The Faroe–Shetland Gateway: Late Quaternary water mass exchange between the Nordic seas and the northeastern Atlantic

Rasmussen, Tine L.; Bäckström, Denise L.; Heinemeier, Jan; Klitgaard‐Kristensen, Dorthe; Knutz, Paul Cornils; Kuijpers, Antoon; Lassen, Susanne; Thomsen, Erik; Troelstra, S.R.; Weering, Tjeerd C.E. van

doi:10.1016/s0025-3227(02)00280-3

Cited by 84 publications

(53 citation statements)

References 48 publications

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“…Inter-core correlation of different off-mound cores (GeoB 6718-2, 6719-1) by Dorschel et al (this volume) point out, that (1) a stratigraphic tie point, indicated by a characteristic double peak in the carbonate record, is probably related to Heinrich event H2 and its European precursor event, both dated to 23.7-25.6 cal kyr BP (Bond and Lotti 1995;Grousset et al 2000;Bowen et al 2002), and (2) that the turbidite sequence below 404 cm seems to be slightly older than 31 cal kyr BP. The sedimentation rate decreases from >30 cm/kyr for the late MIS 3 to 10 cm/ kyr for MIS 2, comparable to other near-shelf sites (e.g., Rasmussen et al 2002b;Auffret et al 2002;De Mol et al 2002 bulloides. This results in a sedimentation rate of 2-3 cm/ kyr assuming the core top reflects the present-day surface sediment.…”

Section: Stratigraphysupporting

confidence: 71%

Environmental changes and growth history of a cold-water carbonate mound (Propeller Mound, Porcupine Seabight)

Rüggeberg

Dullo

Dorschel

et al. 2005

Int J Earth Sci (Geol Rundsch)

156

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On-and off-mound sediment cores from Propeller Mound (Hovland Mound province, Porcupine Seabight) were analysed to understand better the evolution of a carbonate mound. The evaluation of benthic foraminiferal assemblages from the off-mound position helps to determine the changes of the environmental controls on Propeller Mound in glacial and interglacial times. Two different assemblages describe the Holocene and Marine Isotope Stage (MIS) 2 and late MIS 3 ($31 kyr BP). The different assemblages are related to changes in oceanographic conditions, surface productivity and the waxing and waning of the British Irish Ice Sheet (BIIS) during the last glacial stages. The interglacial assemblage is related to a higher supply of organic material and stronger current intensities in water depth of recent coral growth. During the last glaciation the benthic faunas showed high abundances of cassidulinid species, implying cold bottom waters and a reduced availability of organic matter. High sedimentation rates and the domination of Elphidium excavatum point to shelf erosion related to sea-level lowering ($50 m) and the progradation of the BIIS onto the shelf. A different assemblage described for the on-mound core is dominated by Discanomalina coronata, Gavelinopsis translucens, Planulina ariminensis, Cibicides lobatulus and to a lower degree by Hyrrokkin sarcophaga. These species are only found or show significantly higher relative abundances in on-mound samples and their maximum contribution in the lower part of the record indicates a higher coral growth density on Propeller Mound in an earlier period. They are less abundant during the Holocene, however. This dataset portrays the boundary conditions of the habitable range for the cold-water coral Lophelia pertusa, which dominates the deep-water reefal ecosystem on the upper flanks of Propeller Mound. The growth of this ecosystem occurs during interglacial and interstadial periods, whereas a retreat of corals is documented in the absence of glacial sediments on-mound. Glacial conditions with cold intermediate waters, a weak current regime and high sedimentation rates provide an unfavourable environmental setting for Lophelia corals to grow. A Late Pleistocene decrease is observed in the mound growth for Propeller Mound, which might face its complete burial in the future, as it already happened to the buried mounds of the Magellan Mound province further north.

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Section: Stratigraphysupporting

confidence: 71%

Environmental changes and growth history of a cold-water carbonate mound (Propeller Mound, Porcupine Seabight)

Rüggeberg

Dullo

Dorschel

et al. 2005

Int J Earth Sci (Geol Rundsch)

156

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“…North of the Wyville-Thompson Ridge, the Norwegian Sea Overflow Water (NSOW) migrates southward across the Faeroe Shetland Channel and then turns west to enter the Faeroe Bank channel (Kuijpers et al, 2002) to join the southern flank of the Iceland-Faeroe Ridge. The NSOW intermittently crosses the Wyville-Thompson Ridge to join the LSW, then reaching our core location (Holliday et al, 2000;New and SmytheWright, 2001;Kuijpers et al, 1998Kuijpers et al, , 2002Rasmussen et al, 2002b).…”

