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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

Cited 1 time in wos
Cited 1 time in scopus
Title
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
Other Titles
남극 세종기지 유성레이다를 통해 관측된 중간권 상부 중력파 활동 및 파동 원천
Authors
Song, Byeong-Gwon
Song, I-S
Chun, H-Y
Lee, Changsup
Kam, H.
Kim, Y. H.
Kang, M-J
Hindley, N. P.
Mitchell, N. J.
Subject
Meteorology & Atmospheric Sciences
Keywords
Antarcticagravity wavesmeteor radarMLTupper mesosphere
Issue Date
2021-05-27
Citation
Song, Byeong-Gwon, et al. 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): 1-22.
Abstract
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.
URI
https://repository.kopri.re.kr/handle/201206/12985
DOI
http://dx.doi.org/10.1029/2021JD034528
Type
Article
Station
King Sejong Station
Indexed
SCIE
Appears in Collections  
2020-2020, Occurrence of aurora and their correlations with polar upper atmospheric and climate variabilities (20-20) / Jee, Geonhwa (PE20100)
2021-2021, Occurrence of aurora and their correlations with polar upper atmospheric and climate variabilities (21-21) / Jee, Geonhwa (PE21020)
2019-2019, Understanding polar upper atmospheric changes by energy inputs from the space environment and the lower atmosphere (19-19) / Jee, Geonhwa (PE19020)
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