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Deep (∼2000m) observations near the Sigsbee escarpment in the Gulf of Mexico show short-period (approximately 5–12days) energetic currents due to topographic Rossby waves (TRW’s). We suggest that the phenomenon is due to the focusing and accumulation of TRW energy by the slopes coupled with a bend in isobaths, in a topographic caustic (topocaustic). The idea draws on a simple mathematical equivalence...
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