Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China

	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.
刊名	ANNALES GEOPHYSICAE
	2011
卷号	29 期号:8 页码:1401-1410
关键词	Atmospheric composition and structure Airglow and aurora Meteorology and atmospheric dynamics Middle atmosphere dynamics Waves and tides
ISSN号	0992-7689
通讯作者	Li, Q (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
中文摘要	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.
英文摘要	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.
学科主题	空间物理
收录类别	SCI ; EI
资助信息	National Science Foundation of China [40890165, 40921063, 41074109, 41004063]; National Important Basic Research Project of China [2011CB811405]; Specialized Research Fund for State Key Laboratories; National Science Foundation
语种	英语
公开日期	2014-12-15
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/3222]
专题	国家空间科学中心_空间科学部
推荐引用方式 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..(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.