Comparative analysis of six common foraminiferal species of the genera &amp;lt;i&amp;gt;Cassidulina&amp;lt;/i&amp;gt;, &amp;lt;i&amp;gt;Paracassidulina&amp;lt;/i&amp;gt;, and &amp;lt;i&amp;gt;Islandiella&amp;lt;/i&amp;gt; from the Arctic–North Atlantic domain

Cage, Alix G.; Pieńkowski, Anna J.; Jennings, Anne E.; Knudsen, Karen Luise; Seidenkrantz, Marit‐Solveig

doi:10.5194/jm-40-37-2021

Cited by 29 publications

(25 citation statements)

References 79 publications

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“…Data from the Ryder 2019 expedition are available through the Bolin Centre Database at the Bert Bolin Centre for Climate Research (https://bolin.su.se/data/ ryder-2019-expedition-2, last access: 14 August 2021). Marine bathymetry data are available at https://doi.org/10.17043/ryder-2019-bathymetry (Calder et al, 2020), CTD measurements at https://doi.org/10.17043/ryder-2019-ctd (Stranne et al, 2020), MSCL data from sediment cores at https://doi.org/10.17043/odenryder-2019-sediment-mscl-1 (O'Regan, 2021a), and XRF-scanning data at https://doi.org/10.17043/oden-ryder-2019-sediment-xrf-1 (O'Regan, 2021b).…”

Section: Discussionmentioning

confidence: 99%

The Holocene dynamics of Ryder Glacier and ice tongue in north Greenland

et al. 2021

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Abstract. The northern sector of the Greenland Ice Sheet is considered to be particularly susceptible to ice mass loss arising from increased glacier discharge in the coming decades. However, the past extent and dynamics of outlet glaciers in this region, and hence their vulnerability to climate change, are poorly documented. In the summer of 2019, the Swedish icebreaker Oden entered the previously unchartered waters of Sherard Osborn Fjord, where Ryder Glacier drains approximately 2 % of Greenland's ice sheet into the Lincoln Sea. Here we reconstruct the Holocene dynamics of Ryder Glacier and its ice tongue by combining radiocarbon dating with sedimentary facies analyses along a 45 km transect of marine sediment cores collected between the modern ice tongue margin and the mouth of the fjord. The results illustrate that Ryder Glacier retreated from a grounded position at the fjord mouth during the Early Holocene (> 10.7±0.4 ka cal BP) and receded more than 120 km to the end of Sherard Osborn Fjord by the Middle Holocene (6.3±0.3 ka cal BP), likely becoming completely land-based. A re-advance of Ryder Glacier occurred in the Late Holocene, becoming marine-based around 3.9±0.4 ka cal BP. An ice tongue, similar in extent to its current position was established in the Late Holocene (between 3.6±0.4 and 2.9±0.4 ka cal BP) and extended to its maximum historical position near the fjord mouth around 0.9±0.3 ka cal BP. Laminated, clast-poor sediments were deposited during the entire retreat and regrowth phases, suggesting the persistence of an ice tongue that only collapsed when the glacier retreated behind a prominent topographic high at the landward end of the fjord. Sherard Osborn Fjord narrows inland, is constrained by steep-sided cliffs, contains a number of bathymetric pinning points that also shield the modern ice tongue and grounding zone from warm Atlantic waters, and has a shallowing inland sub-ice topography. These features are conducive to glacier stability and can explain the persistence of Ryder's ice tongue while the glacier remained marine-based. However, the physiography of the fjord did not halt the dramatic retreat of Ryder Glacier under the relatively mild changes in climate forcing during the Holocene. Presently, Ryder Glacier is grounded more than 40 km seaward of its inferred position during the Middle Holocene, highlighting the potential for substantial retreat in response to ongoing climate change.

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Section: Discussionmentioning

confidence: 99%

The Holocene dynamics of Ryder Glacier and ice tongue in north Greenland

et al. 2021

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“…The presence of M. barleeanus indicates a change from abundant fresh organic matter supply to a more degraded/recalcitrant organic matter supply at the sea floor (Caralp, 1989;Korsun and Polyak, 1989). Coupling the increase of E. albiumbilicatum with the presence of I. norcrossi (both subarctic) and the decrease of I. helenae (Arctic) suggests the progressive input of Atlantic water and decrease of sea-ice at the core site (Cage et al, 2021).…”

Section: Foraminiferal Summarymentioning

confidence: 99%

Identification of Atlantic water inflow on the north Svalbard shelf during the Holocene

