Signature of an overturning gravity wave in the mesospheric sodium layer: Comparison of a nonlinear photochemical-dynamical model and lidar observations

	Signature of an overturning gravity wave in the mesospheric sodium layer: Comparison of a nonlinear photochemical-dynamical model and lidar observations
	Xu, J. Y. ; Smith, A. K. ; Collins, R. L. ; She, C. Y.
刊名	Journal of Geophysical Research-Atmospheres
	2006
卷号	111 期号:D17 页码:D17301
关键词	mesopause region breaking signatures hyperfine-structure middle atmosphere temperature lidar co 41-degrees-n fort-collins na layer urbana 105-degrees-w
ISSN号	0148-0227
通讯作者	北京8701信箱
英文摘要	In this paper we study the evolution of the sodium layer in the presence of an overturning ( or convectively unstable) gravity wave using model simulations and lidar observations. The simulations employ a time-dependent, nonlinear, photochemical-dynamical model. The observations are a 9-day (210-hour) set of sodium density and temperature lidar measurements from Fort Collins, Colorado ( 41 degrees N, 105 degrees W). We model the evolution of large-scale ( vertical wavelength of 30 km) and small-scale ( vertical wavelength of 10 km) waves and the associated evolution of the sodium layer. We use filtering methods to identify waves of similar scales in the lidar measurements. The semidiurnal tide is the dominant large-scale wave in the lidar observations. We present the observed evolution of sodium density, mixing ratio, temperature, potential temperature, and buoyancy period over 24-hour periods. We find that the model and observations show similar behavior in the evolution of the sodium densities, mixing ratios, and potential temperature in response to large- and small-scale waves. The model and observations indicate that the sodium density perturbation has a more pronounced overturning behavior in the bottomside of the layer than the topside of the layer. The sodium density also has a more pronounced overturning behavior than the mixing ratio and potential temperature. The overturning signatures in the sodium density due to small-scale waves occur periodically at the wave period even before the wave itself becomes completely unstable. The study suggests that observations of single overturning events in sodium densities should be interpreted with caution and may not indicate complete overturning of a wave.
学科主题	空间物理
收录类别	SCI
原文出处	http://www.agu.org/pubs/crossref/2006/2005JD006749.shtml
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1050]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Xu, J. Y.,Smith, A. K.,Collins, R. L.,et al. Signature of an overturning gravity wave in the mesospheric sodium layer: Comparison of a nonlinear photochemical-dynamical model and lidar observations[J]. Journal of Geophysical Research-Atmospheres,2006,111(D17):D17301.
APA	Xu, J. Y.,Smith, A. K.,Collins, R. L.,&She, C. Y..(2006).Signature of an overturning gravity wave in the mesospheric sodium layer: Comparison of a nonlinear photochemical-dynamical model and lidar observations.Journal of Geophysical Research-Atmospheres,111(D17),D17301.
MLA	Xu, J. Y.,et al."Signature of an overturning gravity wave in the mesospheric sodium layer: Comparison of a nonlinear photochemical-dynamical model and lidar observations".Journal of Geophysical Research-Atmospheres 111.D17(2006):D17301.