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Characteristics of inertia-gravity waves revealed in rawinsondes at Jang Bogo Station (JBS), Antarctica (74.374S, 164.137E)

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Title
Characteristics of inertia-gravity waves revealed in rawinsondes at Jang Bogo Station (JBS), Antarctica (74.374S, 164.137E)
Other Titles
남극 장보고 기지 레윈존데에서 나타난 관성중력파의 특성
Authors
Yoo, Ji-hee
Choi, Choi
Chun, Hye-Yeong
Kim, Young-Ha
Song, In-Sun
Song, Byeong-Gwon
Keywords
AntarticaInertia-gravity wavesRawinsonde
Issue Date
2018
Citation
Yoo, Ji-hee, et al. 2018. Characteristics of inertia-gravity waves revealed in rawinsondes at Jang Bogo Station (JBS), Antarctica (74.374S, 164.137E). SPARC General Assembly 2018. Kyoto. 2018.10.01~2018.10.05.
Abstract
High-resolution radiosonde data obtained at Jang Bogo Station (74˚37’S, 164˚13’E) are used to investigate characteristics and sources of inertia-gravity waves (IGWs) in the troposphere (z = 27 km) and the lower stratosphere (z = 1522 km) for 25 months (Dec. 2014Dec. 2016). In the stratosphere, most of IGWs propagate upward, while from May to October, down-going IGWs increase with reduction of up-going IGWs. In the troposphere, 60 (40) % of IGWs propagate upward (downward) without seasonal variations. Most of the observed IGWs in the stratosphere propagate eastward significantly, while this feature is less evident in the troposphere. The average intrinsic frequency, vertical wavelength, and horizontal wavelength of IGWs in the troposphere (stratosphere) are 3.48f (1.94f) (where f is the Coriolis parameter), 1.48 km (1.48 km), and 67.17 km (222.94 km), respectively. Intrinsic frequency and vertical wavelength in the stratosphere show clear seasonal variations with an increase (decrease) from autumn to winter (spring to summer), resulting corresponding horizontal wavelength increasing (decreasing) from spring to summer (autumn to winter), while the variations are not shown in the troposphere. Wave energy in the stratosphere has clear seasonal variations with the maximum in August (6.2 J kg-1) and minimum in January (2.5 kg-1), while tropospheric ones have much smaller energy without seasonal variations. The momentum flux (MF) of up-going IGWs in the stratosphere is more negative (positive) in zonal (meridional) direction, while that of down-going IGWs is mostly positive for both directions. Potential sources of the observed IGWs are examined. First, several mountains located on the west of JBS can generate up-going IGWs with small ground-based phase speed when the critical level filtering does not occur. Second, synoptic-scale disturbance near the tropopause is likely to generate the down-going (up-going) GWs in the troposphere (stratosphere). Third, the polar-night jet in the stratosphere, which locates at 50˚S70˚S can be an important source inducing down-going GWs. Considering that the observed IGWs can propagate significantly in horizontal direction, tropical convection can also be a possible source. The possibility will be assessed by gravity-wave MF by convection shown in Kang et al. (2017). These sources will be identified using 3-dimensional ray-tracing model of GWs.
URI
https://repository.kopri.re.kr/handle/201206/12671
Conference Name
SPARC General Assembly 2018
Conference Place
Kyoto
Conference Date
2018.10.01~2018.10.05
Type
Proceeding
Indexed
Pro(FULL)국제
Appears in Collections  
2017-2018, Understanding polar upper atmospheric changes by energy inputs from the space environment and the lower atmosphere (17-18) / Jee, Geonhwa (PE17020; PE18020)
2018-2018, Understanding polar upper atmospheric changes by energy inputs from the space environment and the lower atmosphere (18-18) / Jee, Geonhwa (PE18020)
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