[A-AS10] 成層圏・対流圏過程とその気候への影響

[AAS10-03] Preliminary results of LODEWAVE

*冨川 喜弘^1,2、佐藤 薫³、斎藤 芳隆⁴、村田 功⁵、平沢 尚彦^1,2、高麗 正史³、中篠 恭一⁶、秋田 大輔⁷、松尾 卓摩⁸、藤原 正智⁹、吉田 理人² (1.国立極地研究所、2.総合研究大学院大学、3.東京大学、4.宇宙航空研究開発機構、5.東北大学、6.東海大学、7.東京工業大学、8.明治大学、9.北海道大学)

キーワード：南極、大気重力波、スーパープレッシャー気球、PANSYレーダー

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.