Middle atmosphere dynamics with gravity wave interactions in the numerical spectral model: Tides and planetary waves |
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| Authors: | HG Mayr JG Mengel KL Chan FT Huang |
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| Institution: | 1. Goddard Space Flight Center, Laboratory for Atmospheres, Code 613.3, 8800 Greenbelt Road, Greenbelt, MD 20771, USA;2. Science Systems and Applications Inc., Lanham, MD, USA;3. University of Science and Technology, Hong Kong, China;4. University of Maryland, Baltimore, MD, USA;1. Geophysical Center of Russian Academy of Science, Moscow, Russia;2. Arctic and Antarctic Research Institute, Saint-Petersburg, Russia;3. Sodankylä Geophysical Observatory, Sodankylä, Finland;4. Department of Physics and Astronomy, University of Leicester, Leicester, UK;1. National Atmospheric Research Laboratory (NARL), Gadanki, India;2. Department of Physics, Sri Venkateswara University, Tirupati, India;3. Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan;4. B1, CEEBROS, 47/20, IIIrd Main Road, Chennai, India;5. EGRL, Indian Institute of Geomagnetism (IIG), Mumbai, India;6. Indian Institute of Geomagnetism (IIG), Mumbai, India;7. Space Physics Laboratory, VSSC, Thiruvananthapuram, India;1. High Altitude Observatory, National Center for Atmospheric Research, P. O. Box 3000, Boulder, CO 80307-3000, USA;2. Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan |
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| Abstract: | As Lindzen (1981) had shown, small-scale gravity waves (GW) produce the observed reversals of the zonal-mean circulation and temperature variations in the upper mesosphere. The waves also play a major role in modulating and amplifying the diurnal tides (DT) (e.g., Waltersheid, 1981; Fritts and Vincent, 1987, Fritts, 1995a). We summarize here the modeling studies with the mechanistic numerical spectral model (NSM) with Doppler spread parameterization for GW (Hines, 1997a, Hines, 1997b), which describes in the middle atmosphere: (a) migrating and non-migrating DT, (b) planetary waves (PW), and (c) 10-h global-scale inertio gravity waves. Numerical experiments are discussed, which illuminate the influence of GW filtering and nonlinear interactions between DT, PW, and zonal mean variations. |
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