scholarly journals Reports on Current Work Temperatures in the Devon Island Ice Cap, Arctic Canada

1976 ◽  
Vol 16 (74) ◽  
pp. 277-277
Author(s):  
W.S.B. Paterson
Keyword(s):  
Steady State ◽  
Canadian Arctic ◽  
Canadian Arctic Archipelago ◽  
Climatic Warming ◽  
Devon Island ◽  
The Past ◽  
Ice Cap ◽  
Last Glaciation ◽  
Temperature Ranges ◽  
The Difference

AbstractTemperatures have been measured in a 299 m bore hole that reaches the base of the ice near the divide of the main ice cap on Devon Island in the Canadian Arctic Archipelago. Temperature ranges from — 23.0°C at a depth of 20 m to — 18.4°C at the bottom. The difference between surface and bottom temperatures is about 1.5 deg less than expected for a steady state. Recent climatic warming seems the most likely explanation of the discrepancy. The temperature gradient in the lowest 50 m is approximately linear and corresponds to a geothermal heal flux of 1.5 h.f.u. This value may be invalid, however, because temperatures at and below this depth have probably been perturbed by changes of surface temperature during the past several thousand years, particularly by the warming at the end of the last glaciation. A detailed analysis of the results is in progress.

scholarly journals Reports on Current Work Temperatures in the Devon Island Ice Cap, Arctic Canada

1976 ◽  
Vol 16 (74) ◽  
pp. 277
Author(s):  
W.S.B. Paterson
Keyword(s):  
Steady State ◽  
Canadian Arctic ◽  
Canadian Arctic Archipelago ◽  
Climatic Warming ◽  
Devon Island ◽  
The Past ◽  
Ice Cap ◽  
Last Glaciation ◽  
Temperature Ranges ◽  
The Difference

Abstract Temperatures have been measured in a 299 m bore hole that reaches the base of the ice near the divide of the main ice cap on Devon Island in the Canadian Arctic Archipelago. Temperature ranges from — 23.0°C at a depth of 20 m to — 18.4°C at the bottom. The difference between surface and bottom temperatures is about 1.5 deg less than expected for a steady state. Recent climatic warming seems the most likely explanation of the discrepancy. The temperature gradient in the lowest 50 m is approximately linear and corresponds to a geothermal heal flux of 1.5 h.f.u. This value may be invalid, however, because temperatures at and below this depth have probably been perturbed by changes of surface temperature during the past several thousand years, particularly by the warming at the end of the last glaciation. A detailed analysis of the results is in progress.

Comparison of 105 Years of Oxygen Isotope and Insoluble Impurity Profiles from the Devon Island and Camp Century Ice Cores

1979 ◽  
Vol 11 (3) ◽  
pp. 299-305 ◽  
Author(s):  
David A. Fisher
Keyword(s):  
Oxygen Isotope ◽  
Flow Line ◽  
Ice Cores ◽  
Devon Island ◽  
Ice Cap ◽  
Particulate Concentration ◽  
The Difference ◽  
Impurity Profiles ◽  
Level Lowering ◽  
Present Site

Oxygen-isotope profiles for the Devon Island ice cap and Camp Century Greenland are affected by a number of variables, some of which must have been the same for both sites. The two δ(18O) records spanning about 120,000 years are brought into relative alignment by comparison of major δ features, and subsequent verification that the insoluble particulate concentration records were also in phase for this alignment. The difference between the δ profiles is shown to be mainly a function of the altitude of the accumulation area for Camp Century. This altitude seems to have been higher than present for the last 100,000 years, suggesting the present flow line through the site has never been shorter. The maximum altitude for the Camp Century accumulation area is 1500 m above the present site and is almost synchronous with the maximum in particulate concentration that occurs at 16,000 yr B.P. The synchronism is likely due to the maximum sea-level lowering that exposed vast areas of continental shelf to wind erosion.

scholarly journals Gravity Measurements on the Devon Island Ice cap and an Adjoining Glacier

1965 ◽  
Vol 5 (40) ◽  
pp. 489-496 ◽  
Author(s):  
R. D. Hyndman
Keyword(s):  
Canadian Arctic ◽  
Devon Island ◽  
Ice Cap ◽  
Gravity Measurements ◽  
True Values

Abstract Gravity measurements have been used to determine ice thicknesses across the western part of the Devon Island ice cap in the Canadian Arctic. A detailed profile of the ice-cap edge and a profile across an adjoining glacier are also given. The ice cap has been found to have a largely rock core with ice thicknesses generally less than 500 m. A deep valley has been found in the bedrock beneath the ice cap some 15 km. from the start of a draining glacier. The measured depths on the ice cap should be within 15 per cent and those on the glacier within 20 per cent of the true values.

scholarly journals Holocene paleoenvironmental reconstruction from deep ground temperatures: a comparison with paleoclimate derived from the δ18O record in an ice core from the agassiz Ice Cap, Canadian Arctic Archipelago

