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Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China
Li, Q.; Xu, J.; Yue, J.; Yuan, W.; Liu, X.; Li, Q (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationANNALES GEOPHYSICAE
2011
Volume29Issue:8Pages:1401-1410
ISSN0992-7689
Language英语
KeywordAtmospheric Composition And Structure Airglow And Aurora Meteorology And Atmospheric Dynamics Middle Atmosphere Dynamics Waves And Tides
AbstractAn all-sky airglow imager (ASAI) was installed at Xinglong, in northern China (40.2 degrees N, 117.4 degrees E) in November 2009 to study the morphology of atmospheric gravity waves (AGWs) in the mesosphere and lower thermosphere (MLT) region. Using one year of OH airglow imager data from December 2009 to November 2010, the characteristics of short-period AGWs are investigated and a yearlong AGW climatology in northern China is first ever reported. AGW occurrence frequency in summer and winter is higher than that in equinoctial months. Observed bands mainly have horizontal wavelengths from 10 to 35 km, observed periods from 4 to 14 min and observed horizontal phase speeds in the range of 30 to 60 ms(-1). Most of the bands propagate in the meridional direction. The propagation directions of the bands show a strong southwestward preference in winter, while almost all bands propagate northeastward in summer. Although the wind filtering in the middle atmosphere may control AGW propagations in the zonal direction, the non-uniform distribution of wave sources in the lower atmosphere may contribute to the anisotropy in the meridional direction in different seasons. Additionally, as an indication of local instability, the characteristics of ripples are also analyzed. It also shows seasonal variations, occurring more often in summer and winter and mainly moving westward in summer and eastward in winter.; An all-sky airglow imager (ASAI) was installed at Xinglong, in northern China (40.2 degrees N, 117.4 degrees E) in November 2009 to study the morphology of atmospheric gravity waves (AGWs) in the mesosphere and lower thermosphere (MLT) region. Using one year of OH airglow imager data from December 2009 to November 2010, the characteristics of short-period AGWs are investigated and a yearlong AGW climatology in northern China is first ever reported. AGW occurrence frequency in summer and winter is higher than that in equinoctial months. Observed bands mainly have horizontal wavelengths from 10 to 35 km, observed periods from 4 to 14 min and observed horizontal phase speeds in the range of 30 to 60 ms(-1). Most of the bands propagate in the meridional direction. The propagation directions of the bands show a strong southwestward preference in winter, while almost all bands propagate northeastward in summer. Although the wind filtering in the middle atmosphere may control AGW propagations in the zonal direction, the non-uniform distribution of wave sources in the lower atmosphere may contribute to the anisotropy in the meridional direction in different seasons. Additionally, as an indication of local instability, the characteristics of ripples are also analyzed. It also shows seasonal variations, occurring more often in summer and winter and mainly moving westward in summer and eastward in winter.
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/122/3222
Collection空间科学部
Corresponding AuthorLi, Q (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Li, Q.,Xu, J.,Yue, J.,et al. Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China[J]. ANNALES GEOPHYSICAE,2011,29(8):1401-1410.
APA Li, Q.,Xu, J.,Yue, J.,Yuan, W.,Liu, X.,&Li, Q .(2011).Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China.ANNALES GEOPHYSICAE,29(8),1401-1410.
MLA Li, Q.,et al."Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China".ANNALES GEOPHYSICAE 29.8(2011):1401-1410.
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