scholarly journals New observations on the geology of eastern Ellesmere Island, Canadian Arctic, part IV: Cambro-Ordovician stratigraphy of the Rawlings Bay area and nunataks of the Agassiz Ice Cap

1998 ◽  
Author(s):  
T de Freitas
Keyword(s):  
Canadian Arctic ◽  
Ellesmere Island ◽  
Ice Cap ◽  
Bay Area

scholarly journals Natural and anthropogenic levels of tritium in a Canadian Arctic ice core, Agassiz Ice Cap, Ellesmere Island, and comparison with other radionuclides

2000 ◽  
Vol 46 (152) ◽  
pp. 35-40 ◽  
Author(s):  
Thomas G. Kotzer ◽  
Akira Kudo ◽  
James Zheng ◽  
Wayne Workman
Keyword(s):  
Ice Core ◽  
Canadian Arctic ◽  
Fission Products ◽  
Ellesmere Island ◽  
Anthropogenic Radionuclides ◽  
Ice Caps ◽  
Nuclear Bomb ◽  
Ice Cap ◽  
Nuclear Weapons Testing ◽  
Arctic Ice

AbstractNumerous studies of the ice caps in Greenland and Antarctica have observed accumulations of transuranic radionuclides and fission products from nuclear weapons testing, particularly during the period 1945–75. Recently, the concentrations of radionuclides in the annually deposited surface layers of Agassiz Ice Cap, Ellesmere Island, Canadian Arctic, from 1945 to the present have been measured and have demonstrated a continuous record of deposition of 137Cs and 239,240Pu in ice and snow. In this study, 3He-ingrowth mass spectrometry has been used to measure the low levels of tritium (3H) in some of these samples. Pre-nuclear-bomb tritium levels in ice-core samples were approximately 12 TU in high-latitude meteoric waters and 3–9 TU in mid-latitude meteoric waters. Comparisons of 3H levels and 3H/137Cs + 239,240Pu ratios, which were quite low during the earliest fission-bomb detonations (1946–51) and substantially higher during thermonuclear hydrogen-fusion bomb testing (1952–64), provide a clear indication of the type of nuclear device detonated. This finding accords with the results from other ice-core studies of the distribution of anthropogenic radionuclides from bomb fallout.

Global transport rates and future prediction of hazardous materials: Pu and Cs – from Nagasaki to Canadian Arctic

2000 ◽  
Vol 42 (7-8) ◽  
pp. 163-169 ◽  
Author(s):  
A. Kudo ◽  
J. Zheng ◽  
R. Yamada ◽  
G. Tao ◽  
T. Sasaki ◽  
...  
Keyword(s):  
Northern Hemisphere ◽  
Atomic Bomb ◽  
Canadian Arctic ◽  
Ice Cores ◽  
Hazardous Materials ◽  
Ellesmere Island ◽  
The Arctic ◽  
Ice Cap ◽  
Global Transport ◽  
Analytical Technology

A historical man-made global pollution of hazardous materials occurred at Nagasaki, Japan on August 9, 1945 detonation of a plutonium (10–15 kg) atomic bomb. Recent advancements in analytical technology made it possible for artificial radionuclides released from the nuclear explosion to be detected in the Arctic ice core layer of 1945. The fission product, 137Cs (23.4 g or 7.44×1013 Bq), and unexpended fission material, 239+240Pu (8.8–13.8 kg or 2.22–3.49×1013 Bq), originating from the Nagasaki A-bomb were measured by collecting 10 ice cores on the Agassiz ice cap, Ellesmere Island, Canada. The deposition rates were 20 mBq/cm2 for 137Cs and 0.16 mBq/cm2 for 239+240Pu, originating from Nagasaki. Assuming the radionuclides, excluding the amount deposited as local fallout, are deposited evenly throughout the northern hemisphere, a rate of 67% of the expected amount of 137Cs arrived at the Arctic while 1.1% of 239+240Pu reached the Arctic. The results suggest that different transport mechanisms exist for these two hazardous contaminants in the global transport system. A non-reactive rare gas, such as neon and argon, can spread evenly throughout northern hemisphere, including Ellesmere island at the Canadian Arctic, while a reactive gas, sulfur dioxide (SO2) will not reach the ice cap. The measured global transport rates of 137Cs and 239+240Pu were 67% and 1.1%, respectively. These measured rates were for the historical man-made hazardous materials and probably obtained for the longest distance of global transport over 10,000 km. Assuming there was a consistency in climate for the next 10,000 years, the chronological anthropogenic deposits, mainly of 239+240Pu, could be detected in the ice layer between 97–98 m from the snow surface at 11,999 AD on the Agassiz ice cap. Even if there were no improvements in the radioactive analytical method used, the ice layers for the 1945–1980 period could still be easily identified with the present analytical technology. Hopefully this study will find a way to use our generation's artefacts for the benefit of our future descendants.

