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Volume 14, issue 1 | Copyright

Special issue: Climate–carbon–cryosphere interactions in the...

Ocean Sci., 14, 1-13, 2018
https://doi.org/10.5194/os-14-1-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 02 Jan 2018

Research article | 02 Jan 2018

Bathymetry and oceanic flow structure at two deep passages crossing the Lomonosov Ridge

Göran Björk1, Martin Jakobsson2, Karen Assmann1, Leif G. Andersson1, Johan Nilsson3,4, Christian Stranne2,5, and Larry Mayer5 Göran Björk et al.
  • 1Department of Marine Sciences, University of Gothenburg, Gothenburg 405 30, Sweden
  • 2Department of Geological Sciences, Stockholm University, Stockholm 106 91, Sweden
  • 3Bolin Centre for Climate Research, Stockholm University, Stockholm 106 91, Sweden
  • 4Department of Meteorology, Stockholm University, Stockholm 106 91, Sweden
  • 5Center for Coastal and Ocean Mapping, University of New Hampshire, New Hampshire 03824, USA

Abstract. The Lomonosov Ridge represents a major topographical feature in the Arctic Ocean which has a large effect on the water circulation and the distribution of water properties. This study presents detailed bathymetric survey data along with hydrographic data at two deep passages across the ridge: a southern passage (80–81°N), where the ridge crest meets the Siberian continental slope, and a northern passage around 84.5°N. The southern channel is characterized by smooth and flat bathymetry around 1600–1700m with a sill depth slightly shallower than 1700m. A hydrographic section across the channel reveals an eastward flow with Amundsen Basin properties in the southern part and a westward flow of Makarov Basin properties in the northern part. The northern passage includes an approximately 72km long and 33km wide trough which forms an intra-basin in the Lomonosov Ridge morphology (the Oden Trough). The eastern side of the Oden Trough is enclosed by a narrow and steep ridge rising 500–600m above a generally 1600m deep trough bottom. The deepest passage (the sill) is 1470m deep and located on this ridge. Hydrographic data show irregular temperature and salinity profiles indicating that water exchange occurs as midwater intrusions bringing water properties from each side of the ridge in well-defined but irregular layers. There is also morphological evidence that some rather energetic flows may occur in the vicinity of the sill. A well expressed deepening near the sill may be the result of seabed erosion by bottom currents.

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This study presents detailed bathymetric data along with hydrographic data at two deep passages across the Lomonosov Ridge in the Arctic Ocean. The southern channel is relatively smooth with a sill depth close to 1700 m. Hydrographic data reveals an eastward flow in the southern part and opposite in the northern part. The northern passage is characterized by a narrow and steep ridge with a sill depth of 1470 m. Here, water exchange appears to occur in well-defined but irregular vertical layers.
This study presents detailed bathymetric data along with hydrographic data at two deep passages...
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