Records and Processes of Near-Bottom Sediment Transport along the Norwegian-Greenland Sea Margins during Holocene and Late Weichselian (Termination I) Times

Rumohr, Jan; Blaume, Frank; Erlenkeuser, Helmut; Fohrmann, Hermann; Hollender, F. J.; Mienert, Jürgen; Schäfer-Neth, Christian

doi:10.1007/978-3-642-56876-3_10

Cited by 24 publications

(31 citation statements)

References 49 publications

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“…Particle-rich bottom water detached from the seafloor formed an INL at 400 m water depth, the depth where the water mass boundary of NCW and AW occurred. Similar processes have also been reported for the outer Traenadjupet area (Rumohr et al 2001), suggesting that these processes are a common episodic feature along the Norwegian margin, fuelling the living coral reefs.…”

Section: Geological and Biological Factorssupporting

confidence: 77%

“…An INL has also been encountered in the Porcupine Seabight between 700 and 1400 m, and a strong autumn INL between 700 and 970 m (McCave et al 2001). Rumohr et al (2001) mapped the distribution of water masses and particle load by applying CTD plus a transmissiometer on a hydrographic transect at Røst Reef. Particle-rich bottom water detached from the seafloor formed an INL at 400 m water depth, the depth where the water mass boundary of NCW and AW occurred.…”

Section: Geological and Biological Factorsmentioning

confidence: 99%

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Cold-water coral growth in relation to the hydrography of the Celtic and Nordic European continental margin

Dullo¹,

Flögel²,

Rüggeberg³

2008

Mar. Ecol. Prog. Ser.

202

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Along the Atlantic European continental margin, living cold-water coral reefs occur over a wide bathymetric and hydrographical range. Focusing on 2 regions, the Celtic and the Norwegian shelves, we found that cold-water coral reefs are limited to different intermediate water masses. Measurements of the physical and geological properties showed that parameters such as temperature, salinity, dissolved oxygen content, current intensities, and different substrates vary widely without specifically impacting the distribution of living cold-water coral reefs. The habitat of living reefs within the NE Atlantic comprises a temperature-salinity field, with its lower boundary equivalent to the Intermediate Salinity Maximum (ISM). The ISM on the Celtic margin is represented by Mediterranean Outflow Water (MOW), but is replaced by Atlantic Water (AW) on the Norwegian margin. The upper limit corresponds to water mass boundaries of Eastern North Atlantic Water / MOW on the Celtic margin and Norwegian Coastal Water / AW on the Norwegian margin. Our study shows that cold-water corals in the North Atlantic tolerate a wide range of environmental conditions. However, our data indicate that living cold-water coral reefs occur within the density envelope of sigma-theta (σ Θ ) = 27.35 to 27.65 kg m -3 , thus highlighting the importance of physical boundary conditions for cold-water coral growth and distribution.

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Section: Geological and Biological Factorssupporting

confidence: 77%

Section: Geological and Biological Factorsmentioning

confidence: 99%

Cold-water coral growth in relation to the hydrography of the Celtic and Nordic European continental margin

Dullo¹,

Flögel²,

Rüggeberg³

2008

Mar. Ecol. Prog. Ser.

202

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“…On the floor of the Barents shelf, near to the polar front, abundant dense winter water is formed by brine-water rejection in the course of seasonal sea-ice production (Backhaus et al 1997;Rumohr et al 2001). This dense water cascades downslope into the Arctic and Nordic Seas, where it contributes to the formation of bottom water, thus intensifying the Atlantic THC.…”

mentioning

confidence: 99%

Centennial‐to‐millennial‐scale periodicities of Holocene climate and sediment injections off the western Barents shelf, 75°N

