Infrasound observation at JapaneseAntarctic Station "Syowa": 11 years observations and results

Infrasound observation at Syowa Station (SYO), Antarcticastarted as one of the projects related International Polar Year (IPY2007 - 2008) as one-sensor pilot observation, and after the pilot observation, we then migrateto 3-sensor arrayed observation. The obtained 11 years infrasound data enable us to examine characteristics of infrasound behavior around SYO. Spectralanalysis of recorded data clearly shows continuous arrivals of microbaroms fromsouthern ocean and weak annual change of the energy. Array analysis of the 3-sensor observation data detected infrasound signals generated by ice-relatedactivities around SYO.南极昭和站（Syowa Station, SYO）的次声（Infrasound）观测项目，最初作为2007-2008年国际极地年（International Polar Year, IPY）相关研究内容之一，以单传感器试点观测的形式启动。试点观测完成后，研究团队将观测系统升级为三传感器阵列观测。本次研究所获取的11年次声观测数据，可用于探究昭和站周边次声活动的特征。对观测记录开展的频谱分析清晰显示，南大洋持续产生微压波（microbaroms）信号并持续传入观测站点，且该信号的能量存在微弱的年际变化。基于三传感器阵列观测数据的阵列分析，成功探测到昭和站周边由冰体相关活动产生的次声信号。