Fluctuations of the Svalbard–barents Sea Ice Sheet During the Last 150 000 Years

Mangerud, Jan; Dokken, Trond; Hebbeln, Dierk; Heggen, Beathe; Inǵólfsson, Ólafur; Landvik, Jon Y.; Mejdahl, V.; Svendsen, John Inge; Vorren, Tore O.

doi:10.1016/s0277-3791(97)00069-3

Cited by 223 publications

(242 citation statements)

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“…Although the Kongsfjordhallet sections have been repeatedly covered by glaciers and ice sheets during the last 200 ka [6,26], there is a conspicuous lack of tills in its stratigraphic record. Instead, most glaciations are only inferred from raised marine and littoral deposits (see "Marine and littoral: Movement was from right to left in the photo and the most distal part of the lobe is currently being eroded at the coastal cliff vital chronological keys and glacial indicators").…”

Section: Subglacial: Scarce Direct Traces Of Ice Covermentioning

confidence: 99%

“…While the Late Weichselian glacial extent, glacial dynamics and deglaciation in the Svalbard sector of the ice sheet are reasonably well known [1][2][3], large uncertainties remain for older glaciations [e.g. 2,[4][5][6]. This is partly due to a low preservation potential of older records that yields a bias towards representation of the younger events.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9], each sequence interpreted to represent a glaciation with glacioisostatic down-warping succeeded by a deglaciation with marine deposition in deeper to gradually shallower water during crustal emergence [6,[9][10][11]. As eustatic sea level was lower in the glacial periods [12], only regional glaciations have sufficient impact to explain a glacioisostatic uplift large enough for marine deposits to be found above present-day sea level [6,13]. High-sea-level events can, therefore, be used for correlation between sites along the west coast of Svalbard as the rigid crust is depressed over large areas by ice load [6,13].…”

Section: Introductionmentioning

confidence: 99%

“…As eustatic sea level was lower in the glacial periods [12], only regional glaciations have sufficient impact to explain a glacioisostatic uplift large enough for marine deposits to be found above present-day sea level [6,13]. High-sea-level events can, therefore, be used for correlation between sites along the west coast of Svalbard as the rigid crust is depressed over large areas by ice load [6,13]. Even when subglacial tills are lacking in the stratigraphic record, such high-sea-level events must represent major ice sheet advance and retreat allowing enough time for isostatically adjustments.…”

Section: Introductionmentioning

confidence: 99%

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200 ka of glacial events in NW Svalbard: an emergence cycle facies model and regional correlations

Alexanderson

Henriksen

Ryen

et al. 2018

Arktos

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Late Quaternary sedimentary units at Kongsfjordhallet, NW Svalbard, represent five cycles of glaciations and subsequent deglaciations during high relative sea levels. The high sea level events are interpreted as glacioisostatically induced and imply preceding regional glaciations, which we constrain in time by luminescence and radiocarbon ages to just prior to ~ 195, ~ 130, ~ 85, ~ 60, and ~ 15 ka. Combined with the stratigraphical record from nearby Leinstranda we identify six, possibly seven, major glacial advances during the last 200 ka in the Kongsfjorden region. Two of these occurred during the Saalian and at least four during the Weichselian. The results are based on detailed sedimentological, stratigraphical and chronological investigations of the uppermost 15 m of the 40-m-high Kongsfjordhallet coastal sections. The succession is dominated by sediments of marine and littoral origin, representing partial shallowing-upward sequences due to isostatic rebound. Only one subglacial till was recognised. Interestingly, alluvial and periglacial deposits, not commonly recognised in this type of setting, occur in the sequence. These include weathered coarse alluvium, sandy channel fills as well as cryoturbated sediments and solifluction deposits, which are positive evidence of a non-glacial environment. The sequence of sediments that represents an emergence cycle has been formalised in a facies model.

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Section: Subglacial: Scarce Direct Traces Of Ice Covermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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200 ka of glacial events in NW Svalbard: an emergence cycle facies model and regional correlations

Alexanderson

Henriksen

Ryen

et al. 2018

Arktos

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“…It is not clear how much, for the oxygen isotope data in benthonic foraminifera may have been affected by a substantial cooling of the ocean bottom waters. In the mountains, glaciers in northern Europe did advance during this early glacial interval (Glaciation C of Mangerud et al, 1998).…”

Section: Polar Icementioning

confidence: 99%

Last Interglacial Climates

Kukla¹,

et al. 2002

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The last interglacial, commonly understood as an interval with climate as warm or warmer than today, is represented by marine isotope stage (MIS) 5e, which is a proxy record of low global ice volume and high sea level. It is arbitrarily dated to begin at approximately 130,000 yr B.P. and end at 116,000 yr B.P. with the onset of the early glacial unit MIS 5d. The age of the stage is determined by correlation to uranium-thorium dates of raised coral reefs. The most detailed proxy record of interglacial climate is found in the Vostok ice core where the temperature reached current levels 132,000 yr ago and continued rising for another two millennia. Approximately 127,000 yr ago the Eemian mixed forests were established in Europe. They developed through a characteristic succession of tree species, probably surviving well into the early glacial stage in southern parts of Europe.

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Paleo‐methane emissions recorded in foraminifera near the landward limit of the gas hydrate stability zone offshore western Svalbard

Panieri

Graves

James

2016

Geochem Geophys Geosyst

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We present stable isotope and geochemical data from four sediment cores from west of Prins Karls Forland (ca. 340 m water depth), offshore western Svalbard, recovered from close to sites of active methane seepage, as well as from shallower water depths where methane seepage is not presently observed. Our analyses provide insight into the record of methane seepage in an area where ongoing ocean warming may be fueling the destabilization of shallow methane hydrate. The d13 C values of benthic and planktonic foraminifera at the methane seep sites show distinct intervals with negative values (as low as 227.8&) that do not coincide with the present-day depth of the sulfate methane transition zone (SMTZ). These intervals are interpreted to record long-term fluctuations in methane release at the present-day landward limit of the gas hydrate stability zone (GHSZ). Shifts in the radiocarbon ages obtained from planktonic foraminifera toward older values are related to methane-derived authigenic carbonate overgrowths of the foraminiferal tests, and prevent us from establishing the chronology of seepage events. At shallower water depths, where seepage is not presently observed, no record of past methane seepage is recorded in foraminifera from sediments spanning the last 14 ka cal BP ( 14 C-AMS dating). d 13 C values of foraminiferal carbonate tests appear to be much more sensitive to methane seepage than other sediment parameters. By providing nucleation sites for authigenic carbonate precipitation, foraminifera thus record the position of even a transiently stable SMTZ, which is likely to be a characteristic of temporally variable methane fluxes.

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Fluctuations of the Svalbard–barents Sea Ice Sheet During the Last 150 000 Years

Cited by 223 publications

References 0 publications

200 ka of glacial events in NW Svalbard: an emergence cycle facies model and regional correlations

200 ka of glacial events in NW Svalbard: an emergence cycle facies model and regional correlations

Last Interglacial Climates

Paleo‐methane emissions recorded in foraminifera near the landward limit of the gas hydrate stability zone offshore western Svalbard

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