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Article
Open AccessA seasonally ice-free Arctic Ocean during the Last Interglacial
The extent and seasonality of Arctic sea ice during the Last Interglacial (129,000 to 115,000 years before present) is poorly known. Sediment-based reconstructions have suggested extensive ice cover in summer,...
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Article
Open AccessSeasonal sea-ice in the Arctic’s last ice area during the Early Holocene
According to climate models, the Lincoln Sea, bordering northern Greenland and Canada, will be the final stronghold of perennial Arctic sea-ice in a warming climate. However, recent observations of prolonged p...
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Article
Open AccessOrganic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
Subsea permafrost represents a large carbon pool that might be or become a significant greenhouse gas source. Scarcity of observational data causes large uncertainties. We here use five 21-56 m long subsea per...
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Article
Open AccessAnaerobic oxidation has a minor effect on mitigating seafloor methane emissions from gas hydrate dissociation
Continental margin sediments contain large reservoirs of methane stored as gas hydrate. Ocean warming will partly destabilize these reservoirs which may lead to the release of substantial, yet unconstrained, a...
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Article
Open AccessThe International Bathymetric Chart of the Southern Ocean Version 2
The Southern Ocean surrounding Antarctica is a region that is key to a range of climatic and oceanographic processes with worldwide effects, and is characterised by high biological productivity and biodiversit...
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Article
Open AccessPetermann ice shelf may not recover after a future breakup
Floating ice shelves buttress inland ice and curtail grounded-ice discharge. Climate warming causes melting and ultimately breakup of ice shelves, which could escalate ocean-bound ice discharge and thereby sea...
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Article
Open AccessThe climate sensitivity of northern Greenland fjords is amplified through sea-ice damming
Record-high air temperatures were observed over Greenland in the summer of 2019 and melting of the northern Greenland Ice Sheet was particularly extensive. Here we show, through direct measurements, that near ...
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Article
Open AccessRyder Glacier in northwest Greenland is shielded from warm Atlantic water by a bathymetric sill
The processes controlling advance and retreat of outlet glaciers in fjords draining the Greenland Ice Sheet remain poorly known, undermining assessments of their dynamics and associated sea-level rise in a war...
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Article
Open AccessThe International Bathymetric Chart of the Arctic Ocean Version 4.0
Bathymetry (seafloor depth), is a critical parameter providing the geospatial context for a multitude of marine scientific studies. Since 1997, the International Bathymetric Chart of the Arctic Ocean (IBCAO) h...
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Article
Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes
Calcareous microfossil assemblages in late Holocene sediments from the western Arctic continental shelf provide an important baseline for evaluating the impacts of today’s changing Arctic oceanography. This st...
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Article
Open AccessSedimentary proxies for Pacific water inflow through the Herald Canyon, western Arctic Ocean
Pacific water inflow to the Arctic Ocean occurs through the shallow Bering Strait. With a present sill depth of only 53 m, this gateway has been frequently closed during glacial sea-level low stands of the Ple...
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Article
Open AccessThe Holocene retreat dynamics and stability of Petermann Glacier in northwest Greenland
Submarine glacial landforms in fjords are imprints of the dynamic behaviour of marine-terminating glaciers and are informative about their most recent retreat phase. Here we use detailed multibeam bathymetry t...
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Article
Open AccessAcoustic Map** of Thermohaline Staircases in the Arctic Ocean
Although there is enough heat contained in inflowing warm Atlantic Ocean water to melt all Arctic sea ice within a few years, a cold halocline limits upward heat transport from the Atlantic water. The amount o...
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Article
Evidence of marine ice-cliff instability in Pine Island Bay from iceberg-keel plough marks
Plough marks in Pine Island Bay, West Antarctica, left by the keels of drifting icebergs 12,000 years ago provide evidence that marine ice-cliff instability can drive rapid ice-sheet retreat.
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Article
Dimmuborgir: a rootless shield complex in northern Iceland
The origin of Dimmuborgir, a shield-like volcanic structure within the Younger Laxá lava flow field near Lake Mývatn, in northern Iceland, has long been questioned. New airborne laser map** (light detection ...
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Article
Open AccessEvidence for an ice shelf covering the central Arctic Ocean during the penultimate glaciation
The hypothesis of a km-thick ice shelf covering the entire Arctic Ocean during peak glacial conditions was proposed nearly half a century ago. Floating ice shelves preserve few direct traces after their disapp...
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Reference Work Entry In depth
International Bathymetric Chart of the Arctic Ocean (IBCAO)
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Article
Open AccessArsenic stress after the Proterozoic glaciations
Protection against arsenic damage in organisms positioned deep in the tree of life points to early evolutionary sensitization. Here, marine sedimentary records reveal a Proterozoic arsenic concentration patter...
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Living Reference Work Entry In depth
International Bathymetric Chart of the Arctic Ocean (IBCAO)
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Article
Acoustic evidence of a submarine slide in the deepest part of the Arctic, the Molloy Hole
The western Svalbard continental margin contains thick sediment sequences with areas known to contain gas hydrates. Together with a dynamic tectonic environment, this makes the region prone to submarine slides...
