Sedimentary environments in the south-western Barents Sea during the last deglaciation and the Holocene: a case study outside the Ingøydjupet trough

Pau, M.; Hammer, Øyvind

doi:10.3402/polar.v35.23104

Cited by 3 publications

(2 citation statements)

References 53 publications

(84 reference statements)

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“…The average C/N = 18.8 ± 1.2 (SD; n = 21), δ 13 C org = −25.1‰ ± 0.3‰ (SD; n = 21) and δ 15 N = 3.3‰ ± 0.5‰ (SD; n = 21) (Fig. 2 ) together with the laminated sedimentation pattern are consistent with suspension settling from meltwater plumes in a glaciomarine environment 36 , 37 . Pebbles are rare, suggesting the presence of multi-year shorefast sea ice hindering iceberg formation 41 .…”

Section: Resultssupporting

confidence: 62%

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Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex

Argentino

Waghorn

Vadakkepuliyambatta

et al. 2021

Sci Rep

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Methane emissions from Arctic continental margins are increasing due to the negative effect of global warming on ice sheet and permafrost stability, but dynamics and timescales of seafloor seepage still remain poorly constrained. Here, we examine sediment cores collected from an active seepage area located between 295 and 353 m water depth in the SW Barents Sea, at Leirdjupet Fault Complex. The geochemical composition of hydrocarbon gas in the sediment indicates a mixture of microbial and thermogenic gas, the latter being sourced from underlying Mesozoic formations. Sediment and carbonate geochemistry reveal a long history of methane emissions that started during Late Weichselian deglaciation after 14.5 cal ka BP. Methane-derived authigenic carbonates precipitated due to local gas hydrate destabilization, in turn triggered by an increasing influx of warm Atlantic water and isostatic rebound linked to the retreat of the Barents Sea Ice Sheet. This study has implications for a better understanding of the dynamic and future evolution of methane seeps in modern analogue systems in Western Antarctica, where the retreat of marine-based ice sheet induced by global warming may cause the release of large amounts of methane from hydrocarbon reservoirs and gas hydrates.

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Section: Resultssupporting

confidence: 62%

“…Pebbles are rare, suggesting the presence of multi-year shorefast sea ice hindering iceberg formation 41 . This unit was deposited during the Bølling interstadial (15 cal ka BP) and is tentatively correlated to Unit A2 of Lucchi et al 36 , Unit 3 of Kaparulina et al 38 and Unit Ib of Pau et al 37 .…”

Section: Resultsmentioning

confidence: 78%

Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex

Argentino

Waghorn

Vadakkepuliyambatta

et al. 2021

Sci Rep

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In the shadow of giants: Calcareous nannoplankton and smaller benthic foraminifera from an Eocene nummulitic accumulation (Transylvanian Basin, Romania)

Bindiu-Haitonic

Bălc

Kövecsi

et al. 2021

Marine Micropaleontology

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Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago

et al. 2020

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Rapid sea-level rise caused by the collapse of large ice sheets is a global threat to human societies 1 . In the last deglacial period, the rate of global sea-level rise peaked at more than 4 cm/yr during Meltwater Pulse 1a, which coincided with the abrupt Bølling warming event ~14,650 yr ago 2-5 . However, the sources of the meltwater have proven elusive 6,7 , and the contribution from Eurasian ice sheets has until now been considered negligible [8][9][10] . Here we show that marine-based sectors of the Eurasian ice sheet complex collapsed at the Bølling transition and lost an ice volume of between 4.5 and 7.9 m sea level equivalents (95% quantiles) over 500 yr. During peak melting 14,650 -14,310 yr ago, Eurasian ice sheets lost between 3.3 and 6.7 m sea level equivalents (95% quantiles), thus contributing significantly to Meltwater Pulse 1a. A mean meltwater flux of 0.2 Sv over 300 yr was injected into the Norwegian Sea and the Arctic Ocean during a time when proxy evidence suggests vigorous Atlantic meridional overturning circulation 11,12 . Our reconstruction of the EIS deglaciation shows that a marine-based ice sheet comparable in size to the West Antarctic ice sheet can collapse in as little as 300-500 years.Understanding the response of marine-based ice sheets to global warming is critical to future sea-level projections 1 . Today large marine-based ice sheets are situated in the Antarctic, with the West Antarctic ice sheet long considered to be particularly vulnerable [13][14][15][16] . The time scale and magnitude of its potential disintegration are highly uncertain, however, and its projected contribution to sea-level rise over the next centuries varies by orders of magnitude 17,18 . To add further empirical constraints, researchers turn to past deglaciation events to study the tempo and mode of ice sheet collapse in a warming world. The West

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Sedimentary environments in the south-western Barents Sea during the last deglaciation and the Holocene: a case study outside the Ingøydjupet trough

Cited by 3 publications

References 53 publications

Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex

Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex

In the shadow of giants: Calcareous nannoplankton and smaller benthic foraminifera from an Eocene nummulitic accumulation (Transylvanian Basin, Romania)

Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago

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