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Gravity Wave Activities in the Upper Mesosphere Observed at King Sejong Station, Antarctica (62.22°S, 58.78°W) and Their Potential Sources in the Lower Atmosphere

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Title
Gravity Wave Activities in the Upper Mesosphere Observed at King Sejong Station, Antarctica (62.22°S, 58.78°W) and Their Potential Sources in the Lower Atmosphere
Other Titles
남극 세종기지 유성레이더를 이용하여 관측한 중간권 상부 중력파 활동 분석 및 하층 대기 파동 원천 파악
Authors
Song, Byeong-Gwon
Song, In-Sun
Chun, Hye-Yeong
Lee, Changsup
Keywords
King Sejong station; gravity wave; mesosphere; meteor radar; wave source
Issue Date
2019
Citation
Song, Byeong-Gwon, et al. 2019. Gravity Wave Activities in the Upper Mesosphere Observed at King Sejong Station, Antarctica (62.22°S, 58.78°W) and Their Potential Sources in the Lower Atmosphere. 2019 CEDAR workshop. Eldorado Hotel, Santa Fe, Nwe Mexico. 2019.06.16~2019.06.21.
Abstract
Gravity wave (GW) activities in the upper mesosphere and their potential sources in the lower atmosphere are investigated using meteor radar observations at King Sejong Station, Antarctica (KSS; 62.22S, 58.78W) for 8 years (20072014). GW activities are estimated through hourly GW wind variances obtained from an improved methodology that explicitly removes large-scale wind components (including tides and planetary waves such as 2- and 4-day waves) from observed meteor echoes. A clear semi-annual variation of the GW activities with solstitial maxima and equinoctial minima exists, except above 94 km where GW activities are strong in AugustSeptember. Potential GW sources in the lower atmosphere, including orography, jet stream, and deep convection, are investigated using reanalysis datasets. Orography around KSS is a likely source of GWs in winter and autumn, as stationary mountain waves can propagate up into the upper mesosphere without being filtered by the westerlies from the surface to the upper mesosphere. The residual of the nonlinear balance equation at 5 hPa, which is a diagnostic of flow imbalance associated with the polar night jet (PNJ), significantly correlate with the observed GW activities at z = 98 km during spring and autumn, while no significant correlation is found in wintertime due to critical-level filtering and Doppler shifting via the strong PNJ. Deep convection at midlatitudes is a likely source of the GWs in nearly all seasons, with the strongest correlation in storm tracks in winter.
URI
https://repository.kopri.re.kr/handle/201206/12228
Conference Name
2019 CEDAR workshop
Conference Place
Eldorado Hotel, Santa Fe, Nwe Mexico
Conference Date
2019.06.16~2019.06.21
Appears in Collections  
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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