日本地球惑星科学連合2018年大会

講演情報

[EE] Eveningポスター発表

セッション記号 U (ユニオン) » ユニオン

[U-03] Cryoseismology - a new proxy for detecting surface environmental variations of the Earth -

2018年5月24日(木) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:豊国 源知(東北大学 大学院理学研究科 地震・噴火予知研究観測センター)、金尾 政紀(国立極地研究所)、坪井 誠司(海洋研究開発機構)

[U03-P01] Characteristic atmosphere and ocean interaction in the coastal and marine environment inferred from infrasound at Terra Nova Bay, Antarctica - observation and initial data -

*村山 貴彦2金尾 政紀1山本 真行3石原 吉明4大井 拓磨5 (1.国立極地研究所、2.日本気象協会、3.高知工科大学、4.宇宙航空研究開発機構、5.東邦マーカンタイル株式会社)

Characteristic features of infrasound waves observed in the Antarctic reveal physical interaction involving surface environments around the continent and Southern Ocean. In December 2015, an infrasound array (100 m spacing) by three sensors (Chaparral Physics Model 25, with a detectable frequency range of 0.1-200 Hz), together with a broadband barometer (Digiquartz Nano-Resolution Model 6000-16B Barometer, with a detectable frequency range of 0-22 Hz) were installed at Jang Bogo Staion, Terra Nova Bay, Antarctica by the Korea Arctic and Antarctic Research Program (KAARP). The initial data recorded by the broadband barometer contain characteristic signals originated by surrounding environment, including local noises such as katabatic winds. Clear oceanic signals (microbaroms) are continuously recorded as the background noises with predominant frequency around 0.2 s at the austral summer on December. Variations in their frequency context and amplitude strength in Power Spectral Density had been affected by an evolution of sea-ice surrounding the Terra Nova Bay. Microbaroms measurement is a useful tool for characterizing ocean wave climate, complementing other oceanographic, cryospheric and geophysical data in the Antarctic. Continuous infrasound observations in Terra Nova Bay attain a new proxy for monitoring environmental changes such as the global warming, involving cryosphere dynamics, as well as the volcanic eruptions in Northern Victoria Land, Antarctica.