Internal Tides

As published in GRL, 2009.  

   • Editor's highlight

  On our 2003 Norwegian Sea survey, we observed coherent packages of reflections that clearly crossed isotherms, sometimes over several ˚C.   We hypothesize that these reflections come from M2 internal tide beams, similar to those imaged in Schlieren images from tank experiments.  This hypothesis is supported by the shape of the inclined reflections; they closely mimic the expected shape of the m2 internal tide:

(Click on the image to see a larger version.)

   We observed particularly strong "beams" on Line 40, in an area where the continental slope has a large, planar area inclined at an angle very close to the M2 internal tide characteristic:

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Note the remarkable similarity between the image above and one produced in the laboratory by Dauxois and Mercier:

(Click on the image to see a larger version.)

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