Sarnthein

Kreveld

Erlenkeuser

et al. 2003

Boreas

123

173

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At the western continental margin of the Barents Sea, 75°N, hemipelagic sediments provide a record of Holocene climate change with a time resolution of 10-70 years. Planktic foraminifera counts reveal a very early Holocene thermal optimum 10.7-7.7 kyr BP, with summer sea surface temperatures (SST) of 8°C and a much enhanced West Spitsbergen Current. There was a short cooling between 8.8 and 8.2 kyr BP. In the middle and late Holocene summer, SST dropped to 2.5°-5.0°C, indicative of reduced Atlantic heat advection, except for two short warmings near 2.2 and 1.6 kyr BP. Distinct quasi-periodic spikes of coarse sediment fraction (with large portions of lithic grains, benthic and planktic foraminifera) record cascades of cold, dense winter water down the continental slope as a result of enhanced seasonal sea ice formation and storminess on the Barents shelf over the entire Holocene. The spikes primarily cluster near recurrence intervals of 400-650 and 1000-1350 years, when traced over the entire Holocene, but follow significant 885-/840-and 505-/605-year periodicities in the early Holocene. These non-stationary periodicities mimic the Be variability, which is a tracer of solar forcing. Further significant Holocene periodicities of 230, (145) and 93 years come close to the deVries and Gleissberg solar cycles.

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“…significant bioturbation) it would appear even more unlikely that the sharp maxima in IRD and foraminiferan counts would have remained perfectly aligned. Rumohr et al (2001) found evidence for older, allochthonous specimens of N. pachyderma in deglacial deposits at the peripheral parts of the HA. They were not able to correlate short-term oxygen-isotope signatures in adjacent cores tens of kilometres apart and what they considered anomalous values closely related to increased sand content.…”

Section: Bioturbationmentioning

confidence: 86%

“…These sediments carry the sortable-silt signal. We hypothesise, based on previous work by Fohrmann et al (2001) and Rumohr et al (2001), that these current-deposited muds are continuously being delivered down to the HA in internalwave-generated, low-energy turbidity plumes, which are brought to an abrupt halt at our site. We think that the delivery process adds only random noise to the sortable-silt signal, which averages out at the decadal to multidecadal resolution of our cores.…”

Section: Oceanographic Settingmentioning

confidence: 88%

The role of the northward-directed (sub)surface limb of the Atlantic Meridional Overturning Circulation during the 8.2 ka event

2014

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Abstract. The so-called "8.2 ka event" is widely regarded as a major Holocene climate perturbation. It is most readily identifiable in the oxygen-isotope records from Greenland ice cores as an approximately 160-year-long cold interval between 8250 and 8090 years BP. The prevailing view has been that the cooling over Greenland, and potentially over the northern North Atlantic at least, was triggered by the catastrophic final drainage of the Agassiz-Ojibway proglacial lake as part of the remnant Laurentide Ice Sheet collapsed over Hudson Bay at around 8420 ± 80 years BP. The consequent freshening of surface waters in the northern North Atlantic Ocean and the Nordic Seas resulted in weaker overturning, and hence reduced northward ocean heat transport. We have reconstructed variations in the strength of the eastern branch of the Atlantic Inflow into the Nordic Seas around the time of the lake outbursts. While the initial freshwater forcing may have been even larger than originally thought, as the lake outbursts may have been accompanied by a major iceberg discharge from Hudson Bay, our proxy records from the mid-Norwegian Margin do not evidence a uniquely large slowdown in the eastern branch of the Atlantic Inflow at the time. Therefore, its main role in the 8.2 ka event may have been the (rapid) advection of fresh and cold waters to high northern latitudes, initiating rapid sea-ice expansion and an increase in surface albedo.

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Records and Processes of Near-Bottom Sediment Transport along the Norwegian-Greenland Sea Margins during Holocene and Late Weichselian (Termination I) Times

Cited by 24 publications

References 49 publications

Cold-water coral growth in relation to the hydrography of the Celtic and Nordic European continental margin

Cold-water coral growth in relation to the hydrography of the Celtic and Nordic European continental margin

Centennial‐to‐millennial‐scale periodicities of Holocene climate and sediment injections off the western Barents shelf, 75°N

The role of the northward-directed (sub)surface limb of the Atlantic Meridional Overturning Circulation during the 8.2 ka event

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