Peral

Austin

Noormets³

2021

J Quaternary Science

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Nordaustlandet is located in the northeastern part of the Svalbard archipelago, within the northernmost reach of the West Spitsbergen Current. This current transports Atlantic water to the Arctic Ocean along the western and northern Svalbard margins. This region is well-suited for reconstructing the history of changing Atlantic water inflow to the Arctic Ocean. We studied the marine sediment core HH12-04-GC from Rijpfjorden. Benthic foraminiferal assemblages and sedimentological data are combined to reconstruct the palaeoenvironment of the fjord from the end of the last local deglaciation to the late Holocene. The local deglaciation, between 11.3 and 10.6 cal ka BP, was dominated by active glacier calving processes, associated with a strong inflow of Atlantic water. This led to the establishment of glaciomarine conditions. The Holocene was initially characterised by a relatively stable and warm environment associated with a strong contribution of Atlantic water. Glaciomarine influence progressively decreases after 9.7 cal ka BP and the Atlantic water contribution increases. The late Holocene displayed a similar environment to today, with the influence of glaciomarine conditions and limited Atlantic water inflow. These results confirm that Atlantic water inflows made a continuous contribution to northern Nordaustlandet throughout the postglacial period.

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“…The Atlantic Water group includes C. neoteretis and P. bulloides. These species indicate warm and saline AW inflow underneath cold and low salinity surface waters (e.g., Mackensen and Hald, 1988;Seidenkrantz 1995;Rytter et al, 2002;Jennings et al, 2004;300 Jennings et al, 2011;Cage et al, 2021). The chilled Atlantic Water group includes I. norcrossi and M. barleeanum.…”

Section: Environmental Significance Of Foraminiferal Assemblagesmentioning

confidence: 99%

“…The chilled Atlantic Water group includes I. norcrossi and M. barleeanum. These species have been previously linked to cool AW (e.g., Slubowska-Woldengen et al, 2007;Perner et al, 2011;Perner et al, 2015;Cage et al, 2021), and we use them to represent the relative contribution of chilled AW recirculated in the Arctic Ocean to the EGC. The Arctic Water group includes S. horvathi and E. arctica.…”

Section: Environmental Significance Of Foraminiferal Assemblagesmentioning

confidence: 99%

Holocene paleoceanography of the Northeast Greenland shelf

Pados-Dibattista

Pearce

Detlef

et al. 2021

Preprint

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Abstract. The Northeast Greenland shelf is highly sensitive to climate and ocean variability because it is swept by the East Greenland Current, which, through the western Fram Strait, forms the main pathway of export of sea ice and cold water masses from the Arctic Ocean into the North Atlantic Ocean. We carried out benthic foraminiferal assemblage, stable isotope- and sedimentological analyses of a marine sediment core retrieved from the Northeast Greenland shelf (core DA17-NG-ST7-73), which provided a multiproxy reconstruction of Holocene paleoceanographic conditions. The results reveal significant variations in the water masses and thus, in the strength of the East Greenland Current over the last ca. 9.4 ka BP. Between 9.4 and 8.2 ka BP the water column off Northeast Greenland was highly stratified, with cold, sea ice-loaded surface waters and strong influx of warm Atlantic Water in the subsurface. At ~8.4 ka BP a short-lived peak in terrestrial elements may be linked to influx of ice-berg transported sediments and thus, to the so-called 8.2 ka event. Holocene Thermal Maximum like conditions prevailed from 8.2 to 6.2 ka BP, with a strong influence of the Return Atlantic Current and a weakened transport of Polar Water in the upper East Greenland Current. After 6.2 ka BP we recorded a return to a more stratified water column with sea-ice loaded surface waters and still Atlantic-sourced subsurface waters. After 4.2 ka BP increased Polar Water at the surface of the East Greenland Current and reduction of the Return Atlantic Water at subsurface levels led to freshening and reduced stratification of the water column and (near) perennial sea-ice cover. The Neoglaciation started at 3.2 ka BP at our location, characterized by a strengthened East Greenland Current. Cold subsurface water conditions with possible sea-ice cover and minimum surface water productivity persisted here throughout the last ~3 kyr.

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Comparative analysis of six common foraminiferal species of the genera <i>Cassidulina</i>, <i>Paracassidulina</i>, and <i>Islandiella</i> from the Arctic–North Atlantic domain

Cited by 29 publications

References 79 publications

The Holocene dynamics of Ryder Glacier and ice tongue in north Greenland

The Holocene dynamics of Ryder Glacier and ice tongue in north Greenland

Identification of Atlantic water inflow on the north Svalbard shelf during the Holocene

Holocene paleoceanography of the Northeast Greenland shelf

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