• 34 million year old microscopic planktonic foraminifera fossils from Java, Indonesia. Photo by Helen Coxall
  • Coring operation on the aft deck of icebreaker Oden. Photo by Martin Jakobsson
  • Deformed limestone, Taimyr expedition. Photo by Vicky Pease
  • Folding on Crete. Photo by Alasdair Skelton
  • Iceland. Photo by Elisabeth Däcker
  • Iceland.Photo by Elisabeth Däcker
  • Oden's bridge, SWERUS expedition. Photo by Björn Eriksson
  • Oman. Photo by Alexandre Peillod
  • Punta di Maiata, Italy. Photo by Jan Backman
  • Siccar Point in Scotland. Photo by Alasdair Skelton
  • Swedish Icebreaker Oden, Lomrog expedition. Photo by Martin Jakobsson
  • Swedish Icebreaker Oden outside Svalbard. Photo by Martin Jakobsson

A new digital bathymetric model of the World Oceans has been compiled within the General Bathymetric Chart of the Oceans (GEBCO) program. The model is described in the AGU journal Earth and Space Science (http://onlinelibrary.wiley.com/doi/10.1002/2015EA000107/full ) and is available for download from the GEBCO web site: http://www.gebco.net 

Weatherall, P., Marks, K.M., Jakobsson, M., Schmitt, T., Tani, S., Arndt, J.-E., Rovere, M., Chayes, D., Ferrini, V., Wigley, R., 2015. A New Digital Bathymetric Model of the World's Oceans. Earth and Space Science, Doi: 10.1002/2015EA000107

General Bathymetric Chart of the Oceans (GEBCO) has released the GEBCO_2014 grid, a new digital bathymetric model of the world ocean floor merged with land topography from publicly available digital elevation models. GEBCO_2014 has a grid spacing of 30 arc seconds, and updates the 2010 release (GEBCO_08) by incorporating new versions of regional bathymetric compilations from the International Bathymetric Chart of the Arctic Ocean (IBCAO), the International Bathymetric Chart of the Southern Ocean (IBCSO), the Baltic Sea Bathymetry Database (BSBD), and data from the European Marine Observation and Data network (EMODnet) bathymetry portal, among other data sources. Approximately 33% of ocean grid cells (not area) have been updated in GEBCO_2014 from the previous version, including both new interpolated depth values and added soundings. These updates include large amounts of multibeam data collected using modern equipment and navigation techniques, improving portrayed details of the world ocean floor. Of all non-land grid cells in GEBCO_2014, approximately 18% are based on bathymetric control data, i.e., primarily multibeam and single beam soundings, or pre-prepared grids which may contain some interpolated values. The GEBCO_2014 grid has a mean and median depth of 3897 m and 3441 m, respectively. Hypsometric analysis reveals that 50% of the Earth's surface is comprised of seafloor located 3200 m below mean sea level, and that ~900 ship-years of surveying would be needed to obtain complete multibeam coverage of the world's oceans.

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