1991 ◽  
Vol 37 (126) ◽  
pp. 209-219 ◽  
Author(s):  
Alan E. Taylor
Keyword(s):  
Surface Temperature ◽  
Snow Cover ◽  
Ice Core ◽  
Canadian Arctic ◽  
Ground Surface ◽  
Temperature Profiles ◽  
Canadian Arctic Archipelago ◽  
Ground Surface Temperature ◽  
Ice Cap ◽  
Surface Temperatures

Abstract Changes in ground-surface temperature for the past few hundred years have been derived from deep temperature profiles at three wells in the northeastern Canadian Arctic Archipelago, and compared with the climatic history derived from the oxygen-isotope ratio 18O/16O measured in an ice core from the Agassiz Ice Cap, about 180-260 km to the east. Analysis of the ground-temperature profiles suggests that surface temperatures in the area decreased after the Little Climatic Optimum about 1000 years ago until the Little Ice Age (LIA). About 100 years ago, ground-surface temperatures appear to have increased by 2-5K to reach today’s values, while air temperatures increased by 2-3K, according to the isotope record. Part of the larger ground-surface temperature change may be due to other paleoenvironmental effects, such as an increase in snow cover coincident with the end of the LIA. The δ18O climatic record was successful in predicting the general features of the ground-temperature profiles observed at two of the sites, but not the third. There is contemporary evidence that surface temperatures at the latter site may be substantially modified by other environmental factors such as snow cover.

scholarly journals Form and flow of the Devon Island Ice Cap, Canadian Arctic

2004 ◽  
Vol 109 (F2) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. A. Dowdeswell ◽  
T. J. Benham ◽  
M. R. Gorman ◽  
D. Burgess ◽  
M. J. Sharp
Keyword(s):  
Canadian Arctic ◽  
Devon Island ◽  
Ice Cap

Submerged drainage patterns in Barrow Strait, Canadian Arctic

1976 ◽  
Vol 13 (2) ◽  
pp. 305-311 ◽  
Author(s):  
Brian D. Bornhold ◽  
Nancy M. Finlayson ◽  
David Monahan
Keyword(s):  
Canadian Arctic ◽  
Original Model ◽  
Normal Faults ◽  
Canadian Arctic Archipelago ◽  
Drainage Basins ◽  
Fluvial Erosion ◽  
Devon Island ◽  
Drainage Patterns ◽  
Somerset Island ◽  
East West

Recent detailed bathymetric maps of Barrow Strait enabled a reconsideration of the Tertiary fluvial erosion model used to account for the physiography of the Canadian Arctic Archipelago. Five distinct drainage basins were distinguished within Barrow Strait, including both dendritic and rectangular drainage patterns. The latter were controlled by normal faults along the Precambrian–Paleozoic contact in Peel Sound and Barrow Strait.Several changes in the original model are proposed, including the placement of the main east–west drainage divide through Somerset Island and across Barrow Strait and southern Wellington Channel to Devon Island.

scholarly journals Gravity Measurements on the Devon Island Ice cap and an Adjoining Glacier

1965 ◽  
Vol 5 (40) ◽  
pp. 489-496
Author(s):  
R. D. Hyndman
Keyword(s):  
Canadian Arctic ◽  
Devon Island ◽  
Ice Cap ◽  
Gravity Measurements ◽  
True Values

AbstractGravity measurements have been used to determine ice thicknesses across the western part of the Devon Island ice cap in the Canadian Arctic. A detailed profile of the ice-cap edge and a profile across an adjoining glacier are also given. The ice cap has been found to have a largely rock core with ice thicknesses generally less than 500 m. A deep valley has been found in the bedrock beneath the ice cap some 15 km. from the start of a draining glacier. The measured depths on the ice cap should be within 15 per cent and those on the glacier within 20 per cent of the true values.

Reassessment of Ischnacanthus? scheii Spjeldnaes (Acanthodii, Ischnacanthiformes) from the latest Silurian or earliest Devonian of Ellesmere Island, arctic Canada

2013 ◽  
Vol 50 (9) ◽  
pp. 945-954 ◽  
Author(s):  
Carole J. Burrow
Keyword(s):  
Canadian Arctic ◽  
Biological Species ◽  
Ellesmere Island ◽  
Canadian Arctic Archipelago ◽  
Devon Island ◽  
Thin Sectioning ◽  
Bone Fragments ◽  
Cornwallis Island ◽  
North Greenland ◽  
Fin Spines

Articulated specimens of jawed fishes, and assemblages of disarticulated elements that can be assigned to a single biological species, are extremely rare from pre-Devonian deposits. The acanthodian species Ischnacanthus? scheii Spjeldnaes is based on a monospecific assemblage, comprising fin spines, dentigerous jaw bone fragments and scales, from the ?Siluro-Devonian boundary beds of the Devon Island Formation in central west Ellesmere Island, Canadian Arctic Archipelago, Nunavut. A new examination of the type material, in particular by scanning electron microscopy and thin sectioning of scales, shows that the species is a porosiform poracanthodid that is now assigned to Radioporacanthodes scheii comb. nov. Scales of the same species are also recognized from the upper Pridoli of Cornwallis Island and the ?Pridoli or Lochkovian of north Greenland.

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