Iceberg-capsize tsunamigenesis
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In this article, the authors investigated iceberg-capsize energetics, and developed a rule relating tsunami height to iceberg thickness, which suggests that the open-water tsunami height (located far from the iceberg and from shorelines where the height can be amplified) has an upper limit of 0.01H where H is the initial vertical dimension of the iceberg.Abstract:
Calving from the floating termini of outlet glaciers and ice shelves is just the beginning of an interesting chain of events that can subsequently have important impacts on human life and property. Immediately after calving, many icebergs capsize (roll over by 90 ◦ ) due to the instability of their initial geometry. As icebergs melt and respond to the cumulative effects of ocean swell, they can also reorient their mass distribution by further capsize and fragmentation. These processes release gravitational potential energy and can produce impulsive large-amplitude surface-gravity waves known as tsunamis (a term derived from the Japanese language). Iceberg-capsize tsunamis in Greenland fjords can be of sufficient amplitude to threaten human life and cause destruction of property in settlements. Iceberg-capsize tsunamis may also have a role in determining why some ice shelves along the Antarctic Peninsula disintegrate 'explosively' in response to general environmental warming. To quantify iceberg tsunami hazards we investigate iceberg-capsize energetics, and develop a rule relating tsunami height to iceberg thickness. This rule suggests that the open-water tsunami height (located far from the iceberg and from shorelines where the height can be amplified) has an upper limit of 0.01H where H is the initial vertical dimension of the iceberg.read more
Citations
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Antarctic ice shelf disintegration triggered by sea ice loss and ocean swell
Robert A. Massom,Robert A. Massom,Ted Scambos,Luke G. Bennetts,Phillip Reid,Phillip Reid,Vernon A. Squire,Sharon Stammerjohn +7 more
TL;DR: It is shown that for the disintegration events observed, the increased seasonal absence of a protective sea ice buffer enabled increased flexure of vulnerable outer ice shelf margins by ocean swells that probably weakened them to the point of calving.
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Breakup of the Larsen B Ice Shelf triggered by chain reaction drainage of supraglacial lakes
TL;DR: In this paper, the U.S. National Science Foundation under grant GEOP/ANT (0944248) and grant ANT-0838811 and ARC-0934534 were used to support the work of O.V.R.
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Isolation basins, sea-level changes and the Holocene history of the Greenland Ice Sheet
TL;DR: In this paper, a new relative sea-level (RSL) curve from Disko Fjord, West Greenland is presented, which shows that local ice free conditions were established at c. 11k cal/yr BP, after which RSL fell rapidly from a marine limit atc. 80m to reach close to present sea level by c. 4k cal /yr BP.
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A two-phase mechanical model for rock-ice avalanches
TL;DR: In this article, a two-phase mass flow model was proposed to better address the dynamic interaction of solid (rock and ice) and fluid (water, snow, slurry, and fine particles) than presently used single-phase Voellmy- or Coulomb-type models.
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Seasonal and interannual variations in ice melange and its impact on terminus stability, Jakobshavn Isbræ, Greenland
TL;DR: In this article, satellite-derived surface temperatures and time-lapse photography were used to infer temporal variations in the proglacial ice melange at Jakobshavn Isbrae, a large and rapidly retreating outlet glacier in Greenland.
References
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TL;DR: In this paper, the authors used satellite images to examine the calving behavior of Helheim and Kangerdlugssuaq glaciers, Greenland, from 2001 to 2006, a period in which they retreated and sped up.