globalchange  > 气候变化与战略
DOI: 10.1038/s41561-021-00767-4
论文题名:
Submarine landslides triggered by iceberg collision with the seafloor
作者: Normandeau A.; MacKillop K.; Macquarrie M.; Richards C.; Bourgault D.; Campbell D.C.; Maselli V.; Philibert G.; Clarke J.H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期:8
起始页码: 599
结束页码: 605
语种: 英语
英文摘要: Iceberg discharge influences ocean circulation, affects climate and increases global sea level. Icebergs are also known to gouge the seafloor in water depths limited by their keel depth, thus representing a hazard to subsea infrastructure. Here, we provide evidence that icebergs can affect the seafloor at depths greater than their keel depth by triggering submarine landslides. Using repeat bathymetric surveys from multibeam echo sounders, we investigate the cause of a submarine landslide that occurred in Southwind Fjord, Baffin Island, between September 2018 and September 2019. This landslide is shown to be closely associated with recently formed iceberg pits at its headscarp carved by an iceberg that grounded and that capsized in the fjord in early September 2018. Geotechnical data from a nearby sediment core indicate that the vertical loading induced by the iceberg grounding and capsizing is sufficient to trigger the observed landslide. These results imply that icebergs originating from the Arctic, Greenland and Antarctica are hazards thousands of kilometres away from their original source and can affect continental slopes by triggering submarine landslides. This process represents an additional source of marine geohazards, especially if climate change leads to increased iceberg discharge. © 2021, Crown.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169800
Appears in Collections:气候变化与战略

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作者单位: Geological Survey of Canada (Atlantic), Natural Resources Canada, Bedford Institute of Oceanography, Dartmouth, NS, Canada; Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, NS, Canada; Institut des Sciences de la Mer, Université du Québec à Rimouski, Rimouski, QC, Canada; Department of Earth and Environmental Sciences, Dalhousie University, Halifax, NS, Canada; Center for Coastal and Ocean Mapping, University of New Hampshire, Durham, NH, United States

Recommended Citation:
Normandeau A.,MacKillop K.,Macquarrie M.,et al. Submarine landslides triggered by iceberg collision with the seafloor[J]. Nature Geoscience,2021-01-01,14(8)
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