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

Artikel i vetenskaplig tidskrift
Författare Göran Björk
M. Jakobsson
Karen Assmann
Leif G Anderson
J. Nilsson
C. Stranne
L. Mayer
Publicerad i Ocean Science
Volym 14
Nummer/häfte 1
Sidor 1-13
ISSN 1812-0784
Publiceringsår 2018
Publicerad vid Institutionen för marina vetenskaper
Sidor 1-13
Språk en
Länkar https://doi.org/10.5194/os-14-1-201...
Ämneskategorier Oceanografi

Sammanfattning

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°ĝN), where the ridge crest meets the Siberian continental slope, and a northern passage around 84.5°ĝN. The southern channel is characterized by smooth and flat bathymetry around 1600–1700ĝm with a sill depth slightly shallower than 1700ĝm. 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 72ĝkm long and 33ĝkm 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 500–600ĝm above a generally 1600ĝm deep trough bottom. The deepest passage (the sill) is 1470ĝm 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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