Clay mineral dispersal patterns in the north Bering and Chukchi Seas

Naidu, A. Sathy; Creager, Joe S.; Mowatt, T.C.

doi:10.1016/0025-3227(82)90016-0

Cited by 59 publications

(38 citation statements)

References 9 publications

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“…Spatial variation in mineral composition of surficial sediments along the western Arctic margin has been investigated in a number of studies using different methodological approaches but showing an overall consistent picture (e.g., Naidu et al, 1982;Naidu and Mowatt, 1983;Wahsner et al, 1999;Kalinenko, 2001;Viscosi-Shirley et al, 2003;Darby et al, 2011;Kobayashi et al, 2016). A recent study of mineral distribution in sediments from the Chukchi Sea and adjacent areas of the Arctic Ocean and the Bering Sea suggests that the quartz / feldspar (Q / F) ratio is higher on the North American than on the Siberian side of the western Arctic ( Fig.…”

Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

et al. 2017

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Abstract. The Beaufort Gyre (BG) and the Bering Strait inflow (BSI) are important elements of the Arctic Ocean circulation system and major controls on the distribution of Arctic sea ice. We report records of the quartz / feldspar and chlorite / illite ratios in three sediment cores from the northern Chukchi Sea, providing insights into the long-term dynamics of the BG circulation and the BSI during the Holocene. The quartz / feldspar ratio, interpreted as a proxy of the BG strength, gradually decreased during the Holocene, suggesting a long-term decline in the BG strength, consistent with an orbitally controlled decrease in summer insolation. We propose that the BG rotation weakened as a result of the increasing stability of sea-ice cover at the margins of the Canada Basin, driven by decreasing insolation. Millennial to multi-centennial variability in the quartz / feldspar ratio (the BG circulation) is consistent with fluctuations in solar irradiance, suggesting that solar activity affected the BG strength on these timescales. The BSI approximation by the chlorite / illite record, despite a considerable geographic variability, consistently shows intensified flow from the Bering Sea to the Arctic during the middle Holocene, which is attributed primarily to the effect of higher atmospheric pressure over the Aleutian Basin. The intensified BSI was associated with decrease in sea-ice concentrations and increase in marine production, as indicated by biomarker concentrations, suggesting a major influence of the BSI on sea-ice and biological conditions in the Chukchi Sea. Multi-century to millennial fluctuations, presumably controlled by solar activity, were also identified in a proxy-based BSI record characterized by the highest age resolution.

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Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

et al. 2017

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“…Unit is in percentage. Naidu and Mowatt, 1983;Naidu et al, 1982Naidu et al, , 1995Lisitzin, 1996). The clay mineral variations do not show distinct glacial-interglacial changes.…”

Section: Resultsmentioning

confidence: 88%

“…Fig. 2 shows the distribution of smectite and illite in surface sediments of the Bering Sea (Naidu et al, 1982(Naidu et al, , 1995Naidu and Mowatt, 1983). Note that illite increases northward and smectite shows the opposite trend (Fig.…”

Section: Distribution and Provenance Of Clay Minerals In The Bering Seamentioning

confidence: 93%

Clay mineral stratigraphy during the last 2.4Ma at IODP Exp. 323 Site U1343 in the Bering Sea

2015

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“…Concluding that illite, chlorite and smectite are the most common clay minerals. Naidu et al (1982) researched soil samples and concluded that in the East Siberian, Chukchi and western Beaufort seas, illite is the most abundant clay mineral.…”

Section: Properties Of Arctic Clay Obtained By Samplingmentioning

confidence: 99%

Failure mechanism of cutting submerged frozen clay in an arctic trenching process

Liefferink

2014

Day 3 Wed, May 07, 2014

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This version of the thesis only covers the literature study. The results analysis and conclusion of the thesis are confidential.Pipelines in arctic waters are at risk of being damaged by gouging ice masses. To protect these pipelines, they can be buried in trenches. When trenching in arctic clayey soil, subsea permafrost can be encountered. The main objective of this research is to study the failure mechanism of frozen clay as encountered in permafrost regions. Knowledge of the cutting mechanism leads to the ability to calculate cutting forces and the specific energy required to excavate material.To find the failure mechanism and answer the research question, a cutting setup was designed and built and cutting experiments were conducted. The setup was designed, based on requirements that result from studied literature on frozen clay and cutting theories. A series of cutting experiments were conducted where a slab of frozen clay was pressed against a transparent wall and the top layer was cut off while filming the process with a high speed camera. The results are measurements of the cutting forces and observations of the failure mechanism.

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Clay mineral dispersal patterns in the north Bering and Chukchi Seas

Cited by 59 publications

References 9 publications

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

Clay mineral stratigraphy during the last 2.4Ma at IODP Exp. 323 Site U1343 in the Bering Sea

Failure mechanism of cutting submerged frozen clay in an arctic trenching process

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