TITLE:
Infrasound Signals in Coastal Environment at Jang Bogo Station, Terra Nova Bay, Antarctica
AUTHORS:
Masaki Kanao, Takahiko Murayama, Yongcheol Park
KEYWORDS:
Infrasound Signals, Antarctica, Terra Nova Bay, Microbaroms, Surface Environment
JOURNAL NAME:
International Journal of Geosciences,
Vol.13 No.12,
December
30,
2022
ABSTRACT: Infrasound signals in Antarctica reflect physical
interaction in the surface environments around the recorded area. In December
2015, an infrasound array by three sensors in the detectable frequency range of
0.1 - 200 Hz, combined with one broadband barometer was deployed at Jang Bogo
Station, Terra Nova Bay, Antarctica. The two years of data by the broadband barometer contain characteristic signals that caused by surface environment nearby the station, mixing with local
noises such as katabatic winds. Clear continuous signals by oceanic swells
(microbaroms) were recorded with a predominant
frequency of around 0.2 s. Variations of frequency context and amplitudes in the Power
Spectral Density were considered as affected by sea-ice dynamics surrounding
the Terra Nova Bay. Monitoring of microbaroms could contribute to understanding ocean wave climate, with other oceanographic, cryospheric and geophysical
data in Antarctica. Infrasound data in Terra Nova Bay might be a new proxy for
estimating environmental variations affected by global warming, cryosphere
dynamics, together with volcanic eruptions in Victoria Land.