Gravity wave momentum flux (GWMF) in the stratosphere estimated from temperature perturbation using satellite data is found to be maximal in the Antarctic Peninsula in wintertime. To understand contributions of GWs to large-scale circulations in the Antarctic where climate change is proceeding faster than elsewhere, understanding sources and propagation process of GWs in this area is required. In the present study, we analyzed GWs in the upper mesosphere, which have been observed from VHF meteor radar at King Sejong Station (KSS), Antarctica (62.22°S, 58.78°W) during last 8 years (2007–2014), and their correlation with the jet stream in the troposphere and stratosphere is investigated. The GWs in the upper mesosphere (80–100 km altitude range) are examined using hourly averaged wind variance observed from the meteor radar, after filtering out the diurnal and semi-diurnal components of tides. GW activities in the troposphere and stratosphere are also investigated using the GWMF estimated from the high-resolution ECMWF analysis data. To examine the correlation between GWs in the mesosphere and the jet stream, the residual of nonlinear balance equation (△NBE) in the troposphere and stratosphere is calculated using the ERA-interim reanalysis data. GWs in the mesosphere have maximum in May and minimum in February above 90 km, while they are in April and December below 90 km, respectively. Significant positive correlation between △NBE in the lower atmosphere and the observed GWs above 90 km, as well as the absolute GWMF in the stratosphere, is shown in July. Sources of the GWs that observed in the upper mesosphere are examined by backward integration of a 3-dimentional GW ray-tracing model, with wave characteristics observed from airglow at KSS.

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*email: songbg@yonsei.ac.kr
*Preference: Oral