scholarly journals Discussion of “Glacier velocities and dynamic discharge from the ice masses of Baffin Island and Bylot Island, Nunavut, Canada”

2017 ◽  
Vol 54 (1) ◽  
pp. 110-111
Author(s):  
C. Simon L. Ommanney
Keyword(s):  
Canadian Arctic ◽  
Baffin Island ◽  
Canadian Government ◽  
Numbering System ◽  
Similar Investigation ◽  
Bylot Island ◽  
Dynamic Discharge

A similar investigation into calving glaciers and iceberg production on Baffin and Bylot islands was initiated by the Canadian Government in the 1970s. This is described and reference made to the Glacier Atlas of Canada, which, in identifying all individual glaciers in this region of the Canadian Arctic, obviates the need to develop an independent numbering system when individual glaciers need to be identified.

Glacier velocities and dynamic discharge from the ice masses of Baffin Island and Bylot Island, Nunavut, Canada

2015 ◽  
Vol 52 (11) ◽  
pp. 980-989 ◽  
Author(s):  
Wesley Van Wychen ◽  
Luke Copland ◽  
David O. Burgess ◽  
Laurence Gray ◽  
Nicole Schaffer
Keyword(s):  
Discharge Rate ◽  
Point Estimate ◽  
Baffin Island ◽  
Alos Palsar ◽  
Main Trunk ◽  
Ice Dynamics ◽  
Flow Models ◽  
Ice Caps ◽  
Bylot Island ◽  
Dynamic Discharge

Speckle tracking of ALOS PALSAR fine beam data from 2007–2011 are used to determine the surface motion of major ice masses on Baffin Island and Bylot Island in the southern Canadian Arctic Archipelago. Glacier velocities are low overall, with peaks of ∼100 m a−1 and means of ∼20–60 m a−1 common along the main trunk of many outlet glaciers. Peak velocities on Penny and Bylot Island ice caps tend to occur near the mid-sections of their primary outlet glaciers, while the fastest velocities on all other glaciers usually occur near their termini due to relatively large accumulation areas draining through narrow outlets. Estimates of ice thickness at the fronts of tidewater-terminating glaciers are combined with the velocity measurements to determine a regional dynamic discharge rate of between ∼17 Mt a−1 and ∼108 Mt a−1, with a mid-point estimate of ∼55 Mt a−1, revising downward previous approximations. These velocities can be used as inputs for glacier flow models, and provide a baseline dataset against which future changes in ice dynamics can be detected.

Reply to the discussion by Ommanney on “Glacier velocities and dynamic discharge from the ice masses of Baffin Island and Bylot Island, Nunavut, Canada”

2017 ◽  
Vol 54 (1) ◽  
pp. 112-112
Author(s):  
Wesley Van Wychen ◽  
Luke Copland ◽  
David O. Burgess ◽  
Laurence Gray ◽  
Nicole Schaffer
Keyword(s):  
Baffin Island ◽  
Bylot Island ◽  
Dynamic Discharge

Conodont paleontology and biostratigraphy of Ordovician carbonates and petroliferous carbonates on Southampton, Baffin, and Akpatok islands in the eastern Canadian Arctic

1989 ◽  
Vol 26 (10) ◽  
pp. 1880-1903 ◽  
Author(s):  
Alexander D. McCracken ◽  
Godfrey S. Nowlan
Keyword(s):  
Canadian Arctic ◽  
Bedding Plane ◽  
Baffin Island ◽  
Jordan River ◽  
Oil Shales ◽  
Age Range ◽  
Eastern Canadian Arctic

Carbonate and petroliferous carbonate units ("oil shales") on Southampton, Baffin, and Akpatok islands have yielded a total of 2277 conodonts, the more biostratigraphically useful of which indicate not all units are correlative. The Boas River "shale", the lower of the two petroliferous units on Southampton Island, overlies the Bad Cache Rapids Group and contains a diverse fauna, including elements of Amorphognathus ordovicicus Branson and Mehl. Previous reports have indicated the presence of Culumbodina penna Sweet, a species whose range only barely overlaps that of A. ordovicicus in the middle Maysvillian. Carbonate beds and bedding-plane surfaces of the higher Red Head Rapids Formation at Sixteen Mile Brook yielded A. ordovicicus faunas containing Aphelognathus cf. A. divergens Sweet. These beds are likely Richmondian, since A. divergens is known elsewhere only from Richmondian strata. A metasicula of "Glyptograptus" hudsoni Jackson, several natural conodont assemblages, and fused enigmatic coniform elements were also found at Sixteen Mile Brook.The petroliferous unit in unnamed strata at Amadjuak Lake on Baffin Island contains Belodina area Sweet, which is indicative of a late Edenian to early Maysvillian age. Conodonts from the petroliferous strata at Jordan River on Baffin Island suggest a Trentonian to early Maysvillian age. The conodonts recovered from unnamed strata on Akpatok Island are not very diagnostic but indicate an age range from Shermanian to Gamachian.

