EGU 2012, Kristine S. Madsen, [email protected]High resolution modelling of the decreasing Arctic sea ice Kristine S. Madsen, T.A.S. Rasmussen, J. Blüthgen and M.H. Ribergaard Polar Oceanography, Danish Meteorological Institute Sea ice volume, 10 13 m 3 Oil drift 17 days after initial spill
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EGU 2012, Kristine S. Madsen, [email protected] High resolution modelling of the decreasing Arctic sea ice Kristine S. Madsen, T.A.S. Rasmussen, J. Blüthgen and.
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High resolution modelling of the decreasing Arctic sea ice
Kristine S. Madsen, T.A.S. Rasmussen, J. Blüthgen and M.H. RibergaardPolar Oceanography, Danish Meteorological Institute
Sea ice volume, 1013 m3 Oil drift 17 days after initial spill
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Overview
Model introduction
Sea ice changes– Extend– Volume– Ocean surface temperature
Oil drift modelling– Surface spill– Deep spill– Importance of sea ice
• Purposes: oil combating, “find the sinner”, drifting vessel, man overboard
• Particle model• Passive advection with ocean current• … and additional surface wind drift (3%)• Wind speed is scaled inverse linear with sea ice concentration.• Future work: Ocean speed is scaled inverse linear with sea ice
concentration towards ice velocity.• Buoyant rising (or sinking)• Downward mixing by wind waves (scaled by wind speed + random
distribution)• Turbulent spreading (random walk scaled by current speed)• Oil weathering• 8 pre-defined oil-types - based on fractions of 8 hydrocarbons• Instantaneous or continuous oil spill at any depth• Runs operationally, 15 minutes response 24-7
http://www.itopf.com
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Example of oil driftImaginary surface spill on
August 1-10 2003 south-east of Greenland
2 deg ~200 km
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Oil drift in sea ice affected areas
• Wind drag limited (already included in model)• Oil will partly drift with the ice• Oil will be trapped in pockets under the ice or freeze into
the ice – reducing weathering
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Thank you!
Sea ice volume, 1013 m3 Oil drift 17 days after initial spill