Infrasound observations at Syowa Station, East Antarctica: Implications for detecting the surface environmental variations in the polar regions

• Published in: Geoscience Frontiers
• Main Authors: Yoshiaki Ishihara, Masaki Kanao, Masa-yuki Yamamoto, Shigeru Toda, Takeshi Matsushima, Takahiko Murayama
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2015
• Subjects: Infrasound; Antarctica; Microbaroms; Environment; Global network; Geology; QE1-996.5; Antarctic; Austral; East Antarctica; Lützow-Holm Bay; Syowa Station; The Antarctic; Antarc*; International Polar Year; SCAR; Scientific Committee on Antarctic Research; Sea ice
• Online Access: https://doi.org/10.1016/j.gsf.2013.12.012; https://doaj.org/article/cda6c3906c9949a089f1ef0c10734dac

Characteristic infrasound waves observed at Antarctic stations demonstrate physical interaction involving environmental changes in the Antarctic continent and the surrounding oceans. A Chaparral-type infrasound sensor was installed at Syowa Station (SYO; 39°E, 69°S), East Antarctica, as one of the projects of the International Polar Year (IPY2007‒2008). Data continuously recorded during the three seasons in 2008–2010 clearly indicate a contamination of the background oceanic signals (microbaroms) with peaks between 4 and 10 s observed during a whole season. The peak amplitudes of the microbaroms have relatively lower values during austral winters, caused by a larger amount of sea-ice extending around the Lützow-Holm Bay near SYO, with decreasing ocean wave loading effects. Microbaroms measurements are useful tool for characterizing ocean wave climate, complementing other oceanographic and geophysical data. A continuous monitoring by infrasound sensors in the Antarctic firmly contributes to the Comprehensive Nuclear-Test-Ban Treaty (CTBT) in the southern high latitude, together with the Pan-Antarctic Observations System (PAntOS) under the Scientific Committee on Antarctic Research (SCAR). Detailed measurements of the infrasound waves in Antarctica, consequently, could be a new proxy for monitoring regional environmental change as well as the temporal climate variations in the polar regions.