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Glacier calving observed with time-lapse imagery and tsunami waves at Glaciar Perito Moreno, Patagonia

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Title: Glacier calving observed with time-lapse imagery and tsunami waves at Glaciar Perito Moreno, Patagonia
Authors: Minowa, Masahiro Browse this author →KAKEN DB
Podolskiy, Evgeny A. Browse this author
Sugiyama, Shin Browse this author →KAKEN DB
Sakakibara, Daiki Browse this author
Skvarca, Pedro Browse this author
Keywords: calving
glacier monitoring
glaciological instruments and methods
Issue Date: 12-Apr-2018
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 64
Issue: 245
Start Page: 362
End Page: 376
Publisher DOI: 10.1017/jog.2018.28
Abstract: Calving plays a key role in the recent rapid retreat of glaciers around the world. However, many processes related to calving are poorly understood since direct observations are scarce and challenging to obtain. When calving occurs at a glacier front, surface-water waves arise over the ocean or a lake in front of glaciers. To study calving processes from these surface waves, we performed field observations at Glaciar Perito Moreno, Patagonia. We synchronized time-lapse photography and surface waves record to confirm that glacier calving produces distinct waves compared with local noise. A total of 1074 calving events were observed over the course of 39 d. During austral summer, calving occurred twice more frequently than in spring. The cumulative distribution of calving-interevent time interval followed exponential model, implying random occurrence of events in time. We further investigated wave properties and found that source-to-sensor distance can be estimated from wave dispersion within ∼20% error. We also found that waves produced by different calving types showed similar spectra in the same frequency range between 0.05–0.2 Hz, and that the amplitude of surface waves increased with the size of calving. This study demonstrates the potential of surface-wave monitoring for understanding calving processes.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 箕輪 昌紘

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