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Full-Water Column Current Observations in the Western Gulf of Mexico

Autor U. S. Department of the Interior
en Limba Engleză Paperback
Fourteen months of direct surface to bottom current measurements off the coast of Tamaulipas, Mexico, in the NW Gulf of Mexico during 2004 and 2005 capture the evolution of currents as several oncoming warm Loop Current eddies and cyclonic eddies reach the mooring array. Results show that current variability is mostly associated with these eddies as well as strong wind events (e.g. Hurricane Emily and Northern winds). In all five moorings, current standard deviations are larger than the mean. Interestingly, the most intense surface currents are found on the southernmost mooring (MMS5) at 2000 m depth and not at the shelf break. In general, current fluctuations are typically 20-40 cm/s at the surface and decrease with depth. In the upper layers, energy increases offshore, with a clear influence from eddies, to a depth of about 800 m. Further at depth, a weaker but steady southward flow appears to be locked near the slope in the form of a persistent current over the 2000 m isobath. Although low frequency fluctuations (periods > 3 days) are, as could be expected, more energetic than high frequency fluctuations, near-inertial and supra-inertial fluctuations are ubiquitous in all moorings and at all depths. In fact, it is found that at depths close to 1200 m there is a relative maxima in the high frequency contribution to total fluctuating energy. Whether this feature is produced by eddies focusing wind generated near surface inertial oscillations or it is produced by some sort of wave activity related to eddy instabilities or eddy-topography interactions processes is still to be resolved.
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Specificații

ISBN-13: 9781505484519
ISBN-10: 1505484510
Pagini: 128
Dimensiuni: 216 x 279 x 7 mm
Greutate: 0.31 kg
Editura: CREATESPACE