MEASUREMENTS OF GRAVITY IN THE CANADIAN ARCTIC AND GREENLAND

1950 ◽  
Vol 28a (5) ◽  
pp. 535-541
Author(s):  
Michael Beer
Keyword(s):  
Canadian Arctic ◽  
Reference Points ◽  
The Other ◽  
Baffin Island ◽  
Resolute Bay ◽  
Future Work ◽  
Cornwallis Island

Four determinations of gravity were made during the summer of 1948, with the pendulum apparatus of the Dominion Observatory, at Goose Bay, Labrador (latitude 53°), Frobisher Bay, Baffin Island (latitude 64°), Resolute Bay, Cornwallis Island (latitude 75°), and Thule, Greenland (latitude 77°), approximately. The anomalies at the two most northerly stations are comparatively small and those at the other two stations, although larger, do not exceed many that have been observed in other parts of Canada. Norgaard's determination at Thule is confirmed by the author.It is anticipated that these determinations, apart from their immediate interest, will serve as useful reference points for future work in the Canadian Arctic.

Shelf-facies microfossils from the Uluksan Group (Proterozoic Bylot Supergroup), Baffin Island, Canada

1991 ◽  
Vol 65 (03) ◽  
pp. 361-382 ◽  
Author(s):  
H. J. Hofmann ◽  
G. D. Jackson
Keyword(s):  
Baffin Island ◽  
Rift Basin ◽  
Bylot Island

Coccoid and filamentous microfossils in the Borden Rift Basin on northwestern Baffin Island and western Bylot Island are reported from 14 localities at six general stratigraphic levels in the Society Cliffs Formation, and one in the Victor Bay Formation. At least seven of 12 fossiliferous Society Cliffs samples, and one of two Victor Bay samples, are from cherty dolostones formed in shallow restricted, peritidal evaporitic environments. The remaining six fossiliferous samples accumulated in somewhat deeper, less restricted waters. The assemblage is preserved in black chert nodules and layers and comprises 30 taxa, including the filamentous formsArchaeotrichion? sp.,Tenuofilum septatum, Eomycetopsis robusta, Siphonophycus inornatum, S. kestron, Rhicnonema antiquum, Brachypleganonsp.,Eomicrocoleussp.,Uluksanella baffinensisn. gen. and sp.,Talakania? sp., the coccoid taxaEosynechococcus medius, E. grandis, Archaeoellipsoides obesus, Sphaerophycus parvum, S. medium, Myxococcoides minor, M. grandis, Melasmatosphaeraspp.,Phanerosphaerops capitaneus, Palaeoanacystissp.,Tetraphycus hebeiensis, Eogloeocapsa bella, Gloeodiniopsis magna, G.sp. 1,G. mikros, Polybessurus bipartitus, Cymatiosphaera? sp., the fusiformEupoikilofusa? sp., and rare specimens of two unidentified and problematic taxa.

NOTES ON SOME ARCTIC COLLEMBOLA

1938 ◽  
Vol 70 (7) ◽  
pp. 151-154 ◽  
Author(s):  
H. G. James
Keyword(s):  
Canadian Arctic ◽  
Ellesmere Island ◽  
The Arctic ◽  
Baffin Island ◽  
Arctic Circle ◽  
Far North ◽  
Southern Shore

The following notes were made from a study of several species of Arctic Coollembola collected by Mr. W. J. Brown, of the Division of Entomology, Ottawa. Mr. Brown accompanied the voyage of the Canadian Arctic Patrol during August and September, 1935. During the trip he was able to collect on the southern shore of Baffin Island, and also well within the Arctic Circle as far north as Ellesmere Island.

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