Particle transport processes at slope environments — event driven flux across the Barents Sea continental margin

Thomsen, Claudia; Blaume, Frank; Fohrmann, Hermann; Peeken, Ilka; Zeller, Ute

doi:10.1016/s0025-3227(01)00143-8

Cited by 22 publications

(11 citation statements)

References 36 publications

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“…These high values are likely due to the proximity of the ice and phytoplankton bloom influenced northern MIZ regions and the associated high flux of particulate organic matter towards the sea floor. Alternatively, resuspension of accumulated sediments elsewhere in the Barents Sea and transport with bottom currents towards deeper glacial troughs are also common in the western Barents Sea (Sternberg et al, 2001;Thomsen et al, 2001;Sarnthein et al, 2003). However, high MOC accumulation rates are typically recorded in the troughs north of the MIZ, while values in the Bear Island trough south of the MIZ are relatively low (Fig.…”

Section: Regionmentioning

confidence: 99%

Towards an improved organic carbon budget for the western Barents Sea shelf

et al. 2014

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Abstract. There is generally a lack of knowledge on how marine organic carbon accumulation is linked to vertical export and primary productivity patterns in the Arctic Ocean. Despite the fact that annual primary production in the Arctic has increased as a consequence of shrinking sea ice, its effect on flux, preservation, and accumulation of organic carbon is still not well understood. In this study, a multi-proxy geochemical and organic-sedimentological approach is coupled with organic facies modelling, focusing on regional calculations of carbon cycling and carbon burial on the western Barents Shelf between northern Scandinavia and Svalbard. OF-Mod 3-D, an organic facies modelling software tool, is used to reconstruct and quantify the marine and terrestrial organic carbon fractions and to make inferences about marine primary productivity changes across the marginal ice zone (MIZ). By calibrating the model against an extensive set of sediment surface samples, we improve the Holocene organic carbon budget for ice-free and seasonally ice-covered areas in the western Barents Sea. The results show that higher organic carbon accumulation rates in the MIZ are best explained by enhanced surface water productivity compared to ice-free regions, implying that shrinking sea ice may reveal a significant effect on the overall organic carbon storage capacity of the western Barents Sea shelf.

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Section: Regionmentioning

confidence: 99%

Towards an improved organic carbon budget for the western Barents Sea shelf

et al. 2014

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“…According to Rebesco et al (2011) these ridges are grounding-zone wedges (GZWs) derived by deposition of unconsolidated, saturated subglacial till during episodic stillstands of the overall ice-stream retreat during last deglaciation. The inner area of the trough contains a complex sediment drift composed by two depocenters (Main and Minor drifts, Rebesco et al, 2016) whose onset was related to the interplay of Atlantic and Arctic waters (West and East Spitzbergen currents respectively), and brine-enriched shelf water (BSW, Aagaard et al, 1985;Fohrmann et al, 1998;Thomsen et al, 2001) produced on the shelf during winter which formation started at around 13 cal ka BP . The Kveithola TMF merges with the neighboring, larger Storfjorden TMF, together forming the Kveithola-Storfjorden TMF system built by glacigenic deposits during full glacial conditions and glacimarine sediments during interglacials (Vorren and Laberg, 1997;Lucchi et al, 2013).…”

Section: Geomorphological Setting and Climate-related Depositional Prmentioning

confidence: 99%

Paleomagnetism and rock magnetism from sediments along a continental shelf-to-slope transect in the NW Barents Sea: Implications for geomagnetic and depositional changes during the past 15 thousand years

