| Nonlinear interactions between gravity waves and tides |
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| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划(973计划) |
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| 摘 要： | In this study, we present the nonlinear interactions between gravity waves (GWs) and tides by using the 2D numerical model for the nonlinear propagation of GWs in the compressible atmosphere. During the propagation in the tidal background, GWs become instable in three regions, that is z = 75―85 km, z = 90―110 km and z = 115―130 km. The vertical wavelength firstly varies gradually from the initial 12 km to 27 km. Then the newly generated longer waves are gradually compressed. The longer and shorter waves occur in the regions where GWs propagate in the reverse and the same direction of the hori-zontal mean wind respectively. In addition, GWs can propagate above the main breaking region (90—110 km). During GWs propagation, not only the mean wind is accelerated, but also the amplitude of tide is amplified. Especially, after GWs become instable, this amplified effect to the tidal amplitude is much obvious.
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| 收稿时间： | 2007-01-08 |
| 修稿时间： | 2007-02-07 |
Nonlinear interactions between gravity waves and tides |
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| Liu Xiao,Xu JiYao,Ma RuiPing. Nonlinear interactions between gravity waves and tides[J]. Science in China(Earth Sciences), 2007, 50(8): 1273-1279. DOI: 10.1007/s11430-007-0072-2 |
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| Authors: | Liu Xiao Xu JiYao Ma RuiPing |
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| Affiliation: | 1. State Key Laboratory of Space Weather, Center for Space Science and Applied research, Chinese Academy of Sciences, Beijing 100080, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China
2. State Key Laboratory of Space Weather, Center for Space Science and Applied research, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | In this study, we present the nonlinear interactions between gravity waves (GWs) and tides by using the 2D numerical model for the nonlinear propagation of GWs in the compressible atmosphere. During the propagation in the tidal background, GWs become instable in three regions, that is z = 75–85 km, z =90–110 km and z = 115–130 km. The vertical wavelength firstly varies gradually from the initial 12 km to 27 km. Then the newly generated longer waves are gradually compressed. The longer and shorter waves occur in the regions where GWs propagate in the reverse and the same direction of the horizontal mean wind respectively. In addition, GWs can propagate above the main breaking region (90–110 km). During GWs propagation, not only the mean wind is accelerated, but also the amplitude of tide is amplified. Especially, after GWs become instable, this amplified effect to the tidal amplitude is much obvious. Supported by the National Natural Science Foundation of China (Grant Nos. 40621003, 40225011 and 40674088) and the National Major Basic Research Project (Grant No. 2006CB806306), and in part by the Foundation of the Key Laboratory of Geospace Environment & Geodesy of Ministry of Education, China |
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| Keywords: | gravity waves tides mean wind nonlinear interactions gravity waves parameterization |
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