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"Icebergs."
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Icebergs : their science and links to global change
\"Icebergs are a prime example of an environmental phenomenon that brings together multiple disciplines in the polar sciences, from the physics of calving and melting to the geology of their solid deposits and sea floor interactions. Icebergs are also increasingly seen to play key roles in past and present climate change through addition of freshwater to the ocean, in providing invaluable information through their debris, in fertilising the polar oceans, and as an increasing hazard to Arctic travel and development\"-- Provided by publisher.
Book
Chasing icebergs : how frozen freshwater can save the planet
\"Harvesting icebergs for drinking water is not a new idea. But for the first time in human history, doing so on a massive global scale is both increasingly feasible and necessary for our survival. Chasing Icebergs delivers a kaleidoscopic history of humans' relationship with icebergs, and offers an urgent assessment of the technological, cultural, and legal obstacles we must overcome to harness this freshwater resource\"-- Provided by publisher.
Book
Ocean-driven thinning enhances iceberg calving and retreat of Antarctic ice shelves
Iceberg calving from all Antarctic ice shelves has never been directly measured, despite playing a crucial role in ice sheet mass balance. Rapid changes to iceberg calving naturally arise from the sporadic detachment of large tabular bergs but can also be triggered by climate forcing. Here we provide a direct empirical estimate of mass loss due to iceberg calving and melting from Antarctic ice shelves. We find that between 2005 and 2011, the total mass loss due to iceberg calving of 755 ± 24 gigatonnes per year (Gt/y) is only half the total loss due to basal melt of 1516 ± 106 Gt/y. However, we observe widespread retreat of ice shelves that are currently thinning. Net mass loss due to iceberg calving for these ice shelves (302 ± 27 Gt/y) is comparable in magnitude to net mass loss due to basal melt (312 ± 14 Gt/y). Moreover, we find that iceberg calving from these decaying ice shelves is dominated by frequent calving events, which are distinct from the less frequent detachment of isolated tabular icebergs associated with ice shelves in neutral or positive mass balance regimes. Our results suggest that thinning associated with ocean-driven increased basal melt can trigger increased iceberg calving, implying that iceberg calving may play an overlooked role in the demise of shrinking ice shelves, and is more sensitive to ocean forcing than expected from steady state calving estimates.
Significance The floating parts of the Antarctic ice sheet (“ice shelves”) help to hold back the flow of the grounded parts, determining the contribution to global sea level rise. Using satellite images, we measured, for the first time, all icebergs larger than 1 km ² calving from the entire Antarctic coastline, and the state of health of all the ice shelves. Some large ice shelves are growing while many smaller ice shelves are shrinking. We find high rates of iceberg calving from Antarctic ice shelves that are undergoing basal melt-induced thinning, which suggests the fate of ice shelves may be more sensitive to ocean forcing than previously thought.
Journal Article
Icebergs & glaciers
Discusses the formation, movement, and different types of glaciers and icebergs and describes their effect on the world around them.
Book
Grounding Event of Iceberg D28 and Its Interactions with Seabed Topography
Iceberg D28, a giant tabular iceberg that calved from Amery Ice Shelf in September 2019, grounded off Kemp Coast, East Antarctica, from August to September of 2020. The motion of the iceberg is characterized herein by time-series images captured by synthetic aperture radar (SAR) on Sentinel-1 and the moderate resolution imaging spectroradiometer (MODIS) boarded on Terra from 6 August to 15 September 2020. The thickness of iceberg D28 was estimated by utilizing data from altimeters on Cryosat-2, Sentinel-3, and ICESat-2. By using the iceberg draft and grounding point locations inferred from its motion, the maximum water depths at grounding points were determined, varying from 221.72 ± 21.77 m to 269.42 ± 25.66 m. The largest disagreements in seabed elevation inferred from the grounded iceberg and terrain models from the Bedmap2 and BedMachine datasets were over 570 m and 350 m, respectively, indicating a more complicated submarine topography in the study area than that presented by the existing seabed terrain models. Wind and sea water velocities from reanalysis products imply that the driving force from sea water is a more dominant factor than the wind in propelling iceberg D28 during its grounding, which is consistent with previous findings on iceberg dynamics.
Journal Article
Chilly da Vinci
When one of Chilly da Vinci's inventions separates a chunk of ice from his home iceberg, he must invent something quickly to get himself and the other penguins back home.
Book
