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Lagrangian velocity spectra at 700 m in the western North Atlantic

TitleLagrangian velocity spectra at 700 m in the western North Atlantic
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication1996
AuthorsRupolo, V., Hua B.L., Provenzale A., and Artale V.
JournalJournal of Physical Oceanography
Volume26
Pagination1591-1607
Keywords(Northwest), Atlantic, dispersion, Lagrangian current measurement, velocity spectra
Abstract

Pending an appropriate scaling of each trajectory by its Lagrangian integral timescale TL, there exists a generic shape of the Lagrangian frequency spectrum for the trajectories of the 700-m dataset in western North Atlantic, which are stationary on the timescale of 200 days. The generic spectral shape contains a plateau at the lowest frequencies extending up to ν0 ∼ (30TL)-1, a power-law behavior with an intermediate spectral slope α = 0.25 between ν0 and ν1 ∼ (3 ∼ 4TL)-1, and a steeper slope n ≥ 3 at larger frequencies. Such a steep slope at large frequencies implies that most of Lagrangian dispersion can be ascribed to low and intermediate frequency motions. The variance of the Lagrangian acceleration computed from such a spectrum is finite, indicating continuous particle accelerations and supporting a truly Lagrangian behavior of the 700-m floats. The existence of an intermediate power-law behavior in the spectrum can be linked with the trapping of some trajectories by persistent energetic structures and is associated with a tendency for anomalous diffusion lasting up to 10TL. The authors also introduce an alternative method for computing TL from a yardstick measure of Lagrangian decorrelation length from each individual trajectory.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0030429904&doi=10.1175%2f1520-0485%281996%29026%3c1591%3aLVSAMI%3e2.0.CO%3b2&partnerID=40&md5=91e99736d51e0918ec3c75b7f2551281
DOI10.1175/1520-0485(1996)026<1591:LVSAMI>2.0.CO;2
Citation KeyRupolo19961591