Caricchi

Lucchi

Sagnotti

et al. 2018

Global and Planetary Change

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A B S T R A C TPaleomagnetic and rock magnetic data were measured on glaciomarine silty-clay successions along an E-W sediment-core transect across the continental shelf and slope of the Kveithola paleo-ice stream system (south of Svalbard, north-western Barents Sea), representing a stratigraphic interval spanning the last deglaciation and the Holocene.The records indicate that magnetite is the main magnetic mineral and that magnetic minerals are distinctly less abundant on the shelf than at the continental slope. The paleomagnetic properties allow for the reconstruction of a well-defined characteristic remanent magnetization (ChRM) throughout the sedimentary successions. The stratigraphic trends of rock magnetic and paleomagnetic parameters are used for a shelf-slope core correlation and sediment facies analysis is applied for depositional processes reconstruction. The new paleomagnetic records compare to the PSV and RPI variation predicted for the core sites by a simulation using the global geomagnetic field variation models SHA.DIF.14k and CALS7K.2 and closest PSV and RPI regional stack curves. The elaborated dataset, corroborated by available 14 C ages, provides a fundamental chronological framework to constrain the coupling of shelf-slope sedimentary processes and environmental changes in the NW Barents Sea region during and after deglaciation.

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“…In oceans, it has been proved already by field measurements that the intermediate and deep layers are formed by winter time surface cooling or brine rejection due to ice production at high latitudes (e.g., Foster et al, 1976;Killworth et al, 1977;Meincke, 1978;Thorpe and White, 1988;Leaman et al, 1991;Thomsen et al, 2001).…”

Section: Autumn and Winter Cascadingmentioning

confidence: 99%

“…In the beginning of the cooling process in autumn, the flow follows day/night rhythm and is intermittent, characterized by "slugs" of colder water, moving oneby-one from the shore, and plunging underneath the upper mixed layer, into the thermocline -to meet the level of the corresponding density (see, for example, Fer et al, 2002a). This seasonal horizontal convective exchange is shown to be a very efficient mechanism of mixing in lakes and oceans (Farrow, 2004;Fer et al, 2002b;Imboden and Wüest, 1995;Sturman et al, 1999;Killworth, 1977;Bennett, 1971;Thomsen et al, 2001); however, to the authors' knowledge, it was not yet observed in or applied for the conditions of the Baltic Sea. Being physically similar to the cascading in lakes, the process in sea environment is influenced by vertical and horizontal haline stratification.…”

Section: Introductionmentioning

confidence: 99%

On contribution of horizontal and intra-layer convection to the formation of the Baltic Sea cold intermediate layer

Chubarenko

Demchenko

2010

Ocean Sci.

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Abstract. Seasonal cascades down the coastal slopes and intra-layer convection are considered as the two additional mechanisms contributing to the Baltic Sea cold intermediate layer (CIL) formation along with conventional seasonal vertical mixing. Field measurements are presented, reporting for the first time the possibility of denser water formation and cascading from the Baltic Sea underwater slopes, which take place under fall and winter cooling conditions and deliver waters into intermediate layer of salinity stratified deep-sea area. The presence in spring within the CIL of water with temperature below that of maximum density (Tmd) and that at the local surface in winter time allows tracing its formation: it is argued that the source of the coldest waters of the Baltic CIL is early spring (March-April) cascading, arising due to heating of water before reaching the Tmd. Fast increase of the open water heat content during further spring heating indicates that horizontal exchange rather than direct solar heating is responsible for that. When the surface is covered with water, heated above the Tmd, the conditions within the CIL become favorable for intralayer convection due to the presence of waters of Tmd in intermediate layer, which can explain its well-known features -the observed increase of its salinity and deepening with time.

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Particle transport processes at slope environments — event driven flux across the Barents Sea continental margin

Cited by 22 publications

References 36 publications

Towards an improved organic carbon budget for the western Barents Sea shelf

Towards an improved organic carbon budget for the western Barents Sea shelf

Paleomagnetism and rock magnetism from sediments along a continental shelf-to-slope transect in the NW Barents Sea: Implications for geomagnetic and depositional changes during the past 15 thousand years

On contribution of horizontal and intra-layer convection to the formation of the Baltic Sea cold intermediate layer

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