The geomorphic record of marine-based ice dome decay: Final collapse of the Barents Sea ice sheet

Montelli, Aleksandr; Solovyeva, M. A.; Ахманов, Г.Г.; Mazzini, Adriano; Piatilova, Anna; Bakay, E. A.; Dowdeswell, Julian A.

doi:10.1016/j.quascirev.2023.107973

Cited by 7 publications

(1 citation statement)

References 22 publications

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“…Glacial deposits seem to be a good lithological barrier for fluids migrating from the deeply buried sedimentary sequence to the sea bottom surface and are often covered with rather thin Upper Pleistocene glacial–marine and Holocene marine sediments. The modern bottom relief of the Barents Sea is formed by glacial, glacial–marine, and marine morphogenetic complexes of underwater hills and troughs and is complicated by local erosional and accumulative structures due to iceberg activity and fluid discharge processes [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Structure of Benthic Microbial Communities in the Northeastern Part of the Barents Sea

Stroeva,

Klyukina,

Vidishcheva

et al. 2024

Microorganisms

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The Barents Sea shelf is one of the most economically promising regions in the Arctic in terms of its resources and geographic location. However, benthic microbial communities of the northeastern Barents Sea are still barely studied. Here, we present a detailed systematic description of the structures of microbial communities located in the sediments and bottom water of the northeastern Barents Sea based on 16S rRNA profiling and a qPCR assessment of the total prokaryotic abundance in 177 samples. Beta- and alpha-diversity analyses revealed a clear difference between the microbial communities of diverse sediment layers and bottom-water fractions. We identified 101 microbial taxa whose representatives had statistically reliable distribution patterns between these ecotopes. Analysis of the correlation between microbial community structure and geological data yielded a number of important results—correlations were found between the abundance of individual microbial taxa and bottom relief, thickness of marine sediments, presence of hydrotrolite interlayers, and the values of pH and Eh. We also demonstrated that a relatively high abundance of prokaryotes in sediments can be caused by the proliferation of Deltaproteobacteria representatives, in particular, sulfate and iron reducers.

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Section: Introductionmentioning

confidence: 99%

Structure of Benthic Microbial Communities in the Northeastern Part of the Barents Sea

Stroeva,

Klyukina,

Vidishcheva

et al. 2024

Microorganisms

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Offshore murtoos indicate warm-based Fennoscandian ice-sheet conditions during the Bølling warming in the northern Gulf of Riga, Baltic Sea

et al. 2023

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Extensive glacitectonism and rapid deglacial fluid expulsion in the northeastern Barents Sea

Montelli,

Solovyeva,

Akhmanov

2024

Commun Earth Environ

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High-latitude regions store large amounts of carbon trapped by ice sheets, permafrost and gas hydrates, yet joint evolution of these climate components is poorly understood. Covered by a cold-based ice-sheet during the last glaciation, the seafloor of the northeastern Barents Sea reveals one of the largest known glacitectonic provinces in the Arctic. Up to 200-m high glacitectonic landforms are cratered and overlie faults associated with ‘bright spots’ indicative of subsurface gas accumulations. However, sediment samples show low pore gas concentrations and no present-day gas seepage. We combine new observations and ice-sheet - hydrate modelling to propose that during the Late Weichselian, glacitectonism was caused by patchy substrate stiffening due to gradual growth of subglacial gas hydrates and permafrost. Ice decay led to rapid destabilisation and full drainage of shallow hydrate reservoirs and permafrost thaw, causing craterisation which was likely accompanied by large fluxes of carbon released into the water column. This study shows that these processes were more widespread across glaciated margins, also highlighting sensitivity and potential for abrupt changes of high-latitude carbon pools in response to complex interactions between the cryosphere, ocean, and solid earth.

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The geomorphic record of marine-based ice dome decay: Final collapse of the Barents Sea ice sheet

Cited by 7 publications

References 22 publications

Structure of Benthic Microbial Communities in the Northeastern Part of the Barents Sea

Structure of Benthic Microbial Communities in the Northeastern Part of the Barents Sea

Offshore murtoos indicate warm-based Fennoscandian ice-sheet conditions during the Bølling warming in the northern Gulf of Riga, Baltic Sea

Extensive glacitectonism and rapid deglacial fluid expulsion in the northeastern Barents Sea

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