期刊
JOURNAL OF GLACIOLOGY
卷 64, 期 245, 页码 362-376出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jog.2018.28
关键词
calving; glacier monitoring; glaciological instruments and methods
资金
- Japan Society for the Promotion of Science [JP23403006, JP26550001, JP16H05734, JP16J01860]
- Inoue Found for Field Science of the Japanese Society of Snow and Ice
- Grants-in-Aid for Scientific Research [16J01860] Funding Source: KAKEN
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 similar to 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.
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