Terrigenous Sedimentation on the Submarine Shirshov Ridge (Bering Sea) during the Last Deglaciation

Murdmaa, I. O.; Dorokhova, Evgenia; Ovsepyan, E. A.; Dara, O. M.; Nürnberg, Dirk

doi:10.1134/s0024490219020068

Cited by 6 publications

(7 citation statements)

References 30 publications

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“…Their interpretation of silt-rich sediments as drift deposits underneath prevailing sea ice during glacial stages is consistent with our explanation of dominant background sedimentation (Lund et al, 2021). Also, on the Shirshov Ridge in the western Bering Sea, silt-rich sediments, similar to our EM3, are interpreted as hemipelagic sediments under the influence of bottom currents (Murdmaa et al, 2019). According to the strong variation through the deglacial process (e.g., shelf flooding, and intensification of the Bering Slope Current), EM3 in our study does not follow a clear glacial-interglacial variation pattern.…”

Section: Modes Of Terrigenous Sediment Supplysupporting

confidence: 90%

“…Furthermore, the assemblage varies within the limits of the mineralogical composition of sediment loads in modern rivers around the Bering Sea (Naidu and Mowatt, 1983). Such a pattern of low variability and common sediment sources through time has also been inferred from the pelagic Bering Sea for the late Quaternary (Murdmaa et al, 2019) and for the last 2.4 million years from IODP Site U1343, situated in the central part of the Bering Slope (Kim et al, 2015). However, the latter record has no sufficient temporal resolution to be comparable with our record.…”

Section: Terrigenous Sediment Sourcesmentioning

confidence: 77%

“…Modes of sedimentary processes in the marine environments of the Bering Sea and nearby Arctic Ocean can be inferred in their relative intensity from grain-size distributions and their subpopulations that reflect the intensity, transport capability, and consistency of glacial, sea-ice, aquatic, and eolian sediment sources and transport (Darby et al, 2009;Wang et al, 2016;Deschamps et al, 2018;Murdmaa et al, 2019).…”

Section: Modes Of Terrigenous Sediment Supplymentioning

confidence: 99%

“…The common interpretation is that sand-rich sediments, which generally characterize interglacial periods at the Bering Slope, originate in coarse materials that become mobilized during interglacial times of flooded shelves (Lund et al, 2021). In the pelagic Bering Sea, sand-rich sediments point to sea-ice rafting of anchor ice from the shelves (Murdmaa et al, 2019). We favour our interpretation that the enrichment in sand possibly points to strong winnowing effects, causing residual sand enrichment by the vigor contour currents of the Bering Slope Current that branches off towards the Bering Strait at the study site (Figure 1).…”

Section: Modes Of Terrigenous Sediment Supplymentioning

confidence: 99%

“…In polar and subpolar regions, another factor is fine sediment trapped in sea ice and released by melting, an important process in the Arctic Ocean (Nürnberg and Tiedemann, 2004;Darby et al, 2009;Wang et al, 2021). In the pelagic Bering Sea, clay-rich sediments are related to hemipelagic sedimentation under sea ice and weak bottom currents (Murdmaa et al, 2019). From the different interpretations, we conclude that the finest observed grain-size population, represented by EM1, might be best related to the influence of fluvial suspension load in a near-coastal setting.…”

Section: Modes Of Terrigenous Sediment Supplymentioning

confidence: 99%

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Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea

et al. 2021

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A marine sediment record from the central Bering Sea, spanning the last 20 thousand years (ka), was studied to unravel the depositional history with regard to terrigenous sediment supply and biogenic sedimentation. Methodic approaches comprised the inference of accumulation rates of siliciclastic and biogenic components, grain-size analysis, and (clay) mineralogy, as well as paleoclimatic modelling. Changes in the depositional history provides insight into land-ocean linkages of paleoenvironmental changes. During the finale of the Last Glacial Maximum, the depositional environment was characterized by hemipelagic background sedimentation. A marked change in the terrigenous sediment provenance during the late Heinrich 1 Stadial (15.7–14.5 ka), indicated by increases in kaolinite and a high glaciofluvial influx of clay, gives evidence of the deglaciation of the Brooks Range in the hinterland of Alaska. This meltwater pulse also stimulated the postglacial onset of biological productivity. Glacial melt implies regional climate warming during a time of widespread cooling on the northern hemisphere. Our simulation experiment with a coupled climate model suggests atmospheric teleconnections to the North Atlantic, with impacts on the dynamics of the Aleutian Low system that gave rise to warmer winters and an early onset of spring during that time. The late deglacial period between 14.5 and 11.0 ka was characterized by enhanced fluvial runoff and biological productivity in the course of climate amelioration, sea-level rise, seasonal sea-ice retreat, and permafrost thaw in the hinterland. The latter processes temporarily stalled during the Younger Dryas stadial (12.9-11.7 ka) and commenced again during the Preboreal (earliest Holocene), after 11.7 ka. High river runoff might have fertilized the Bering Sea and contributed to enhanced upper ocean stratification. Since 11.0 ka, advanced transgression has shifted the coast line and fluvial influence of the Yukon River away from the study site. The opening of the Bering Strait strengthened contour currents along the continental slope, leaving behind winnowed sand-rich sediments through the early to mid-Holocene, with non-deposition occurring since about 6.0 ka.

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Section: Modes Of Terrigenous Sediment Supplysupporting

confidence: 90%