CONSTRAINING LATEST HOLOCENE EXPANSION AND 20TH CENTURY RETREAT OF A SMALL CANADIAN ARCTIC ICE CAP USING ENTOMBED VEGETATION

2016 ◽  
Author(s):  
Simon L. Pendleton ◽  
◽  
Gifford H. Miller ◽  
Robert S. Anderson ◽  
Sarah E. Crump
Keyword(s):  
20Th Century ◽  
Canadian Arctic ◽  
Ice Cap ◽  
Arctic Ice

The first Tertiary (Paleocene) marine mollusks from the Eureka Sound Group, Ellesmere Island, Canada

1991 ◽  
Vol 65 (2) ◽  
pp. 242-248 ◽  
Author(s):  
Louie Marincovich ◽  
William J. Zinsmeister
Keyword(s):  
Atlantic Ocean ◽  
South Dakota ◽  
Arctic Ocean ◽  
Canadian Arctic ◽  
Ellesmere Island ◽  
Marine Mollusks ◽  
Molluscan Fauna ◽  
Northern Atlantic ◽  
Northern Alaska ◽  
Northern Atlantic Ocean

The gastropod Drepanochilus pervetus (Stanton) and the bivalve Cytrodaria rutupiensis (Morris) occur in the Mount Moore Formation at Strathcona Fiord, west-central Ellesmere Island, northern Canada. They are the first marine mollusks identified from the Eureka Sound Group of the Canadian arctic islands. These mollusks correlate with Paleocene faunas of the Cannonball Formation of North Dakota and South Dakota, the Prince Creek Formation of northern Alaska, the Barentsburg Formation of Svalbard, and the Thanet and Oldhaven Formations of southeastern England. These occurrences imply that the earliest Tertiary Arctic Ocean molluscan fauna was compositionally distinct from coeval faunas of the northern Atlantic Ocean.

The historical residue trend of PCBs in the Agassiz Ice Cap, Ellesmere Island, Canada

1995 ◽  
Vol 160-161 ◽  
pp. 117-126 ◽  
Author(s):  
D.J. Gregor ◽  
A.J. Peters ◽  
C. Teixeira ◽  
N. Jones ◽  
C. Spencer
Keyword(s):  
Ellesmere Island ◽  
Ice Cap

scholarly journals Cirriform Rotor Cloud Observed on a Canadian Arctic Ice Cap

1998 ◽  
Vol 126 (6) ◽  
pp. 1741-1745 ◽  
Author(s):  
Hisashi Ozawa ◽  
Kumiko Goto-Azuma ◽  
Koyuru Iwanami ◽  
Roy M. Koerner
Keyword(s):  
Canadian Arctic ◽  
Ice Cap ◽  
Arctic Ice

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 Reconnaissance of a Small Ice Cap Near St Patrick Bay, Robeson Channel, Northern Ellesmere Island, Canada

1973 ◽  
Vol 12 (66) ◽  
pp. 417-421 ◽  
Author(s):  
G. Hattersley-Smith ◽  
H. Serson
Keyword(s):  
Ellesmere Island ◽  
Direct Result ◽  
Ice Caps ◽  
Ice Cap

A reconnaissance was made of one of two small ice caps near the Robeson Channel coast of northern Ellesmere Island. It is shown that, after a period of net wastage, this ice cap is now thickening slightly and extending its margins. The present regime of the ice cap is a direct result of generally cooler summers in the last decade.

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