Displacement of Yukon-derived sediment from Bering Sea to Chukchi Sea during Holocene time

Nelson, H. Roice; Creager, Joe S.

doi:10.1130/0091-7613(1977)5<141:doysfb>2.0.co;2

Cited by 52 publications

(46 citation statements)

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“…Bering Sea geostrophic currents lose strength after passage through the strait (Nelson and Creager, 1977). The shoal, < 10 m below the ocean surface, also acts as a sheltering embayment that traps fast ice and damps northerly and westerly storm waves.…”

Section: Study Area: the North Seward Peninsula Coastmentioning

confidence: 99%

“…The shoal, < 10 m below the ocean surface, also acts as a sheltering embayment that traps fast ice and damps northerly and westerly storm waves. The sandy Wales beach ridge plain serves as an intermediate depositional sink for Norton Sound shelf sand derived from the Yukon River, much of which is carried farther into the southern Chukchi Sea, to be resuspended and transferred onshore into the Shishmaref barrier island chain (Nelson and Creager, 1977). The major input of sand into the Wales spit apparently followed the re-orientation of the Yukon Delta ca.…”

Section: Study Area: the North Seward Peninsula Coastmentioning

confidence: 99%

“…Hence, isostatic compensation is not occurring, in accord with the model expectations of Clark and Lingle (1979, p. 295). The continental shelf offshore from Seward Peninsula is shallow ( < 30 m deep) and covered by several meters of sand and silty sand (Creager and McManus, 1966), susceptible to reworking into barrier islands and spits by prevailing southerly currents entering the Chukchi Sea through Bering Strait (Nelson and Creager, 1977;Naidu and Gardner, 1988). In sum, northwest Alaska has been stable throughout the Holocene and provides a reliable geologic setting for establishing the long-term eustatic trend of sea level.…”

Section: Introductionmentioning

confidence: 99%

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Minimal late Holocene sea level rise in the Chukchi Sea: arctic insensitivity to global change?

Mason

Jordan

2001

Global and Planetary Change

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Long-term estimates of sea level rise are essential for planning responses to anthropogenic global change. The tectonically stable, unglaciated eastern Chukchi Sea coast has numerous depositional environments for extracting long-term records in the absence of tide gauge data. Radiocarbon ages (n = 27) on paleo-marsh beds along several Seward Peninsula lagoons allows the reconstruction of sea level over the last 6000 years in northwest Alaska and indicate a modest sea level rise, $ 1.5 m, or 0.27 mm year . Neoglacial (1600 -200 cal BC) storm deposits from Kotzebue Sound to Barrow are 1 -1.5 m below modern storm surge elevations, supporting the inference of a lower eustatic sea level. Our data-constrained sea level curve establishes that the Chukchi Sea responds at a considerably slower rate than other regions of the world, supporting recent models of isostatic response for the arctic. D

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Section: Study Area: the North Seward Peninsula Coastmentioning

confidence: 99%

Section: Study Area: the North Seward Peninsula Coastmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Minimal late Holocene sea level rise in the Chukchi Sea: arctic insensitivity to global change?

Mason

Jordan

2001

Global and Planetary Change

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“…The standard error of the mean of the replicate sediment samples for alkenone concentration was 5%. The supply of terrestrial organic materials derived from the Yukon River on this study area of the shelf would be limited, because substantial terrestrial organic materials from the Yukon River deposits on only close to the river mouth and in Norton Sound [McManus et al, 1974;Nelson and Creager, 1977]. From the C/N ratio, we estimated that 68-100% of Org.…”

Section: Analysis Of Organic Carbon Total Nitrogen and Alkenonementioning

confidence: 99%

Enhancement of coccolithophorid blooms in the Bering Sea by recent environmental changes

Harada

Sato

Oguri

et al. 2012

Global Biogeochemical Cycles

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[1] Since 1997, ocean color satellite images have revealed large-scale blooms of the coccolithophorid Emiliania huxleyi in the eastern Bering Sea. The blooms are often sustained over several months and have caused ecosystem changes in the Arctic Ocean, as well as in the Bering Sea. We examined continental shelf sediment profiles of alkenone, a biomarker for E. huxleyi, covering the past $70 years. The alkenone records suggest that large E. huxleyi blooms are a novel feature in the Bering Sea as they have occurred only since the late 1970s. Recent changes in alkenone content were closely related to the 1976-77 climatic regime shift in the North Pacific, implying that warming and freshening of Bering Sea waters promoted E. huxleyi blooms. The production rate of diatoms (total valves in sediment samples), the dominant primary producers in the Bering Sea, also increased during the past several decades. However, the ratio of alkenone content to total diatom valves in the sediments increased as E. huxleyi production increased, suggesting that the increase in the E. huxleyi production rate frequently exceeded the increase in the diatom production rate. Overall, our results indicate a possible subarctic region ecosystem shift driven by climate change.

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“…There appears to be a counterclockwise transfer of suspended sediment through Norton Sound but no major region of sediment accumulation equivalent to the Shelikof Strait region was found in or near Norton Sound. Tidal and storm currents within Norton Sound appear to resuspend and redistribute sediment within the sound itself (Nelson and Creager, 1977 …”

Section: Sediment Accumulationmentioning

confidence: 99%

Distribution of Hydrocarbons and Microbial Populations Related to Sedimentation Processes in Lower Cook Inlet and Norton Sound, Alaska

Atlas¹,

Venkatesan²,

Kaplan³

et al. 1983

ARCTIC

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ABSTRACT. In spring and summer 1978 and spring 1979 an integrated study was carried out to examine the interrelationships of physical (sediment deposition), chemical (organic carbon and hydrocarbon concc~m), and bidogid (microbial popllations and activities) factors in the Cook Met and Norton Sound regions with respect to the probable sinks and fates of hydrocarbon cantaminants within these ecosystems. Most of the fine-graincd sediment entering Cook Inlet is transported out of the inlet into Shetikof Strait; however, significant sediment accumulatioll occurs within areas of Kamishalr and Kachemak bays. In Norton Sound, sediment from the Yukon River is transported counterclockwise around the-embayment and approximately 50% is deposited in the nearshore regions of the sound. In both regions, areas of high sediment accumulation are richer in organic carbon and hydrocarbon derived from land than are areas of low sediment accumulation. In general, areas with high sadiment accumulation rates for fine-grained particles are also areas of relatively high microbial activity. Results suggest that these elevated microbial activities reflect biodegradation of detrital carbon associated with these particles. Also, the Cook Inlet and Norton Sound region were found to be free from petroleum hydrocarbon contamination (with the exception of one ana in Cook Inla). No evidence was found of hydrocarbon accumulation resulting from a gas seepage in

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Displacement of Yukon-derived sediment from Bering Sea to Chukchi Sea during Holocene time

Cited by 52 publications

References 0 publications

Minimal late Holocene sea level rise in the Chukchi Sea: arctic insensitivity to global change?

Minimal late Holocene sea level rise in the Chukchi Sea: arctic insensitivity to global change?

Enhancement of coccolithophorid blooms in the Bering Sea by recent environmental changes

Distribution of Hydrocarbons and Microbial Populations Related to Sedimentation Processes in Lower Cook Inlet and Norton Sound, Alaska

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