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Influences of non-isothermal atmospheric backgrounds on variations of gravity wave parameters
Liu Xiao; Zhou QiHou; Yuan Wei; Xu JiYao; Liu, X (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationSCIENCE CHINA-TECHNOLOGICAL SCIENCES
2012
Volume55Issue:5Pages:1251-1257
ISSN1674-7321
Language英语
KeywordGravity Wave Non-isothermal Atmosphere Atmospheric Coupling
AbstractBecause of the importance of gravity waves (GWs) in coupling different atmospheric regions, further studies are necessary to investigate the characteristics of GW propagation in a non-isothermal atmosphere. Using a nonlinear numerical model, we simulate the propagation of small amplitude GWs with various wavelengths in different non-isothermal atmospheres. Our results show that the GW vertical wavelength undergoes sharp changes above the stratopause and mesopause region. Specifically, for a GW with an initial vertical wavelength of 5 km, the seasonal background temperature structure difference at 50 degrees latitude can cause the vertical wavelength to vary by similar to 2 km in the mesosphere and by as large as similar to 4.5 km in the lower thermosphere. In addition, the GW paths exhibit great divergence in the height range of similar to 65-110 km. Our results also show that the variations of GW path, vertical wavelength and horizontal phase velocity are not synchronized in a non-isothermal atmosphere as in an isothermal atmosphere. Despite the fact that all GWs change their characteristics as they propagate upward in a non-isothermal atmosphere, the variations relative to the initial parameters at a reference height are similar for different initial vertical wavelengths. Our results indicate that the changing characteristics of a gravity wave in a non-isothermal atmosphere need to be considered when investigating the relationship of GWs at two different heights.; Because of the importance of gravity waves (GWs) in coupling different atmospheric regions, further studies are necessary to investigate the characteristics of GW propagation in a non-isothermal atmosphere. Using a nonlinear numerical model, we simulate the propagation of small amplitude GWs with various wavelengths in different non-isothermal atmospheres. Our results show that the GW vertical wavelength undergoes sharp changes above the stratopause and mesopause region. Specifically, for a GW with an initial vertical wavelength of 5 km, the seasonal background temperature structure difference at 50 degrees latitude can cause the vertical wavelength to vary by similar to 2 km in the mesosphere and by as large as similar to 4.5 km in the lower thermosphere. In addition, the GW paths exhibit great divergence in the height range of similar to 65-110 km. Our results also show that the variations of GW path, vertical wavelength and horizontal phase velocity are not synchronized in a non-isothermal atmosphere as in an isothermal atmosphere. Despite the fact that all GWs change their characteristics as they propagate upward in a non-isothermal atmosphere, the variations relative to the initial parameters at a reference height are similar for different initial vertical wavelengths. Our results indicate that the changing characteristics of a gravity wave in a non-isothermal atmosphere need to be considered when investigating the relationship of GWs at two different heights.
Indexed BySCI ; EI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3216
Collection空间科学部
Corresponding AuthorLiu, X (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Liu Xiao,Zhou QiHou,Yuan Wei,et al. Influences of non-isothermal atmospheric backgrounds on variations of gravity wave parameters[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2012,55(5):1251-1257.
APA Liu Xiao,Zhou QiHou,Yuan Wei,Xu JiYao,&Liu, X .(2012).Influences of non-isothermal atmospheric backgrounds on variations of gravity wave parameters.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,55(5),1251-1257.
MLA Liu Xiao,et al."Influences of non-isothermal atmospheric backgrounds on variations of gravity wave parameters".SCIENCE CHINA-TECHNOLOGICAL SCIENCES 55.5(2012):1251-1257.
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