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Flow of Canadian basin deep water in the Western Eurasian Basin of the Arctic Ocean
Stockholm University, Faculty of Science, Department of Geological Sciences. (Marin geologi)
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2010 (English)In: Deep Sea Research Part I: Oceanographic Research Papers, ISSN 0967-0637, Vol. 57, no 4, 577-586 p.Article in journal (Refereed) Published
Abstract [en]

The LOMROG 2007 expedition targeted the previously unexplored southern part of the Lomonosov Ridge north of Greenland together with a section from the Morris Jesup Rise to Gakkel Ridge. The oceanographic data show that Canadian Basin Deep Water (CBDW) passes the Lomonosov Ridge in the area of the Intra Basin close to the North Pole and then continues along the ridge towards Greenland and further along its northernmost continental slope. The CBDW is clearly evident as a salinity maximum and oxygen minimum at a depth of about 2000 m. The cross-slope sections at the Amundsen Basin side of the Lomonosov Ridge and further south at the Morris Jesup Rise show a sharp frontal structure higher up in the water column between Makarov Basin water and Amundsen Basin water. The frontal structure continues upward into the Atlantic Water up to a depth of about 300 m. The observed water mass division at levels well above the ridge crest indicates a strong topographic steering of the flow and that different water masses tend to pass the ridge guided by ridge-crossing isobaths at local topographic heights and depressions. A rough scaling analysis shows that the extremely steep and sharply turning bathymetry of the Morris Jesup Rise may force the boundary current to separate and generate deep eddies.

Place, publisher, year, edition, pages
2010. Vol. 57, no 4, 577-586 p.
Keyword [en]
Deep water circulation; Intermediate water circulation; Arctic Ocean; Eurasian Basin
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-47295DOI: 10.1016/j.dsr.2010.01.006ISI: 000276942400009OAI: diva2:373551
authorCount :17Available from: 2010-12-07 Created: 2010-11-30 Last updated: 2011-05-06Bibliographically approved
In thesis
1. Mapping bathymetry: From measurement to applications
Open this publication in new window or tab >>Mapping bathymetry: From measurement to applications
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Surface elevation is likely the most fundamental property of our planet. In contrast to land topography, bathymetry, its underwater equivalent, remains uncertain in many parts of the World ocean. Bathymetry is relevant for a wide range of research topics and for a variety of societal needs. Examples, where knowing the exact water depth or the morphology of the seafloor is vital include marine geology, physical oceanography, the propagation of tsunamis and documenting marine habitats. Decisions made at administrative level based on bathymetric data include safety of maritime navigation, spatial planning along the coast, environmental protection and the exploration of the marine resources.

This thesis covers different aspects of ocean mapping from the collection of echo sounding data to the application of Digital Bathymetric Models (DBMs) in Quaternary marine geology and physical oceanography. Methods related to DBM compilation are developed, namely a flexible handling and storage solution for heterogeneous sounding data and a method for the interpolation of such data onto a regular lattice. The use of bathymetric data is analyzed in detail for the Baltic Sea. With the wide range of applications found, the needs of the users are varying. However, most applications would benefit from better depth data than what is presently available. Based on glaciogenic landforms found in the Arctic Ocean seafloor morphology, a possible scenario for Quaternary Arctic Ocean glaciation is developed. Our findings suggest large ice shelves around parts of the Arctic Ocean during Marine Isotope Stage 6, 130–200 ka. Steered by bathymetry, deep water from the Amerasian Basin of the Arctic Ocean flows over the central Lomonosov Ridge into the Eurasian Basin. This water mass is traced on its continuing way towards Greenland and the Fram Strait. At the Morris Jesup Rise, bathymetry plays an important role in the partial re-circulation of the water into the Amerasian Basin.

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, Stockholm University, 2011. 41 p.
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 344
Ocean and coastal mapping, Digital Bathymetric Model, Geographical Information System, Applications of bathymetric data, Baltic Sea, Arctic Ocean, Seafloor morphology, Ocean circulation
National Category
Other Earth and Related Environmental Sciences
Research subject
Marine Geoscience
urn:nbn:se:su:diva-57291 (URN)978-91-7447-309-4 (ISBN)
Public defence
2011-06-08, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (English)

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Submitted.

Available from: 2011-05-12 Created: 2011-05-05 Last updated: 2013-11-06Bibliographically approved

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Jakobsson, MartinEriksson, BjörnHell, BenjaminLöwemark, Ludvig
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