气候变化领域集成服务门户(CCPortal): Activities of Small-Scale Gravity Waves in the Upper Mesosphere Observed From Meteor Radar at King Sejong Station, Antarctica (62.22°S, 58.78°W) and Their Potential Sources

CCPortal

DOI	10.1029/2021JD034528
	Activities of Small-Scale Gravity Waves in the Upper Mesosphere Observed From Meteor Radar at King Sejong Station, Antarctica (62.22°S, 58.78°W) and Their Potential Sources
	Song B.-G.; Song I.-S.; Chun H.-Y.; Lee C.; Kam H.; Kim Y.H.; Kang M.-J.; Hindley N.P.; Mitchell N.J.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	Gravity wave (GW) activities in the upper mesosphere (80–100 km) and their potential sources are investigated using meteor radar observations at King Sejong Station, Antarctica (KSS; 62.22°S, 58.78°W) during recent 14 years (2007–2020). GW activities are estimated by horizontal wind variances of small-scale GWs (periods <2 h, horizontal wavelength <400 km, or vertical wavelength <3–5 km). The wind variances show clear semiannual variations with maxima at solstices, and annual variations are also seen above z = 90 km. The deseasonalized wind variances at z = 96.8 km have a statistically significant periodicity of ∼11 years that can be associated with solar cycle variations. Three major potential GW sources in the lower atmosphere are examined. Orography is a potential source of GWs in winter and autumn, when the basic-state wind is westerly from the surface up to the mesosphere. The residual of the nonlinear balance equation (RNBE) at 5 hPa, a diagnostic of the GWs associated with jet stream, is the largest in winter and has a secondary maximum in spring. The correlation between the observed GWs and RNBE is significant in equinoxes, while correlation is low in winter. Deep convection in storm tracks is a potential source in autumn and winter. Secondary GWs generated in the mesosphere can also be observed in the upper mesosphere. Ray-tracing analysis for airglow images observed at KSS indicates that secondary GWs are mostly generated in winter mesosphere, which may be associated with the breaking of orographic GWs. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Antarctica; gravity waves; meteor radar; MLT; upper mesosphere
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185217
作者单位	Korea Polar Research Institute, Incheon, South Korea; Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea; Korea Astronomy and Space Science Institute, Daejeon, South Korea; Department of Astronomy, Space Science and Geology, Chungnam National University, Daejeon, South Korea; Centre for Space, Atmospheric and Oceanic Science, University of Bath, Bath, United Kingdom; British Antarctic Survey, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Song B.-G.,Song I.-S.,Chun H.-Y.,et al. Activities of Small-Scale Gravity Waves in the Upper Mesosphere Observed From Meteor Radar at King Sejong Station, Antarctica (62.22°S, 58.78°W) and Their Potential Sources[J],2021,126(10).
APA	Song B.-G..,Song I.-S..,Chun H.-Y..,Lee C..,Kam H..,...&Mitchell N.J..(2021).Activities of Small-Scale Gravity Waves in the Upper Mesosphere Observed From Meteor Radar at King Sejong Station, Antarctica (62.22°S, 58.78°W) and Their Potential Sources.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Song B.-G.,et al."Activities of Small-Scale Gravity Waves in the Upper Mesosphere Observed From Meteor Radar at King Sejong Station, Antarctica (62.22°S, 58.78°W) and Their Potential Sources".Journal of Geophysical Research: Atmospheres 126.10(2021).