Section: Hydrographic and Oceanographic Settingmentioning

confidence: 93%

“…Dotted grey lines locate major modern hydrographic fronts: PF = Polar Front, AF = Arctic Front, SAF: Sub-Arctic Front (Dickson et al, 1988). The IF = Iceland Faeroe Front is indicated by the dark blue dotted line (Rasmussen et al, 2002b). The palaeogeography of the adjacent European continent during the Last Glacial Maximum with the hydrographic system/paleovalleys of the Manche River (Lericolais et al, 2003) and the paleo-coastline (bold blue line) at 21 ka BP are also depicted.…”

mentioning

confidence: 99%

An ocean–ice coupled response during the last glacial: a view from a marine isotopic stage 3 record south of the Faeroe Shetland Gateway

et al. 2012

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Abstract. The rapid climatic variability characterising the Marine Isotopic Stage (MIS) 3 (∼ 60-30 cal ka BP) provides key issues to understand the atmosphere-ocean-cryosphere dynamics. Here we investigate the response of sea-surface paleoenvironments to the MIS3 climatic variability through the study of a high resolution oceanic sedimentological archive (core MD99-2281, 60 • 21 N; 09 • 27 W; 1197 m water depth), retrieved during the MD114-IMAGES (International Marine Global Change Study) cruise from the southern part of the Faeroe Bank. This sector was under the proximal influence of European ice sheets (Fennoscandian Ice Sheet to the East, British Irish Ice Sheet to the South) during the last glacial and thus probably responded to the MIS3 pulsed climatic changes.We conducted a multi-proxy analysis of core MD99-2281, including magnetic properties, x-ray fluorescence measurements, characterisation of the coarse (> 150 µm) lithic fraction (grain concentration) and the analysis of selected biogenic proxies (assemblages and stable isotope ratio of calcareous planktonic foraminifera, dinoflagellate cyst -e.g. dinocyst -assemblages). Results presented here are focussed on the dinocyst response, this proxy providing the reconstruction of past sea-surface hydrological conditions, qualitatively as well as quantitatively (e.g. transfer function sensu lato). Our study documents a very coherent and sensitive oceanic response to the MIS3 rapid climatic variability: strong fluctuations, matching those of stadial/interstadial climatic oscillations as depicted by Greenland ice cores, are recorded in the MD99-2281 archive. Proxies of terrigeneous and detritical material suggest increases in continental advection during Greenland Stadials (including Heinrich events), the latter corresponding also to southward migrations of polar waters. At the opposite, milder sea-surface conditions seem to develop during Greenland Interstadials. After 30 ka, reconstructed paleohydrological conditions evidence strong shifts in SST: this increasing variability seems consistent with the hypothesised coalescence of the British and Fennoscandian ice sheets at that time, which could have directly influenced sea-surface environments in the vicinity of core MD99-2281.

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“…The muddy drifts, an important part of the architecture of much of the world's continental slopes and rises, are particularly well mapped here by oil industry seismic surveys which have been used to reveal seabed morphology, including moraines and iceberg ploughmarks as well as contourites . Analyses of some of these surveys are starting to reveal the history of currents flowing through this gateway between the Arctic and Atlantic basins, a key location for understanding past climate changes and linkages with ocean circulation (Rasmussen et al, 2002). Deepocean sediments are also significant repositories of blue carbon (Burrows et al, 2014).…”

Section: Marine Geomorphology Of the Scottish Deep-ocean Seabedmentioning

confidence: 99%

Progress in marine geoconservation in Scotland’s seas: assessment of key interests and their contribution to Marine Protected Area network planning

Gordon

Brooks²,

Chaniotis

et al. 2016

Proceedings of the Geologists' Association

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Geoconservation in the marine environment has been largely overlooked, despite a wealth of accumulated information on marine geology and geomorphology and clear links between many terrestrial and marine features. As part of the wider characterisation of Scotland's seas, this study developed criteria and a methodology that follow the established principles of the terrestrial, Great Britain-wide geoconservation audit, the Geological Conservation Review, to assess geodiversity key areas on the seabed. Using an expert judgement approach, eight geodiversity feature categories were identified to represent the geological and geomorphological processes that have influenced the evolution and present-day morphology of the Scottish seabed: Quaternary of Scotland; Submarine Mass Movement; Marine Geomorphology of the Scottish Deep-Ocean Seabed; Seabed Fluid and Gas Seep; Cenozoic Structures of the Atlantic Margin; Marine Geomorphology of the Scottish Shelf Seabed; Coastal Geomorphology of Scotland; and Biogenic Structures of the Scottish Seabed. Within these categories, 35 key areas were prioritised for their scientific value. Specific interests range from large-scale landforms (e.g. submarine landslides, sea-mounts and trenches) to fine-scale dynamic features (e.g. sand waves). Although these geodiversity interests provided supporting evidence for the identification and selection of a suite of Nature Conservation Marine Protected Areas (MPAs) containing important marine natural features, they are only partially represented in these MPAs and existing protected areas. Nevertheless, a pragmatic 2 approach is emerging to integrate as far as possible the conservation management of marine geodiversity with that of biodiversity and based on evidence of the sensitivity and vulnerability of geological and geomorphological features on the seabed.

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The Faroe–Shetland Gateway: Late Quaternary water mass exchange between the Nordic seas and the northeastern Atlantic

Cited by 84 publications

References 48 publications

Environmental changes and growth history of a cold-water carbonate mound (Propeller Mound, Porcupine Seabight)

Environmental changes and growth history of a cold-water carbonate mound (Propeller Mound, Porcupine Seabight)

An ocean–ice coupled response during the last glacial: a view from a marine isotopic stage 3 record south of the Faeroe Shetland Gateway

Progress in marine geoconservation in Scotland’s seas: assessment of key interests and their contribution to Marine Protected Area network planning

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