Regional variations in provenance and abundance of ice-rafted clasts in Arctic Ocean sediments: implications for the configuration of late Quaternary oceanic and atmospheric circulation in the Arctic

Phillips, R.L.; Grantz, Arthur

doi:10.1016/s0025-3227(00)00101-8

Cited by 123 publications

(116 citation statements)

References 59 publications

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“…3). Such pulses of detrital, dolomite-rich carbonates are linked to the dispersal, off the LIS margin, of glacial sediments originating from Lower Palaeozoic bedrock areas, in the Canadian Arctic 23,24 . Palaeozoic carbonate rocks outcrop on Victoria Island, in the southern part of the Canadian Arctic Archipelago and in the Mackenzie Valley (based on the Canada Bedrock map, shown in Fig.…”

Section: Sedimentary and Geochemical Featuresmentioning

confidence: 99%

Enhanced sea-ice export from the Arctic during the Younger Dryas

Not

Hillaire‐Marcel

2012

Nat Commun

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Section: Sedimentary and Geochemical Featuresmentioning

confidence: 99%

Enhanced sea-ice export from the Arctic during the Younger Dryas

Not

Hillaire‐Marcel

2012

Nat Commun

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“…In the sixth area, the Chukchi Borderland, the lack of correlations among the cores recovered from 520 to 660 m, prevented a composite stratigraphy from being developed. However, a study utilizing visual core descriptions and high-resolution bulk density measurements on undisturbed core material (recovered from 690 to 1917 m) from the Northwind Ridge showed a good correlation within the area illustrating a progressive thinning in lithostratigraphic units towards the northern part of the ridge (Phillips and Grantz, 2001). In this section we focus on the composite stratigraphies derived from the five regions within which correlations were established in this study.…”

Section: Composite Stratigraphiesmentioning

confidence: 94%

“…Clark et al, 1980;Jakobsson et al, 2001;Backman et al, 2004;Spielhagen et al, 2004;O'Regan et al, 2008;Adler et al, 2009), sometimes down to subdecimeter scale changes in the physical properties that reflect subtle variations in sediment composition and grain size (Phillips and Grantz, 2001;O'Regan et al, 2008). Despite the physiographic variability, the modern sea ice cover acts as a homogenizing agent, re-distributing sediments entrained on the margins throughout the basin.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal Arctic Ocean depositional regimes: a key to the evolution of ice drift and current patterns

Sellén

O’Regan

Jakobsson

2010

Quaternary Science Reviews

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a b s t r a c tSediment physical properties measured in cores from all the major ridges and plateaus in the central Arctic Ocean were studied in order to analyze the spatial and temporal consistency of sediment depositional regimes during the Quaternary. In total, six physiographically distinct areas are outlined. In five of these, cores can be correlated over large distances through characteristic patterns in sediment physical properties. These areas are (1) the southern Mendeleev Ridge, (2) the northern Mendeleev Ridge and Alpha Ridge, (3) the Lomonosov Ridge, (4) the Morris Jesup Rise and (5) the Yermak Plateau. Averaged downhole patterns in magnetic susceptibility, bulk density and lithostratigraphy were compiled to establish a composite stratigraphy for each area. In the sixth physiographic area, the Chukchi Borderland, repeated ice-grounding during recent glacial periods complicates the stratigraphy and prevents the compilation of a composite stratigraphy using the studied material. By utilizing published age models for the studied cores we are able to show that the northern Mendeleev Ridge and Alpha Ridge have the lowest average late Quaternary sedimentation rates, while intermediate sedimentation rates prevail on the southern Mendeleev Ridge and the Morris Jesup Rise. The second highest sedimentation rate is observed on the Lomonosov Ridge, whereas the average sedimentation rate on the Yermak Plateau is more than twice as high. The close correlation of physical properties within each area suggests uniform variations in sediment transport through time, at least throughout the later part of the Quaternary. The unique stratigraphic characteristics within each area is the product of similar past depositional regimes and are key for furthering our understanding of the evolution of ice drift and current patterns in the central Arctic Ocean.

