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Free Content Lagrangian properties of eddy fields in the northern North Atlantic as deduced from satellite-tracked buoys

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One hundred and thirteen satellite-tracked buoys have been used during their first 5 months after deployment in order to calculate Lagrangian statistics of the eddy field in the northern North Atlantic between Newfoundland and the Canary basin. r.m.s. velocities are isotropic and increase from southeast to northwest. Lagrangian integral time scales, derived both from correlation function and from dispersion, are slightly anisotropic and decrease from the subtropics toward the North Atlantic Current. Time scale is inversely proportional to the r.m.s. velocity of the eddies. Eddy length scale is approximately constant in the North Atlantic. Dispersion is in good agreement with Taylor's hypothesis, following a t2-law during the first day after release and a linear increase with time during days 10 to 60.

Eddy diffusivity increases from 30N to 50N by a factor of about 4 and is linearly dependent on the r.m.s. velocity. The energy containing frequency band of the eddies shifts toward higher frequencies in the northern part of the Atlantic. Beyond the cut-off frequency of the eddies the spectral slope follows a -2 or -3 power law.

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Document Type: Research Article

Publication date: May 1, 1987

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  • The Journal of Marine Research, one of the oldest journals in American marine science, publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. Biological studies involving coupling between ecological and physical processes are preferred over those that report systematics. The editors strive always to serve authors and readers in the academic oceanographic community by publishing papers vital to the marine research in the long and rich tradition of the Sears Foundation for Marine Research. We welcome you to the Journal of Marine Research.
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