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

Yoshiaki Ishihara, Masaki Kanao, Masa Yuki Yamamoto, Shigeru Toda, Takeshi Matsushima, Takahiko Murayama

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)285-296
Number of pages12
JournalGeoscience Frontiers
Volume6
Issue number2
DOIs
Publication statusPublished - Mar 1 2015

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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