[A-AS10] Stratosphere-troposphere Processes And their Role in Climate

[AAS10-03] Preliminary results of LODEWAVE

*Yoshihiro Tomikawa^1,2, Kaoru Sato³, Yoshitaka Saito⁴, Isao Murata⁵, Naohiko Hirasawa^1,2, Masashi Kohma³, Kyoichi Nakashino⁶, Daisuke Akita⁷, Takuma Matsuo⁸, Masatomo Fujiwara⁹, Lihito Yoshida² (1.National Institute of Polar Research, 2.The Graduate University for Advanced Studies, SOKENDAI, 3.The University of Tokyo, 4.Japan Aerospace Exploration Agency, 5.Tohoku University, 6.Tokai University, 7.Tokyo Institute of Technology, 8.Meiji University, 9.Hokkaido University)

Keywords:Antarctic, Atmospheric gravity wave, Super pressure balloon, PANSY radar

Atmospheric gravity waves transport momentum in the atmosphere and play an important role in determining temperature and material distribution through driving the meridional circulation in the middle atmosphere. However, they have wide spatial and temporal scales, which make it difficult to capture the whole feature of gravity waves with any of the latest observations and models. The first Mesosphere-Stratosphere-Troposphere (MST)/ Incoherent Scatter (IS) radar in the Antarctic, PANSY, which was installed at Syowa Station in 2011, can directly estimate the momentum flux of gravity waves in all frequency bands by observing 3-dimensional winds with high precision and high resolution. On the other hand, the super pressure (SP) balloon observation can also estimate momentum transport due to gravity waves in all frequency bands, and its horizontal distribution is also clarified. In order to carry out this SP balloon observation in the Antarctic where the observational constraint on the momentum transport due to gravity waves is especially insufficient, we proposed the LOng-Duration balloon Experiment of gravity WAVE over Antarctica (LODEWAVE). By combining it with the PANSY observation and the state-of-the-art meteorological reanalysis data, the 3-dimensional picture of momentum transport due to gravity waves is acquired, which contributes to the improvement of the future prediction by the climate model.
The first campaign observation of LODEWAVE was performed in January and February 2022 at Antarctic Syowa Station. We will present the preliminary results of the first LODEWAVE campaign.