A Comparison Between GEBCO Sheet 5.17 and the International Bathymetric Chart of the Arctic Ocean (IBCAO) Version 1.0 |
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| Authors: | Martin Jakobsson Ron Macnab |
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| Institution: | (1) Department of Geology and Geochemistry, Stockholm University, 106 91 Stockholm, Sweden;(2) Geological Survey of Canada, Canada |
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| Abstract: | In 1979, the General Bathymetric Chart of the Oceans (GEBCO) published Sheet 5.17 in the Fifth Edition of its series of global
bathymetric maps. Sheet 5.17 covered the northern polar region above 64° N, and was for long the authoritative portrayal of
Arctic bathymetry. The GEBCO compilation team had access to an extremely sparse sounding database from the central Arctic
Ocean, due to the difficulty of mapping in this permanently ice covered region. In the past decade, there has been a substantial
increase in the database of central Arctic Ocean bathymetry, due to the declassification of sounding data collected by US
and British Navy nuclear submarines, and to the capability of modern icebreakers to measure ocean depths in heavy ice conditions.
From these data sets, evidence has mounted to indicate that many of the smaller (and some larger) bathymetric features of
Sheet 5.17 were poorly or wrongly defined. Within the framework of the project to construct the International Bathymetric
Chart of the Arctic Ocean (IBCAO), all available historic and modern data sets were compiled to create a digital bathymetric
model. In this paper, we compare both generally and in detail the contents of GEBCO Sheet 5.17 and version 1.0 of IBCAO, two
bathymetric portrayals that were created more than 20 years apart. The results should be helpful in the analysis and assessment
of previously published studies that were based on GEBCO Sheet 5.17.
Ron Macnab: Retired. |
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| Keywords: | Arctic Ocean bathymetry physiography ocean mapping seafloor morphology |
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