Bathymetry and deep-water exchange across the central Lomonosov Ridge at 88-89°N

Bjork, G, Jakobsson M, Rudes B, Swift JH, Anderson L, Darby DA, Backman J, Coakley B, Winsor P, Polyak L, Edwards M.  2007.  Bathymetry and deep-water exchange across the central Lomonosov Ridge at 88-89°N. Deep-Sea Research Part I-Oceanographic Research Papers. 54:1197-1208.

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Arctic Ocean, arctic-ocean, bathymetry, circulation, deep water, deposits, entrainment, eurasian basin, flow, lomonosov ridge, overflow, sea-ice, sediments


Seafloor mapping of the central Lomonosov Ridge using a multibeam echo-sounder during the Beringia/Healy-Oden Trans-Arctic Expedition (HOTRAX) 2005 shows that a channel across the ridge has a substantially shallower sill depth than the similar to 2500 m indicated in present bathymetric maps. The multibeam survey along the ridge crest shows a maximum sill depth of about 1870 m. A previously hypothesized exchange of deep water from the Amundsen Basin to the Makarov Basin in this area is not confirmed. On the contrary, evidence of a deep-water flow from the Makarov to the Amundsen Basin was observed, indicating the existence of a new pathway for Canadian Basin Deep Water toward the Atlantic Ocean. Sediment data show extensive current activity along the ridge crest and along the rim of a local Intra Basin within the ridge structure.(c) 2007 Elsevier Ltd. All rights reserved.