Marine geological investigations in the Beaufort Sea in 1981 and preliminary interpretations for regions from the Canning River to the Canadian border

Reimnitz, Erk; Barnes, Peter W.; Rearic, Douglas M.; Minkler, P.W.; Kempema, Edward W.; Reiss, Thomas E.

doi:10.3133/ofr82974

Cited by 11 publications

(8 citation statements)

References 6 publications

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“…The comparatively steep shelves of the Beaufort are erosional, and Holocene sediments are absent out to the 30‐m isobaths (Are, ; Reimnitz et al, ). In contrast, sediments east of the Mackenzie river were assumed to be mostly the result of postglacial sediment or buried morainic material and nonsaline (Batchelor et al, ).…”

Section: Discussionmentioning

confidence: 99%

Submarine Permafrost Map in the Arctic Modeled Using 1‐D Transient Heat Flux (SuPerMAP)

et al. 2019

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Offshore permafrost plays a role in the global climate system, but observations of permafrost thickness, state, and composition are limited to specific regions. The current global permafrost map shows potential offshore permafrost distribution based on bathymetry and global sea level rise. As a first‐order estimate, we employ a heat transfer model to calculate the subsurface temperature field. Our model uses dynamic upper boundary conditions that synthesize Earth System Model air temperature, ice mass distribution and thickness, and global sea level reconstruction and applies globally distributed geothermal heat flux as a lower boundary condition. Sea level reconstruction accounts for differences between marine and terrestrial sedimentation history. Sediment composition and pore water salinity are integrated in the model. Model runs for 450 ka for cross‐shelf transects were used to initialize the model for circumarctic modeling for the past 50 ka. Preindustrial submarine permafrost (i.e., cryotic sediment), modeled at 12.5‐km spatial resolution, lies beneath almost 2.5 ×106km2 of the Arctic shelf. Our simple modeling approach results in estimates of distribution of cryotic sediment that are similar to the current global map and recent seismically delineated permafrost distributions for the Beaufort and Kara seas, suggesting that sea level is a first‐order determinant for submarine permafrost distribution. Ice content and sediment thermal conductivity are also important for determining rates of permafrost thickness change. The model provides a consistent circumarctic approach to map submarine permafrost and to estimate the dynamics of permafrost in the past.

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Section: Discussionmentioning

confidence: 99%

Submarine Permafrost Map in the Arctic Modeled Using 1‐D Transient Heat Flux (SuPerMAP)

et al. 2019

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“…28B) and this reflector characterized by jagged relief of 2-to 3-m amplitude is indicated schematically. This reflector is smooth only across a 2-m-high, 500-m-wide, mound at 2.5 m below the present sea floor, located 4.5 km from the coast In our Beaufort Sea geophysical studies, we have generally taken the shallowest, continuous, subbottom reflector to represent the base of Holocene marine sediments, for reasons discussed by Reimnitz and others (1982). In numerous instances, this interpretation has been confirmed by coring and other field studies.…”

Section: Analysis Of a North Slope Profilementioning

confidence: 52%

Beaufort Sea coastal erosion, sediment flux, shoreline evolution, and the erosional shelf profile

Reimnitz¹,

Graves²,

Barnes³

1988

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“…Because most ice gouging takes place under the seasonal ice-pack in the winter when ocean currents are small (Bames, 1981;Matthews, 1981;Barnes and Reimnitz, 1982), sediment transport by ice gouging plays a signifcant role in winter (Harper and Penland, 1982). Barnes (1982), in a study of an ice-pushed, coastal boulder ridge in Camden Bay, about 200-km east of Harrison Bay, suggested that sand, gravel and boulders were moved onshore by direct contact with the sea-ice.…”

Section: Orientations Terminations and Sediment Transportmentioning

confidence: 99%

“…16 and 17) is more southeasterly through southwesterly than northerly. Because sea-ice is driven by ocean currents and winds, which generally move in a westerly direction, sediment that is resuspended during ice gouging will also be driven along the coast or onshore (Barnes and Reimnitz, 1982).…”

Section: Orientations Terminations and Sediment Transportmentioning

confidence: 99%

“…The influence exerted by sea-ice on high-latitude, subglacial seafloor sediment has been known for some time (Kindle, 1924;Carsola, 1954;Rex, 1955). Early studies centered on qualitative description of ice gouge features (Pelletier and Shearer, 1972;Kovacs and Mellor, 1974; Reimnitz and Lewis, 1977), whereas recent studies have involved attempts to quantify ice gouge characteristics (Toimil, 1978;Wahlgren, 1979;Rearic et al, 1981;Thor and Nelson, 1981;Reimnitz et al, 1982;Barnes et al, 1984;Weeks et al, 1984). The above studies have centered on the total population of ice gouges of all ages existing on the seafloor at any one time.…”

Section: Introductionmentioning

confidence: 99%

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Marine geological investigations in the Beaufort Sea in 1981 and preliminary interpretations for regions from the Canning River to the Canadian border

Cited by 11 publications

References 6 publications

Submarine Permafrost Map in the Arctic Modeled Using 1‐D Transient Heat Flux (SuPerMAP)

Submarine Permafrost Map in the Arctic Modeled Using 1‐D Transient Heat Flux (SuPerMAP)

Beaufort Sea coastal erosion, sediment flux, shoreline evolution, and the erosional shelf profile

Temporal and spatial character of newly formed ice gouges in eastern Harrison Bay, Alaska, 1977-1982

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