Glacial–interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing

VanLaningham, Sam; Pisias, Nicklas G; Duncan, Robert A.; Clift, Peter D.

doi:10.1016/j.epsl.2008.09.033

Cited by 57 publications

(60 citation statements)

References 35 publications

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“…Also contributing to the lithogenic fraction are hemipelagic material (Jones et al, 1994(Jones et al, , 2000, ice-rafted debris (IRD;McKelvey et al, 1995;St. John and Krissek, 1999) and fine riverine material transported by ocean currents (van de Flierdt et al, 2003;VanLaningham et al, 2009). Turbidites are unlikely to influence the INOPEX stations since they are separated from the margins by deep trenches.…”

Section: Discussionmentioning

confidence: 99%

“…5). Stations 8 and 9 are located on the Meiji drift, a sediment tongue consisting of claysized fluvial-derived debris from the Bering Sea originating from continental material in Alaska and Siberia (Scholl et al, 1977;van de Flierdt et al, 2003;VanLaningham et al, 2009). This continental material probably has a similar geochemical signature to eolian dust and could therefore lead to the overestimation of the dust component.…”

Section: Local Uncertainties In the Lithogenic Component Deconvolutionmentioning

confidence: 99%

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Eolian dust input to the Subarctic North Pacific

Serno

Winckler

Anderson

et al. 2014

Earth and Planetary Science Letters

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Eolian dust is a significant source of iron and other nutrients that are essential for the health of marine ecosystems and potentially a controlling factor of the high nutrient-low chlorophyll status of the Subarctic North Pacific. We map the spatial distribution of dust input using three different geochemical tracers of eolian dust, 4 He, 232 Th and rare earth elements, in combination with grain size distribution data, from a set of core-top sediments covering the entire Subarctic North Pacific. Using the suite of geochemical proxies to fingerprint different lithogenic components, we deconvolve eolian dust input from other lithogenic inputs such as volcanic ash, ice-rafted debris, riverine and hemipelagic input. While the open ocean sites far away from the volcanic arcs are dominantly composed of pure eolian dust, lithogenic components other than eolian dust play a more crucial role along the arcs. In sites dominated by dust, eolian dust input appears to be characterized by a nearly uniform grain size mode at ∼4 μm.Applying the 230 Th-normalization technique, our proxies yield a consistent pattern of uniform dust fluxes of 1-2 g/m 2 /yr across the Subarctic North Pacific. Elevated eolian dust fluxes of 2-4 g/m 2 /yr characterize the westernmost region off Japan and the southern Kurile Islands south of 45 • N and west of 165 • E along the main pathway of the westerly winds. The core-top based dust flux reconstruction is consistent with recent estimates based on dissolved thorium isotope concentrations in seawater from the Subarctic North Pacific. The dust flux pattern compares well with state-of-the-art dust model predictions in the western and central Subarctic North Pacific, but we find that dust fluxes are higher than modeled fluxes by 0.5-1 g/m 2 /yr in the northwest, northeast and eastern Subarctic North Pacific. Our results provide an important benchmark for biogeochemical models and a robust approach for downcore studies testing dust-induced iron fertilization of past changes in biological productivity in the Subarctic North Pacific.

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Section: Discussionmentioning

confidence: 99%

Section: Local Uncertainties In the Lithogenic Component Deconvolutionmentioning

confidence: 99%

Eolian dust input to the Subarctic North Pacific

Serno

Winckler

Anderson

et al. 2014

Earth and Planetary Science Letters

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“…1). Today the Yukon River provides ∼ 63 % of the total sediment load to the Bering Sea and it is suggested that glacial sediments from the Meiji Drift, NW Pacific, contain a larger fraction of terrigenous material delivered from Yukon-Bering Sea sources ( VanLaningham et al, 2009). Surface sediments from the eastern Bering Sea shelf consist of Yukon River-derived detrital material Nagashima et al, 2012).…”

Section: Transport Mechanism and Source Areamentioning

confidence: 99%

“…For the Bering Sea some provenance studies involving sedimentological and geochemical characteristics of surface sediments are available, but were mainly conducted on the eastern Bering Sea shelf (Gardner et al, 1980;Lisitzin, 2002;Asahara et al, 2012;Nagashima et al, 2012). These studies and results from the Meiji Drift in the NW Pacific indicate that a large fraction of the supplied terrigenous material was delivered from Yukon-Bering Sea sources (VanLaningham et al, 2009). However, downcore records reflecting the compositional variability of terrigenous matter in the Bering Sea are missing.…”

