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Infrasonic Waves in Antarctica: A New Proxy for Monitoring Polar Environment

International Journal of Geosciences 2013年第4期4卷 797-802页

作者： Masa-Yuki Yamamoto Yoshiaki Ishihara Masaki Kanao Kochi University of Technology Kami-shi Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan National Institute of Polar Research Tokyo Japan

Characteristic infrasound waves are clearly recorded at Syowa Station (SYO), East Antarctica, involving physical interaction in surrounding environments at the continent and SouthernOcean. A Chaparral microphone type infrasound sensor is deployed at SYO during the International Polar Year (IPY2007-2008), the most diverse international science program held recently. Continuous recorded data in 2008-2010 indicate a contamination of background oceanic signals (microbaroms). The characteristic signals are identified as the “microbaroms” with peaks between 4 and 10 s in the records. The peak amplitudes of microbaroms may be enhanced by the extratropical cyclonic storms and wind noises in Southern Ocean. The microbaroms has relatively lower amplitudes during austral winters, which may be caused by the larger amount of the sea-ice extent around theLützow-HolmBaynear SYO, with decreasing the ocean wave loading effects. In addition, the large energy with intrinsic periods between 12 and 30 s are observable under excellent storm conditions, particularly in local winter. The oceanic effects appearing on infrasound data are modulated by the presence of sea-ice and explained by a relationship between the atmosphere-ocean-cryosphere systems. microbaroms measurements could be a useful tool for characterizing ocean wave climate, as well as a new proxy for monitoring a regional environmental variation inAntarctica.

关键词： Infrasound Antarctica microbaroms Environmental Monitoring Global Network

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Infrasound Signals and Their Source Location Inferred from Array Deployment in the Lützow-Holm Bay Region, East Antarctica: January-June 2015

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International Journal of Geosciences 2017年第2期8卷 181-188页

作者： Takahiko Murayama Masaki Kanao Masa-Yuki Yamamoto Yoshiaki Ishihara Japan Weather Association Tokyo Japan National Institute of Polar Research Research Organization of Information and Systems Tokyo Japan Kochi University of Technology Kochi Japan Japan Aerospace Exploration Agency Tokyo Japan

Characteristic features of infrasound waves observed in the Antarctic represent a physical interaction relating surface environment in the continental margin and surrounding Southern Ocean. Source location of several infrasound events is demonstrated by using combination of two array deployments along a coast of the Lützow-Holm Bay (LHB), East Antarctica, for data retrieving period in January-June 2015. These infrasound arrays being established in January 2013 clearly detected temporal variations in frequency content and propagation direction of the identified seven large events. Many of these sources are assumed to have cryoseismic origins;the ice-quakes associated with calving of glaciers, discharge of sea-ice, collision between sea-ice and icebergs around the LHB. Detail and continuous measurements of infrasound waves in the Antarctic are a proxy for monitoring regional environment as well as climate change in high southern latitude.

关键词： Infrasound Array Observations Lützow-Holm Bay East Antarctica microbaroms Ice Shocks Surface Environment

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Infrasound Signals in Coastal Environment at Jang Bogo Station, Terra Nova Bay, Antarctica

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International Journal of Geosciences 2022年第12期13卷 1103-1114页

作者： Masaki Kanao Takahiko Murayama Yongcheol Park Research Organization of Information and Systems National Institute of Polar Research Tokyo Japan Japan Weather Association Tokyo Japan Korea Polar Research Institute Incheon Republic of Korea

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.

关键词： Infrasound Signals Antarctica Terra Nova Bay microbaroms Surface Environment

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