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Seasonal and height variation of gravity wave activities observed by a meteor radar at King Sejong Station (62°S, 57°W), Antarctica

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Title
Seasonal and height variation of gravity wave activities observed by a meteor radar at King Sejong Station (62°S, 57°W), Antarctica
Other Titles
남극 세종과학기지 유성레이더에서 관측된 대기중량파의 계절적 특성
Authors
Kim, Jeong-Han
Choi, Jongmin
Lee, Changsup
Kim, Yong Ha
Jee, Geonhwa
Keywords
Gravity wave; Mesosphere; Meteor radar
Issue Date
2010
Citation
Kim, Jeong-Han, et al. 2010. Seasonal and height variation of gravity wave activities observed by a meteor radar at King Sejong Station (62°S, 57°W), Antarctica. American Geophysical Union. American Geophysical Union. 2010.12.16~.
Abstract
We have analyzed wind data from individual meteor echoes detected by a meteor radar at King Sejong Station, Antarctica to measure gravity wave activity in the mesopause region. Wind data in the meteor altitudes has been obtained routinely by the meteor radar since its installation in March 2007. The mean variances in the wind data that were filtered for large scale motions (mean winds and tides) can be regarded as the gravity wave activity. Monthly mean gravity wave activities show strong seasonal and height dependences in the altitude range of 80 to 100 km. The gravity wave activities except summer monotonically increase with altitude, which is expected since decreasing atmospheric densities cause wave amplitudes to increase. During summer (Dec. - Feb.) the height profiles of gravity wave activities show a minimum near 90 - 95 km, which may be due to different zonal wind and strong wind shear near 80 - 95 km. Our gravity wave activities are generally stronger than those of the Rothera station, implying sensitive dependency on location. The difference may be related to gravity wave sources in the lower atmosphere near Antarctic vortex.
URI
http://repository.kopri.re.kr/handle/201206/8524
Conference Name
American Geophysical Union
Conference Place
American Geophysical Union
Conference Date
2010.12.16~
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