concepts, especially when irregular (stochastic) contributions to the perturbations are modeled. Special attention is paid to the dissipation of perturbation kinetic energy and its contribution to the heat budget of the mesopause region. It is concluded that the amount of energy which can be attributed to the part of the gravity wave spectrum contributing to generalized Rayleigh friction above the mesopause is of the order of 10% of the total perturbation energy. |
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