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The EAGER 2011 cruise with the Swedish Icebreaker Oden

The EAGER 2011 cruise with the Swedish Icebreaker Oden The EAGER 2011 (East Greenland Ridge) cruise with the Swedish icebreaker Oden will acquire multibeam bathymetry, subbottom profiler and seismic reflection and refraction profiles and gravity data. In addition to geophysical mapping, oceanographic sampling will be carried out. These mapping activities are all part of the Continental Shelf Project of the Kingdom of Denmark. The cruise is organized in cooperation with the Swedish Polar Secretariat.

The EAGER 2011 cruise will start in Longyearbyen on Svalbard on August 17 and end in Longyearbyen on Svalbard September 09.

Fram Strait and Greenland Sea region
Map showing the Fram Strait and Greenland Sea region. The working area for the EAGER 2011 cruise is shown by a red circle.

The multibeam bathymetric data acquisition will focus on the mapping of the East Greenland Ridge and the continental slope of the North-East Greenland continental margin south of the ridge.

Multibeam bathymetry will be collected continuously during EAGER 2011 with the SIMRAD EM 122 multibeam echo sounder installed in Oden in order to study bottom processes and seafloor morphology. This multibeam system operates with a frequency of 12 kHz and collects depth information over a swath width approximately five times the operating water depth. In addition, subbottom profiling will be carried out continuously to characterise the upper approximately 50 -200 m seafloor sediment stratigraphy using Oden's hull mounted 2-8 kHz chirp sonar system SBP 120.

The seismic data acquisition will investigate how the East Greenland Ridge is attached to the North-East Greenland shelf. Refraction seismic investigations will use both ocean bottom seismometers (OBS) and sonobuoys. Reflection seismic data will be acquired using a short streamer (approx 300 meters). The total length of the seismic profiles is about 280 nautical miles, with approx 25 nautical miles in Norwegian waters.

The seismic source consists of four G-gun’s each with a chamber size of 520 cubic inch (total volume 2080 cubic inch). The four guns are arranged as two parallel clusters with one gun in each corner. The distance between each gun is approx. 90 cm. The towing depth of the gun array will be from 6 meter to 20 meter below water surface. During refraction seismic measurements the airguns will be fired at a pressure of 3000 PSI every 60 sec., whereas only two airguns (total volume 1040 cubic inch) are used during reflection seismic measurements and fired every 12 sec.

Oceanographic sampling, including CTD and water collection, will be carried out at dedicated hydrographic stations. Sound velocity data will be used to calibrate the multibeam data. Gravity data will be acquired during the entire EAGER 2011 cruise. Furthermore a biochemical and an ornithological research project participate in the cruise.

For further information please contact Christian Marcussen (link til christian.marcussen@eager.polar.se (indtil 9.9.2011) derefter cma@geus.dk), chief scientist for the EAGER 2011 cruise. Short reports from the cruise can be found on the website of the Swedish Polar research Secretariat (link to http://www.polar.se/expeditioner/swedarctic2011/rapport/eager.html).

For further information please contact Christian Marcussen ( (umtill Sept. 9, 2011) after that date ), chief scientist for the EAGER 2011 cruise. Short reports from the cruise can be found on the website of the Swedish Polar research Secretariat

Den svenske isbryder Oden
The Swedish icebreaker Oden Oden - Photo: Thomas Funck, GEUS

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Last modified : March 26, 2012
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