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“…Modern average percentages of terrestrial and marine organic carbon on the Arctic shelves are also shown (after Stein et al, 2008). The green dashed lines delineate isolines of carbonate percentages (indicated as green numbers) in Arctic sediments (data from Phillips and Grantz, 2001). The ∼120 m isobath in the Chukchi Borderland region is drawn as a blue dashed line.…”

Section: Present and Past Oceanographic Settingmentioning

confidence: 99%

“…In contrast, samples with low coarse fraction and lower carbonate could be explained by advection of organic carbon from carbonatepoor areas such as the Siberian margins, consistent with the results of Yamamoto and Polyak (2009), and/or by weakening of carbonate transport to the Northwind Ridge. With regard to surface ocean current dynamics, Phillips and Grantz (2001) suggested that the relatively high detrital carbonate observed today at the Northwind Ridge would have been transported from the carbonate-rich Canadian Arctic via the Beaufort Gyre. Spielhagen (1997) also observed increases in carbonate at the southeastern Lomonosov Ridge during MIS 7 and middle MIS 5, which may have been related to substantial sediment transport via an extended Beaufort Gyre during warm periods (Phillips and Grantz, 2001).…”

Section: Anti-correlation Of Caco 3 and Toc And Their Possible Relatimentioning

confidence: 99%

Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr

Rella

Uchida

2011

Biogeosciences

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Abstract. Knowledge on past variability of sedimentary organic carbon in the Arctic Ocean is important to assess natural carbon cycling and transport processes related to global climate changes. However, the late Pleistocene oceanographic history of the Arctic is still poorly understood. In the present study we show sedimentary records of total organic carbon (TOC), CaCO 3 , benthic foraminiferal δ 18 O and the coarse grain size fraction from a piston core recovered from the northern Northwind Ridge in the far western Arctic Ocean, a region potentially sensitively responding to past variability in surface current regimes and sedimentary processes such as coastal erosion. An age model based on oxygen stratigraphy, radiocarbon dating and lithological constraints suggests that the piston core records paleoenvironmental changes of the last 155 kyr. TOC shows orbital-scale increases and decreases that can be respectively correlated to the waxing and waning of large ice sheets dominating the Eurasian Arctic, suggesting advection of fine suspended matter derived from glacial erosion to the Northwind Ridge by eastward flowing intermediate water and/or surface water and sea ice during cold episodes of the last two glacialinterglacial cycles. At millennial scales, increases in TOC might correlate to a suite of Dansgaard-Oeschger Stadials between 120 and 45 ka before present (BP) indicating a possible response to abrupt northern hemispheric temperature changes. Between 70 and 45 ka BP, closures and openings of the Bering Strait could have additionally influenced TOC variability. CaCO 3 content tends to anti-correlate with TOC on both orbital and millennial time scales, which we interpret in terms of enhanced sediment advection from the carbonaterich Canadian Arctic via an extended Beaufort Gyre during warm periods of the last two glacial-interglacial cycles and increased organic carbon advection from the Siberian Arctic Correspondence to: M. Uchida (uchidama@nies.go.jp) during cold periods when the Beaufort Gyre contracted. We propose that this pattern may be related to orbital-and millennial-scale variations of dominant atmospheric surface pressure systems expressed in mode shifts of the Arctic Oscillation.

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Regional variations in provenance and abundance of ice-rafted clasts in Arctic Ocean sediments: implications for the configuration of late Quaternary oceanic and atmospheric circulation in the Arctic

Cited by 123 publications

References 59 publications

Enhanced sea-ice export from the Arctic during the Younger Dryas

Enhanced sea-ice export from the Arctic during the Younger Dryas

Spatial and temporal Arctic Ocean depositional regimes: a key to the evolution of ice drift and current patterns

Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr

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