Bathymetry of the Arctic Ocean North of 85° N latitude |
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| Authors: | LW Sobczak |
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| Institution: | Gravity and Geodynamics Division, Earth Physics Branch, Department of Energy, Mines and Resources, Ottawa, Ontario K1A OY3 Canada |
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| Abstract: | Comparison of a new compilation of available Arctic bathymetric data north of 85° N latitude with previously published charts shows large discrepancies in the position and morphology of several major Arctic sea-floor features. Near the North Pole the Lomonosov Ridge pinches to a width of about 20 km with very steep slopes. The crest of the Ridge at this location is displaced dextrally by about 80 km. Also, the crest of this ridge curves towards Ellesmere Island and does not continue towards Greenland. The Marvin Spur is actually a series of knolls or sea mounts with relief varying from 500 to over 1300 m. The 600 km wide arch known as the Alpha Cordillera consists of closed, wide (10–40 km) elongated (180–260 km) troughs and ridges with relief of over 1000 m. Circular sea mounts and deeps are also noted along this Cordillera. The Arctic Mid-Oceanic Cordillera is a rather flat 200 km wide feature that tilts gently upward by about 500 m from the Pole Abyssal Plain to the Barents Abyssal Plain. It is characterized by a series of narrow ridges and troughs usually less than 20 km wide with a central deep trough over 5100 m deep and shallow ridges rising to heights of 2600 m. These features generally parallel the Lomonosov Ridge. This cordillera appears to be abruptly truncated along the Greenwich meridian. The Morris Jesup Plateau is a single pronged northeast trending feature with relatively shallow westward slopes and steeply dipping eastward slopes. |
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