Section: Introductionmentioning

confidence: 99%

“…Although sea ice is considered an important transport agent for terrigenous material, geochemical or sedimentological studies assessing past terrigenous matter supply in the N Pacific are rare. Existing studies focused on the Okhotsk Sea Nürnberg and Tiedemann, 2004;Nürnberg et al, 2011), the NW Pacific (Shigemitsu et al, 2007;VanLaningham et al, 2009), and the Southern Ocean (Latimer and Filippelli, 2001). For the Okhotsk Sea, Nürnberg and Tiedemann (2004) suggested that nearly synchronous glacial/interglacial changes in biological and terrigenous fluxes were modulated by sea-ice processes driven by variations in the strength of the Siberian High.…”

Section: Introductionmentioning

confidence: 99%

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Millennial-scale variability of marine productivity and terrigenous matter supply in the western Bering Sea over the past 180 kyr

et al. 2013

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We used piston cores recovered in the western Bering Sea to reconstruct millennial-scale changes in marine productivity and terrigenous matter supply over the past ~180 kyr. Based on a geochemical multi-proxy approach, our results indicate closely interacting processes controlling marine productivity and terrigenous matter supply comparable to the situation in the Okhotsk Sea. Overall, terrigenous inputs were high, whereas export production was low. Minor increases in marine productivity occurred during intervals of Marine Isotope Stage 5 and interstadials, but pronounced maxima were recorded during interglacials and Termination I. The terrigenous material is suggested to be derived from continental sources on the eastern Bering Sea shelf and to be subsequently transported via sea ice, which is likely to drive changes in surface productivity, terrigenous inputs, and upper-ocean stratification. From our results we propose glacial, deglacial, and interglacial scenarios for environmental change in the Bering Sea. These changes seem to be primarily controlled by insolation and sea-level forcing which affect the strength of atmospheric pressure systems and sea-ice growth. The opening history of the Bering Strait is considered to have had an additional impact. High-resolution core logging data (color b*, XRF scans) strongly correspond to the Dansgaard–Oeschger climate variability registered in the NGRIP ice core and support an atmospheric coupling mechanism of Northern Hemisphere climates

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Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins

Malkowski

Johnstone

Sharman

et al. 2022

The Depositional Record

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Continental shelves serve as critical transfer zones in sediment routing systems, linking the terrestrial erosional and deep-water depositional domains. The degree to which clastic sediment is mixed and homogenised during transfer across broad shelves has important implications for understanding deep sea detrital records.Wide continental shelves are thought to act as capacitors characterised by transient sediment storage during sea-level rise and sediment remobilisation during sea-level fall. This study attempts to test the hypothesis that sea-level lowstand yields more efficient and direct sediment transfer from fluvial sources to deep sea sinks compared to highstand when sediment is sequestered and mixed on the shelf. This hypothesis is tested by evaluating U-Pb and Lu-Hf detrital zircon provenance trends along the vast Bering Sea shelf and deep-marine Beringian continental margin. Presented here are 5884 U-Pb ages and 402 Lu-Hf analyses from 30 samples to characterise the provenance of modern to Pleistocene sediment across the Bering Sea region. Both forward and inverse numerical mixture modelling was used to estimate the abundance of distinct fluvial sources in shelfal and deep-water deposits. These results demonstrate that sediment in the Bering Sea is derived from a mixture of regional fluvial sources, but that the Yukon River is the primary detrital source for sediment throughout the region.Although Yukon River signatures are abundant in all basin samples, the relative proportions of Yukon River versus other sources vary spatially across the shelf. A comparison of Holocene and surficial sediment with Pleistocene deposits shows that sediment across the shelf and in the deep sea remains well-mixed between climate states. Thus, detrital provenance signatures in deep-marine deposits outward of broad transfer zones are likely to represent mixtures of fluvial sources regardless of sea level.

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Glacial–interglacial sediment transport to the Meiji Drift, northwest Pacific Ocean: Evidence for timing of Beringian outwashing

Cited by 57 publications

References 35 publications

Eolian dust input to the Subarctic North Pacific

Eolian dust input to the Subarctic North Pacific

Millennial-scale variability of marine productivity and terrigenous matter supply in the western Bering Sea over the past 180 kyr

Continental shelves as detrital mixers: U–Pb and Lu–Hf detrital zircon provenance of the Pleistocene–Holocene Bering Sea and its margins

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