Mapping the Arctic Ocean - General Bathymetric Chart of ... · Mapping the Arctic Ocean The...
Transcript of Mapping the Arctic Ocean - General Bathymetric Chart of ... · Mapping the Arctic Ocean The...
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Mapping the Arctic OceanThe International Bathymetric Chart of the Arctic Ocean
IBCAO Version 2.0
1500 1800 1900 2008
Martin JakobssonDept. of Geology and Geochemistry
Stockholm university
IBCAO Editorial Board
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The ship Jeanette, under the command of captain De Long, was crushed 12 June 1881 North-West of Wrangell Island.
Pieces of the Jeanette wreck was found three years later on Greenland.
The wreck parts together with e.g. drift wood, which was discovered to have drifted from Siberia to Svalbard, inspired the Framexpedition1893-1896
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Jakobsson et al., 2003
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På denne samme is må også en ekspedisjon kunne føres den samme vei
Nansen, 1890
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1907
2008Jakobsson et al., 2008, GRL
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IBCAO Version 2.0: Source Data
6% of the IBCAO area is mapped with multibeam
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Data mining (cross track analyzes, contour splicing etc.)
Block median filtering
Gridding (Continuous curvature splines in tension algorithm, GMT algorithm: Smith & Wessel, 1990)
Raw data Processed data
Data processing (sound velocity
correction, outlier removal etc.)
Database
Visualization and inspection
Error correction
(data flagging)
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Difference IBCAO Version 1 and 2
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Morris Jesup Rise
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Oden
Thor
Loke
0 3 km
4000 m
Sohn et al., accepterad, Nature
Gakkel Ridge
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• Submarine data collected prior to 1988 were digitized from analogue PDR records
• SCICEX single data was directly saved to disk through the submarines’ PDR’s automated digital bottom tracker
When the data reached IBCAO, the metadata stated that depths referred to a sound velocity of 1500 m/s
Carters tables were subsequently applied in the IBCAO processing scheme to convert depths to corrected meters assuming that that all submarine soundings referred to 1500 m/s as stated by metadata
Submarine data information
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Soundings from ice island T3 highlighted inconsistencies in the flat Canada Basin
Map showing SCICEX and T3 tracksusing the same depth color scale
T3: 3835 mSCICEX: 3741 m
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Depths where T3, Polarstar, SCICEX and US Navy submarine trackscross in the flat Canada Basin
Depth difference at crossover: 95 m
Depths at track crossing
-3860
-3840
-3820
-3800
-3780
-3760
-3740
-3720
-3700
-3680T3 USGS Polarstar 1993 US Nuclear submarine
1973-82SCICEX USS Pogy 1996
Dept
h (m
)
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Unrevealed metadataSubmarine data 1957-1982: Collected using 800 fathoms/sec (about 1463 m/s)
SCICEX data: Collected using 800 fathoms/sec
The above submarine data was not converted to 1500 m/s before release
Submarine data 1983-1988: Collected using 820 fathoms/sec (about 1500 m/s)
T3 data: Immediately corrected using Mathews Table for the Arctic Ocean
USCGC Polarstar: Collected using a sound velocity of 1464 m/s. At the USGS infobank a sound velocity of 1500 m/s is listed for the downloadable data. This is in error!
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Depths after reverting all correctionsand applying 1500 m/s
Depth difference at crossover: 12 mDepths at crossover (1500 m/s)
-4060
-4040
-4020
-4000
-3980
-3960
-3940
-3920
-3900
-3880T3 USGS Polarstar 1993 US Nuclear submarine 1973-82 SCICEX USS Pogy 1996
Dep
th (m
)
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Version 1Version 2
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Version 1Version 2
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We would like to know the Arctic Ocean seafloor as good as we know the topography of Mars
Thanks for listening!