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Time scales and structure of topographic Rossby waves and meanders in the deep Gulf Stream

Authors: Johns, W. E.; Watts, D. R.

Source: Journal of Marine Research, Volume 44, Number 2, May 1986 , pp. 267-290(24)

Publisher: Sears Foundation for Marine Research

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Abstract:

During July–November 1982, current and temperature records were collected from six current meters spanning the lower 2000 m of the water column on two moorings in the Gulf Stream northeast of Cape Hatteras, N.C. Frequency domain EOF analysis of the velocity cross-spectra reveals that there are two kinematically distinct wave processes present in the subinertial range, identifiable as topographic Rossby wave and meander-associated motions, which are energetically dominant at periods longer than and shorter than 14 days, respectively.

Simultaneous thermocline depth measurements obtained using inverted echo sounders show that the low-frequency topographic Rossby wave motions are uncoupled with near-surface displacements of the Gulf Stream path, but that cross-stream velocity fluctuations in the 14-day and 5-day period bands are associated with vertically coherent meanders of the Gulf Stream temperature front.

Document Type: Research Article

DOI: http://dx.doi.org/10.1357/002224086788405356

Publication date: May 1, 1986

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