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A Data Model and Processing Environment for Ocean-Wide Bathymetric Data Compilations
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
2008 (English)In: The international hydrographic review, ISSN 0020-6946, Vol. 9, no 1, 23-33 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2008. Vol. 9, no 1, 23-33 p.
National Category
Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-14759OAI: oai:DiVA.org:su-14759DiVA: diva2:181279
Available from: 2008-12-10 Created: 2008-12-10 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Towards the compilation of a new Digital Bathymetric Model of the North Atlantic Ocean
Open this publication in new window or tab >>Towards the compilation of a new Digital Bathymetric Model of the North Atlantic Ocean
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Topography on land and bathymetry, its underwater depth equivalent, belong to the most fundamental attributes of the solid earth's surface. Over two thirds of the earth is covered by water, with about 90% of this area lying more than 1000m below the sea surface. In contrast to the land area, most of the deep sea remains largely unexplored and to date the topography of the Moon or Mars is much better known than the bathymetry of large parts of our own planet.Deep sea ocean mapping can directly be carried out with ship-bound echo sounders or indirectly through a remote sensing method known as satellite altimetry. Modern echo sounding technology allows for high resolution mapping with unsurpassed accuracy. Due to the vastness of the oceans, however, even after decades of mapping activity, the oceans are far from completely surveyed, and the echo soundings accumulated over the time with different, meanwhile evolving technologies are of highly varying quality. Satellite altimetry, on the contrary, provides virtually complete coverage of the entire globe, although the achieved resolution and accuracy is limited. For the compilation of consistent, ocean spanning Digital Bathymetric Models (DBMs) from raw depth measurements, an appropriate data basis is therefore a heterogeneous mixture of historical and contemporary echo soundings, complemented by satellite altimetry as needed. The North Atlantic is by far the best mapped of all oceans and as such it provides an ideal area to study scientific problems related to ocean mapping and DBM compilation.

The heterogeneity and size of the global bathymetric data basis require powerful solutions to handle and process both data and metadata effectively. In this work, a spatial relational database in combination with a geographical information system (GIS) form a flexible tool kit for a DBM compilation, and a data model for the storage and retrieval of both data and metadata is developed. In a case study I show the potential of the available sounding data in the North Atlantic to derive a DBM with significant improvements over the models commonly used today.

Many geoscientific applications require that data sets are sampled on a regularly spaced grid, notwithstanding the fact that data acquisition often provides measurements at irregular positions and with incomplete coverage.Several methods exist for interpolating and gridding raw data to obtain gapless grids. In ocean mapping, minimum curvature bicubic splines in tension are a commonly used approach. This work presents a refined technique, multiple resolution splines in tension. The method takes the local data density into consideration during the gridding process, in order to reduce gridding artifacts mainly caused by very inhomogeneous data coverage. It is shown that multiple resolution splines in tension allow for a high maximum grid resolution, without introducing artifacts that appear with regular splines in tension interpolation at the same resolution.

Publisher
21 p.
Identifiers
urn:nbn:se:su:diva-28274 (URN)
Presentation
2009-05-14, William Olsson-salen, Geovetenskapens hus, 10:00 (English)
Opponent
Supervisors
Available from: 2011-08-29 Created: 2009-06-11 Last updated: 2011-08-29Bibliographically approved
2. 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.
Series
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 344
Keyword
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
Identifiers
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)
Opponent
Supervisors
Note

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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