Gravity wave reflection: Case study based on rocket data |
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| Institution: | 1. National Atmospheric Research Laboratory, Gadanki, India;2. Indian Institute of Geomagnetism, New Panvel, Navi Mumbai, India;3. 3/78, Periyavilai, Pulippunam, Kanyakumari, India;4. Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Tirunelveli, India;5. MF Radar Facility, Indian Institute of Geomagnetism, Shivaji University Campus, Kolhapur, India;1. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Equatorial Geophysical Research Laboratory, Krishnapuram, Tirunelveli, 627011, India;2. National Atmospheric Research Laboratory, Gadanki, Tirupati, 510112, India;3. Indian Institute of Geomagnetism, New Panvel, Navi Mumbai, 410218, India |
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| Abstract: | Since gravity waves significantly influence the atmosphere by transporting energy and momentum, it is important to study their wave spectrum and their energy dissipation rates. Besides that, knowledge about gravity wave sources and the propagation of the generated waves is essential. Originating in the lower atmosphere, gravity waves can move upwards; when the background wind field is equal to their phase speed a so-called critical layer is reached. Their breakdown and deposition of energy and momentum is possible. Another mechanism which can take place at critical layers is gravity wave reflection.In this paper, gravity waves which were observed by foil chaff measurements during the DYANA (DYnamics Adapted Network for the Atmosphere) campaign in 1990 in Biscarrosse (44°N, 1°W)—as reported by Wüst and Bittner 2006. Non-linear wave–wave interaction: case studies based on rocket data and first application to satellite data. Journal of Atmospheric and Solar-Terrestrial Physics 68, 959–976]—are investigated to look for gravity wave reflection processes. Following nonlinear theory, energy dissipation rates according to Weinstock 1980. Energy dissipation rates of turbulence in the stable free atmosphere. Journal of the Atmospheric Sciences 38, 880–883] are calculated from foil chaff cloud and falling sphere data and compared with the critical layer heights. Enhanced energy dissipation rates are found at those altitudes where the waves’ phase speed matches the zonal background wind speeds. Indication of gravity wave trapping is found between two altitudes of around 95 and 86 km. |
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