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Topocaustics
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DOI：10.1016/j.ocemod.2009.05.006.png)
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Deep (similar to 2000 m) observations near the Sigsbee escarpment in the Gulf of Mexico show short-period (approximately 5-12 days) 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 between the propagation of internal waves and of TRW's. Topocaustics occur near regions of maximum N-T = N vertical bar del h vertical bar (N = Brunt-Vaisala frequency: h = water depth). Because of the one-sided propagation property of TRW's, energy also tends to accumulate at the western end of closed contours of N-T. The process is demonstrated here using a nonlinear primitive-equation numerical model with idealized bathymetry and forcing. A Gulf of Mexico simulation initialized with a data-assimilated analysis covering the period of the Sigsbee observation is then conducted. The mooring is near a localized maximum N-T, and Intrinsic Mode Functions confirm the existence of energetic bursts of short-period deep-current events. The strong currents are locally forced from above, either by an extended Loop Current or a warm ring. (C) 2009 Elsevier Ltd. All Fights reserved.
Keyword:
Topocaustics
Topographic Rossby waves
Internal waves
Deep currents
Gulf of Mexico
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2.9
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2.2K
被引数:
5.4K
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