Long-Term Variations in Infrasound Signals Observed at Syowa Station, Antarctica: 2008-2014 - InfraMatics

InfraMatics > Vol.3 No.1, March 2017

Long-Term Variations in Infrasound Signals Observed at Syowa Station, Antarctica: 2008-2014 ()

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DOI: 10.4236/inframatics.2017.31001 1,045 Downloads 1,930 Views Citations

Author(s)

Yoshiaki Ishihara^1*, Masa-Yuki Yamamoto², Takahiko Murayama³, Takeshi Matsushima⁴, Masaki Kanao⁵

Affiliation(s)

¹Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara-shi, Japan.
²Kochi University of Technology, Kami-shi, Japan.
³Japan Weather Association, Tokyo, Japan.
⁴Faculty of Sciences, Kyushu University, Nagasaki, Japan.
⁵National Institute of Polar Research, Research Organization of Information and Systems, Tokyo, Japan.

ABSTRACT

Long-term Infrasound data at Syowa Station (SYO; 39E, 69S), in the Lützow-Holm Bay (LHB), East Antarctica was analyzed during the period from 2008 to 2014. Seasonal variations in microbaroms and high-frequency harmonic tremors were especially investigated. Infrasound data were strongly involved in local dynamics of surface environments. The microbaroms have relatively low amplitudes in austral winters by extending area of sea-ice around LHB, with decreasing oceanic swell loading effects. The other reasons of seasonal variations in microbaroms amplitudes were caused by the affections of a number of storms during whole year and snow accumulation over the porous hoses on the infrasound station at SYO. In contrast, non-linear high-frequency harmonic tremors were considered to be caused by the katabatic winds from Antarctic continent flowing in northeast dominant orientation. The high-frequency tremors had characteristics of daily variations in particular in austral summer. It is required to continue more than a few years of observation in order to identify relationships with climate change and global warming effects in the Antarctic. Continuous measurement of infrasound in the coastal margin of Antarctica is a proxy for monitoring multi-sphere interaction between the continent and surrounding Southern Ocean.

KEYWORDS

Infrasound, Long-Term Monitoring, Antarctica, Surface Environment, Microbaroms, High-Frequency Tremors

Share and Cite:

Ishihara, Y., Yamamoto, M.-Y., Murayama, T., Matsushima, T. and Kanao, M. (2017) Long-Term Variations in Infrasound Signals Observed at Syowa Station, Antarctica: 2008-2014. InfraMatics, 3, 1-10. doi: 10.4236/inframatics.2017.31001.

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