Annual number of observed oil slicks from aerial surveillance

Figure Created 12 Nov 2009 Published 12 Nov 2009 Last modified 29 Nov 2012
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Because of shortcomings in the methodology, it is likey that the numbers are only order of magntide estimates of the actual number of slicks



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There was a change in the methodology used in the North Sea between 1996 and 1997, probably accounting for the increased number of observed slicks between 1996 and 1997.

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